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Might have a blown intake gasket or head gasket

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Old 02-14-2018, 04:06 AM
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Might have a blown intake gasket or head gasket

Hello, my name is Sabdiel and I am new to the forum but recently I had a problem with my Truck. It is a 99í Ford F150 XL RWD with the 4.2L V6 it has about 228k miles. So I was on my way to drop off my gf at her house and while I was driving I noticed no hot air was coming out and I thought that was very weird. It was not until I was halfway there once I noticed my coolant temperature was through the roof. I decided to take the nearest exit. As I stopped at the red light my engine completely shut off. I had to push it to a parking lot and call someone to pick me up.

After this had happened I went back to the truck and opened the hood. First thing I checked was my coolant level, there wasnít any coolant in the reservoir. I went to the nearest auto parts store and bought some coolant to put in. I then filled the truck back up with coolant and turned it on, everything seemed fine now so I decided to take it back home, same thing. My temperature was rising fast so I stopped on the side of the road and opened my hood and I saw coolant just spilling out, I tried to see if any hose was lose, everything seemed to be correctly in place, I did end up making it home.

The next day I opened my hood again to double check and nothing was out of place, everything seemed fine. So I started it back up and made sure to fill the coolant reservoir at the correct level and took it for a test drive. It now held it's temperature weirdly enough. I got on highway and nothing, no signs of overheating. However I did notice white smoke. It wasnít much but it was noticeable. I did some research and have seen that intake gaskets were a big problem for these 4.2s. I also checked my oil cap and it shows some milky type of oil. I checked my oil level and it was low. It had been about 2,500 miles since I did the last oil change and it lost about 2 quarts of oil. I really want to keep her going but I donít want to spend more than she cost. Any Input will help thanks.


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Old 02-14-2018, 07:36 AM
formerjeepguy formerjeepguy is offline
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You didn't mention anything about the oil looking unusual so can we assume that the oil looks normal and not milky? Milky oil is usually a dead give away for a head gasket where coolant gets into the oil. It also raises the oil (milk) level so if you do have a bad head gasket then it is not allowing coolant into the oil.

Overheating can cause warpage so stop driving and overheating it until you fix it.

The white smoke does mean water in the combustion. Pull and examine the plugs to determine which bank and cylinders are effected. Stop running it as you are risking hydrolock which will destroy the engine.

It's probably an intake gasket. Pull the intake and look for the leak around the cylinders with the extra clean plugs. If you can find an obvious leak then you are good to go replacing the gaskets after cleaning it all up.

Maybe someone else can chime in but I may have read that some of these V6 have a manifold design flaw and the whole manifold needs replacement.
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Old 02-14-2018, 01:24 PM
alloro alloro is offline
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The overheating can be due to the thermostat sticking closed. Then since it overheats the coolant expands out of the overