Hot exhaust gases can leak into the cooling system, or coolant can leak into the cylinders and be burned off as steam, either way, the end result is an overheating engine. If the car is driven while overheating, it can also result in the alloy cylinder head warping, or steam damaging the catalytic converter, adding significantly to the cost of repair. This loss of compression results in a rough running engine and a notable reduction in engine power.
This sort of failure typically is accompanied by a sound like an exhaust leak. One of the most famous signs of head gasket failure is the milky sludge on the underside of the oil filler cap or the dipstick, sometimes jokingly called a "milkshake". This is caused by coolant getting into the oil, and vice versa. Although not conclusive proof of head gasket failure this is generally a good indicator and is a sure sign your engine needs to come apart to find the source of contamination.
Repair requires at least an engine oil flush as well as a replacement oil filter, and often times complete disassembly of the bottom end of the engine to ensure the bearings aren't damaged and clear out all contaminated oil. A faulty head gasket most often results in billowing clouds of sweet-smelling white smoke coming from the exhaust. Thie smoke is caused by antifreeze leaking past the gasket and into the cylinders, where it is turned to steam as part of the combustion process. Less common, but still possible, is a leak from an oil passage to the cylinder, which would cause blueish smoke.
Either of these types of gasket failure will also allow combustion pressure into the cooling system or oil breather system. If a radiator hose suddenly blows off its water outlet, or the dipstick won't stay put, this could be the reason.
If a head gasket has failed between the water or oil passage and the outside of the engine, the result can be a simple coolant or oil leak.
This is the least dire version of a blown head gasket, but still serious. An external leak may not manifest itself as an immediate problem other than causing a mess , but if the coolant level is allowed to drop too far, it can lead to serious engine issues. The other issue is that leaking oil could get on the hot exhaust leading to acrid smoke, and possibly fire.
A few dollars of prevention is much better than the several thousand dollar cure when it comes to head gaskets. The replacement head gasket itself is not expensive, but the repair is very labor intensive, which significantly increases the cost of repair, especially on modern cars. Overheating in the engine of your car will lead to a loss of compression, the mixing of oil, water, coolant as well as a reduction in lubrication.
The head gasket is a very complex piece of equipment and so a variety of materials are needed to build it. It must be able to withstand and function normally at extreme temperatures and pressure. It also needs to be resistant to all of the chemicals and oils which rush around your car engine. As a result, each gasket from one car to the next is different as the demands of each engine are unique.
Car manufacturers like Ford, Vauxhall and BMW spend millions of pounds every year in the research and development of head gaskets to help manage the pressure and cooling of engines. Replace a damaged head gasket. Most drivers know what a head gasket is, but many are unsure what causes a blown head gasket. Fortunately, there are a few blown head gasket symptoms you can look for to find out whether yours needs repair.
Meaning you can have any problems seen to before it develops into a serious issue. A lot of white smoke is being emitted from the exhaust or liquid is dripping from the same place. Head gasket diagnostic services. Accessing the gasket can be quite a lengthy procedure as it involves removing a large set of engine components.
The exact process for head gasket removal varies depending on your car model. To gain access to the gasket the battery and engine is removed, with the engine oil and coolant also drained. Once you have determined the cause you will be able to make an educated decision on what the next steps should be. I have a mazda mpv losing coolant but no signs of a leak was running hot till I changed thermostat and radiator cap now just losing coolant will empty entire reservoir within 2 miles.
In general, as long as the vehicle will not lose more than 1 quart of water during the 50 minute idle then you should have no problem sealing it. The fact that your reservoir is emptying within a 2 mile drive leads us to believe that it may lose more than 1 quart during the recommended 50 minute idle. You may test it but it sounds like the Mazda may need a hard part repair. After a radiator replacement my Volvo was blowing coolant vapor from the exhaust and there was coolant in the motor oil.
I used a half bottle of Blue Devil yellow label, changing the motor oil before and after, and the white smoke has stopped but there is still some coolant leaking into the oil. Should I attempt a second treatment? Yes, we recommend running the exact same process, including changing oil before and after, a 2nd time. This should take care of the leak that remains. Radiator cap was pressure tested and no leaks were found.
Replaced thermostat, but still having an issue. Car will sit at idle for 2hrs and temperature stays normal. After driving for about an hour it runs hot. No white smoke from tailpipes. No leaks. Fans are working properly. Any suggestions, and should I this product?
There are a number of different things that could cause a vehicle to overheat. You may want to have your Dodge further diagnosed by a professional so that you are able to pinpoint the cause of it overheating. Once you are able to do so, you will have a better idea on what your options are. When I was getting a different repair, the mechanic informed me that the head gasket in my 07 Subaru Legacy was leaking.
BlueDevil is more effective on leaks that are caught in the early stages as opposed to a leak that has become extreme. We would recommend the use of our product for your Subaru. Keep in mind, you will only need to add 16 ounces into your cooling system.
I changed the radiator because I saw visible cracks in the top. Problem solved for about one year. I recently drove about 4 hours non-stop on a hot Florida summer day, on the return trip the car overheated and stalled hot.
Took it to a mechanic, they changed all spark plugs and coils saying that was the cause. Problem not solved. Brought it back, they changed out the EGR valve and solenoid. Still not solved, actually worse rough idle. After these repairs the car overheated within about 30 minutes of driving and overheated within 20min after topping off coolant.
I removed spark plugs and discovered green coolant on the plugs and coolant on the oil dipstick. I have not driven the car since. I do not know if there is white smoke out of the exhaust, however, there was white vapor coming out of the oil cap when I removed it. Is your product indicated here?
Is there further investigation I should do? If your product is indicated, should I change oil before and or after using your product? Anything else I should consider? Once because a water pump blew, and the second time the radiator reservoir would become extremely hot and cause the engine to stop. I flushed the system, replaced the pump, and even replaced the thermostat and topped it with coolant.
I also notice some tiny spits of water coming from the engine, possibly the head gasket. As long as your vehicle will be able to idle for a full 50 minute period without stalling out or overheating then the BlueDevil Head Gasket Sealer would be a great solution for repairing your Acura.
If my fan is running on low speed do I need to fix that first before using your sealant that I bought? I have a 02 Jeep Cherokee 8 cylinder. Yes, you should address the defective fan issue first. I have a Hyundai Galloper engine Mitsubishi 2.
Replaced head years ago. Then replaced head gasket about 1 year ago faulty work installing new one? All OK for many months. Then Turbo went out.
Replaced about 3 months ago. All of a sudden this week , car overheats, water goes from radiator to reservoir.
Could your product help? To give yourself the best overall chance of BlueDevil working successfully in addition to the directions, you should remove the spark plug from the cylinder with the leak.
I have a Oldsmobile alero an it was overheating so I got new resevor thermostat an flushed the radiator and it was still overheating now I got water an white smoke coming out of my tail pipe an car wanna turn off. I was using water not antifreeze because it would just spill out so my oil is watery not milky please help me What should I do.. As long as your vehicle would be able to idle for a full 50 minute period then we would recommend using our product, the BlueDevil Head Gasket Sealer.
You will want to change your oil before and after the BlueDevil process. So I just bought a ford probe and have been driving it for a week, no overheating or coolant loss. But a very small amount of smoke coming from the middle of the engine.
Kept driving it. Then the other morning I drove it for 10 minutes not long enough to even warm up and it ran fine, got home, turned the car off and heard a light trickle and looked under my car to see liquid dripping. It dripped down and across the rest of my parking spot. It was neon green. But others say head gasket. Do you have an opinion? Would it hurt to use the blue devil stuff if its not a badbhead?
We recommend that you check all of the hoses and their connections to make sure the leak is not coming from a loose hose. If you do confirm that the head gasket is leaking then we definitely recommend using the BlueDevil Head Gasket Sealer. I have a Duramax diesel diagnosed with head gasket problems by 2 different shops. I loose a little coolant but no overheating. You will not always experience the overheating symptom when you have a blown or leaking head gasket.
Based on the fact that you are loosing coolant, our guess is that you are in the early stages of a blown head gasket. I just bought a 98 buick century with the 3. I have a slight suspicion there could possibly be oil getting into the antifreeze or vise versa. Also have a Heater core leak. Will hurt to still run a bottle of your product and if so which one? Unfortunately, the products that we manufacture for head gasket leaks will not work when oil is being introduced into the cooling system.
At this point we recommend that you confirm whether or not oil is present in the cooling system. If you find out that it is not and you only have coolant entering the oil then BlueDevil will be a solution for you. Once you have had a chance to look further into your issue at hand please contact our tech support team at so that we may discuss a possible solution.
There is ne white Cloud in my oil and there is no fluid on the ground under my car. Would this be from the Head Gasket? There can be a number of reasons that your vehicle is overheating. We have previously posted an article about this specifically. I have only babbles in the expansion tank of my yards verse diesel no overheating or smokes or even no leak in the coolant. Please contact us at so that we may discuss your symptoms in more detail. We will be able to make possible suggestions to you so that you have success with our product.
I have a Ford Explorer I just replaced all spark plugs and wires and radiator.. Lots of white smoke from tail pipe and codes are reading cylinder 4 misfire still after replacing plugs and wire….
Not over heating and no leaks should I use sealant? It sounds like you are having a few different symptoms of possible engine problems. You may want to have a certified mechanic take a look at the car to diagnose the problem or problems at hand.
Once you have a diagnosis you will be able to better decide what some of your options are to get the vehicle running smoothly. I have a 98 buick leaking coolant, and over heating at first I thought it was the radiator until I noticed the leak close to the top of the engine by the cap for the oil. Its leaking at an alarming rate now. All the hoses seems to be good.
Iv only just head about a head gasket and seen that the problems are very similar. Please Help. I have a Buick regal car overheated because of lack of coolant filled it and car did not overheat but is still losing cool and it drips out on the front passenger side and now the heat is not working it blows out cold air coolant is not milky like and no white smoke but will a blown head gasket cause this and can I use the gasket sealer.
This should have no problem stopping your coolant loss. The symptoms you have described are very common in the early stages of a blown head gasket. I have a pontiac grand am 3. Yes, BlueDevil has worked in situations similar to what you are experiencing with your Pontiac. You will definitely need to flush the cooling system prior to starting the process.
For best results, you should also change the engine oil before and after the BlueDevil process. As I said the car starts but does not hold the water or coolant. It just spits it out the tail pipes. The vehicle must be able to idle for a full 50 minutes without stalling out or overheating in order for this to be able to work.
The vehicle also should not be losing more than about 1 quart of water during the 50 minute run or you will be losing the product to quickly.
Based on your description, it sounds like you may have a leak that is too extreme. I have a Volvo that has had an oil leak, i have just been watching it by checking the oil levels. Today i noticed white milky in the oil. I have not been losing much coolant, just oil and the car runs great. Is your product a good choice at this point to use? It sounds like you may have a couple of different leaks going on with the vehicle. The coolant getting into the oil may be a head gasket leak.
For this, you may use our BlueDevil Head Gasket Sealer; you will want to change the oil before and after the process to ensure best results. I have an 03 jag s- type 4. If your car is losing more than that then you may need to look at getting the hard part repair. My 91 Silverado has all the symptoms of a blown head gasket white smoke exhaust, bubbles in reservoir, water in oil, overheating but overnight my coolant system is maintaining pressure.
If I actually had a blown head gasket, would it not lose pressure? Possibly something more serious like cracked head? In some instances the cooling system will still maintain pressure even if you have a blown head gasket; it is also a possibility that the head is either warped or cracked.
Based on your symptoms we recommend that you use the BlueDevil Head Gasket Sealer to help repair your vehicle. I just got an oil change and they said my oil was leaking behind my engine and that I needed a new head gasket. Can I use this sealer to fix the problem? Unfortunately, we do not manufacture a product that is intended to stop leaking oil from in or around the head gasket. We hope you are able to find an easy solution. I have a Nissan Altima I opened the hood a couple days ago realized I was low on oil and the coolant overflow tank was almost empty.
The next day white steam or smoke started to come out of my exhaust pipe. I checked oil stick and oil cap no sign of a coffee cream milky substance. My check engine light comes on and goes off every other month and my car has never overheated. Could this still be a problem with my head gaskets. Yes, it sounds like you do have a head gasket issue.
You will want to change the oil before and after the BlueDevil process to ensure best results. I have a Honda Accord 2. My coolant leaks out only into the coolant overflow.
Seems to be pressure from the cylinder coming into my coolant and forcing it out to the overflow. I have all new; radiator, all hoses, and radiator cap. Will Blue Devil work for me and how?
To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak. After witnessing white smoke shooting from the coolant reservoir, I filled up on coolant and drove it to get some more but had to stop every 20 yards because it would overheat.
When i got home, the coolant was at the same level. I hear bubbling from within the radiator and leaking liquid from both sides of it. If there was white smoke coming out of my exhaust, I didnt notice.
Im hopeing its something that i can fix like a thermostat or radiator or even the gasket and not a crack cylinder head. Estevan, Thanks for your question about your Wrangler. It is possible that you simply have a low coolant level and a lot of air pockets in your cooling system.
If you can, try starting your jeep and letting it idle on a hill so the radiator is at the highest point. Leave the radiator cap off until your jeep warms up and add coolant as the air pockets bubble out.
The symptoms you described do sound like you have a blown head gasket. If your vehicle is overheating and the coolant reservoir and radiator are full, that is usually a pretty good indication of a blow head gasket.
You can go to your local auto parts store and pick up a blown head gasket tester. These tester will test for the presence of exhaust gases in your coolant, and will give you a positive indication of a blow head gasket. If you do have a blown head gasket, you can use BlueDevil Head Gasket Sealer to seal your head gasket leak and get your jeep back on the road.
You can still use BlueDevil in cold climates. If you do it when the outside temperature is below freezing you will want to be sure to drain your cooling system, after the BlueDevil process is complete, and refill with antifreeze. About 2 weeks ago I got 2 new front tires once I got the car back the check engine light was on for 2 days I thought it was jus because they lefted it up wrong or something cus it went away.
Then about 4 days ago when I would come to a full stop and then press the gas the car would rrrrr until I slightly yake my foot off the gas then press again then it would go. Then yesterday the light came on for low coolant but stayed on for a minute and went off. Can you tell me whats going on with my car? Thanks for your question about your Pontiac Grand Prix.
The first step in diagnosing the problem would be to have the check engine light read so you can see what your car thinks the problem is. The low coolant light flashing on probably indicates that your coolant level is getting low and as it sloshes around while you are driving and uncovered the level sensor.
If you pop your hood you can check for a low coolant level in the coolant overflow bottle. The bottle is in the back, passenger side of your engine compartment near the alternator. If you have any further questions you can leave a comment on the bottom of that article.
I have a 96 Ford Taurus with the 3. I see no coolant leaking anywhere. Would your head gasket sealer product work, and if so, which one should I use. I do need to be careful and not remove the thermostat again as I just had the bolt hole re-screwed due to stripping. Thanks in advance! Based on your symptoms, you should have no problem sealing it with this product. Why does the radiator on my Toyota Truck, 5 speed manual tranny, 22 RE motor have some oil in it.
No water or milky oil when I changed the oil, no other problems with the truck, just some oil in my radiator……. The most likely cause is due to your intake manifold leaking. Unfortunately, we do not manufacture any products that are intended to stop oil from entering the cooling system. Just brought a Hyundai Tuscon from a private owner. My girlfriend was on the way home and the vehicle overheated and went dead on her and there was white smoke also. This was no coolant or water in radiator so I waited for it to cool down and put some in there when I did there was a leak coming from the bottom of the vehicle and it would not crank.
I jumped it and it cranked up and on the way home the temperature never went back up it stayed normal but the engine was making a funny sound it sounded like a diesel truck now.
Is this a head gasket issue or something wrong with a hose or connection? It sounds like it is a head gasket leak but now that the vehicle overheated to that degree you may also be dealing with some additional issues as well.
It sounds like you are losing coolant fairly quickly considering the cooling system was empty when you checked. You may be able to use the BlueDevil Head Gasket Sealer but we first recommend you take the Hyundai into a specialist to have it further diagnosed.
You may need to address some of the other issues prior to being able to use the BlueDevil. In order to use the product the vehicle should be able to idle for a full 50 minute period without stalling out or overheating. I just noticed the coffee look in my oil. The 06 Saturn Vue 4cyc never ran hot. Sooo I got the Blur Devil oil thermostat n oil filter. Its jan will correct it or put a bandaid on it and buy another car asap. I was on my way home the other day and I heard a loud pop come from my engine area.
I had replaced the radiator cap the day before. I noticed my car acura legend ls with a 3. L V6 started to produce steam from the engine bay area and realized it had come from the radiator cap.
The overflow tank is still full. Something else I had noticed was the car was idling high in park. Is it ok to put the pour n go head gasket sealer as a preventative measure? Also it is cold enough to get confused between the cold and actual white steam from the exhaust. So I am unsure if it is or not. We recommend taking the Acura into a certified mechanic to have the vehicle further diagnosed prior to adding anything into your cooling system.
I have a mercury villager I know the flex pipe has a whole in it so I will be taking it to the shopto be welded but there is still a cloud of white smoke coming from the whole in the flex pipe so could that be a blown head gasket? Thanks for your question about your Mercury Villager. It does sound like you have a blown head gasket. Another very important question about the procedure — once the initial 50 minute idling is complete, would it be harmful to let the engine cool down and then idle again for repeated 50 minute procedure with the Blue Devil sealant unflushed?
After the 50 minute idle is complete you should allow the vehicle to cool down for at least 2 hours. Once it has cooled, it is not necessary to redo another 50 minute idle, the system should be sealed at that point.
The only risk there would be to leaving BlueDevil and water in your system overnight would be if you live in a cold climate where temperatures will drop below freezing. If you are in a colder climate we advise that you drain the system down to add some antifreeze. One more question — my car Jeep Grand Cherokee diesel, European has coolant expansion tank and also a radiator cap — which one should I use for pouring the BlueDevil in?
After the 50 minute idle and cool down the BlueDevil process is complete and has created a permanent seal. It does not continue to have any sealing properties after that point. The engine needs to reach about degrees. If it never got that hot then the chemical is still active and you can run it again, you may want to try running it longer so that it is able to achieve at least degrees.
Any suggestions on what that could be? Usually the noise is caused by one of two things, low oil pressure or a worn part. The first thing you should check is the engine oil level; if the level is low you will sometimes hear a clicking or tapping noise. If the oil level is low be sure to refill it to the proper level and you also may want to consider using the BlueDevil Oil Stop Leak as it is probably low due to a leak.
When I drive it makes a sound sounding something like a remote control airplane especially when I pick up speed it gets louder. Could it be a gasket problem as said? Thanks for your question about your Malibu! Depending on what kind of car you have, you may experience some, all, or just one of those symptoms.
Most auto parts stores sell a test kit where you can test your coolant for exhaust gas chemicals. The only way exhaust gas can get into your coolant is through a blown head gasket, so that could tell you for sure. As for the noises you mentioned, usually blown head gaskets do not cause any strange noises, just the smoking or overheating. The noises you mentioned that change with speed sound like it may actually be a wheel bearing or CV joint problem.
If you have any more questions please leave us a comment on the bottom of one of those articles and we will get back to you. My Nissan Pick-up is overheating we changed the thermostat still overheating. Think blue devil pro will help? I have a 99 ford ranger with a 4. On cold mornings I notice white smoke coming from the exhaust. Have a milky like substance around the oil cap.
Does this sound like a blown head gasket? If the cylinder head is warped will ur product seal it? Yes, this does sound like a blown head gasket. All of the symptoms you have described are very common when the head gasket is blown.
We recommend using the BlueDevil Head Gasket Sealer; it will also work if the head is warped or cracked. You may want to have a certified mechanic take a look at it to diagnose exactly what is going on with the vehicle. Once a diagnosis is made you will be better able to determine what you need and should do. When I changed the oil I looked for antifreeze or milky oil.
The oil was old but I saw no signs of antifreeze in it. The oil cap did have that milky paste at the bottom of it but I was told thats just condensation and its normal. I added a small bottle of another liquid stop leak to the coolant and the leaking stopped, no more wet spots appearing on the driveway overnight, but now the overflow bubbles and foams up. No smoke, no overheating actually runs cooler than it should , heat works great, no visible oil that I saw in antifreeze, just lots of foam in reservoir.
A mechanic said the antifreeze is contaminated and that the hoses might break if I flush it with the machine, but again he saw no antifreeze in the oil. He also said it passed a pressure test and that it might be a timing cover or head gasket but no way to tell for sure unless they take it apart.
My car overheating still after changing the water pump radiator coolant resivoir hoses and everything…. There could be a number of reasons that your car is overheating. I have noticed a two or three drop leak of coolant at the bottom of my engine, and my car wont blow hot air. I have a 8 Cyl so when I use your sealant, after i remove the thermostat and flush it, do i replace the thermostat or just put the old one back on?
First of all, thank you for your interest in our product. After the 50 minute idle is complete you should allow the vehicle to cool down at least 2 hours. Once it has cooled you may then re-install the old thermostat. I have a Honda CVR and its been leaking oil. We thought it was my husbands car. I just found out the other day it was mine.
There is oil around the valve cover gasket area. While driving it last night it lost power and I had to pull over and have it towed. Some say its valve cover gasket and some say its a blown head gasket. So am I looking at a huge amount of money for a blown head gasket or the smaller valve cover gasket. Oh and no white smoke. I just smelled a slight burning smell like rubber. Thanks for any help you may have. It is a possibility that the valve cover leak has caused oil to leak down onto the spark plugs or spark plug wires.
If that is the case it may cause a misfire which would result in a loss of power. We recommend taking a look at the spark plug and spark plug wires to see if you notice oil anywhere.
If so, you may clean the area and potentially change the spark plugs. Depending on the severity of the leak you could try to use the BlueDevil Oil Stop Leak to help stop the valve cover leaks; keep in mind you will want to address the spark plugs prior to doing so. You should notice results after about miles of driving with BlueDevil in the system.
I got a guy to look at it and he said it was the timing chain …another guy said it was in the ignition system …. I have a 97 accord that on about every other startup, goes through a second very rough idle phase.
I give it gas and it tapers off once I get it up to around 3, rpms. I was told this is because my coolant is leaking into the engine. They said they would have gone in to fix it, but if a part of my engine was warped then they could not put it back together and my car would be done for.
With the amount of times this car has overheated, I did not want to try that. Does this sound like the head gasket or something worse, and has it gotten too bad to where this sea lent may not be enough? Thank you. Please contact our tech support team at We would like to discuss your vehicle in a little more detail so that we are able to better determine whether or not BlueDevil would be a possible solution.
The symptoms you have described are often present when dealing with a blown head gasket. The reason you will sometimes notice a loss of power is because of antifreeze leaking onto the spark plugs or spark plug wires causing a misfire. Feel free to contact our tech support team at with any questions along the way. When the car is started, a little white smoke comes out, but not much.
What will normally be the first sign of a blown head gasket? We received your blog comment in regards to the possible use of our product. I did have white smoke bellowing and a leak under the transmition but after using your product, theres no smoke or transmition leak. Thank you for asking about your Volvo. Based on your description, you may be losing coolant a little too quickly for the BlueDevil to be successful. Are you noticing any other symptoms such as vehicle performance or lack of engine power?
Please contact our technical support line at for further assistance. The water pump within a three year interval and the radiator within a three year interval. Now it looks like the radiator has started leaking again. The engine oil does not look milky, nor does the truck burp out white smoke after startup.
I do have what sounds like an exhaust leak on the passenger side but after changing exhaust manifold gaskets and y-pipe donuts it still has the exhaust leak. Does this sound like a possible head gasket issue? Yes, it definitely sounds like a possible head gasket issue. You may want to have the vehicle looked at by a certified mechanic to confirm the diagnosis is correct.
Hi I have a 99 Mercury Cougar, and it has been giving me problems with overheating. It seems to have a radiator leak and what I would assume is a leak in the head gaskets. The oil is sort of milky or clearish. It has a 2. Thank you very much. For best results, you should change the oil before and after the BlueDevil process. Once BlueDevil is able to seal the head gasket it creates a permanent seal.
We manufacture 2 different Head Gasket Sealers; you may use either one. The product with the yellow label will give you best overall results as long as you can remove the thermostat and flush the system prior to use.
With the use of either product, be sure to follow the guidelines for the proper amount to use. Based on your capacity, you will be using 16 ounces either way. I have white smoke coming from my tail pipe with drops of water coming out of it. I have a funny smell coming through my heater vent, no over heating.
Idk how to tell if your oil is milky. Please help!! The oil is often described as looking like coffee with creamer if the coolant has leaked into it. I have a Mazda 3 with K on it. I had odd issues throughout the winter with no heat in the cabin at idle. Occasionally the gauge would peg briefly, but the car was never really running hot. I have changed the t-stat.
Needs coolant occasionally, but none in the oil. That being said I recently noticed a rough idle during cold start for about 5 seconds or so. I just pulled the plugs and found dampness coolant in 2 of the cylinders next to each other, that would be the cause of the rough idle until it burns off.
So I am assuming I have a leaky head gasket. Will this stuff permanently seal it off? Coolant leaking onto your spark plugs can cause a rough idle. Based on your description it sounds like you are experiencing signs of a blown head gasket. Replaced water pump and never overheated again. Stuck in traffic engine did not overheat but Radiator blew out with a 7 inch crack across the top in the plastic. Any ideas? It sounds like your vehicle may be pushing combustion gases into your cooling system and thus causing an extreme amount of pressure.
If it turns out they are present then you should contact us at and we will be able to help you out.
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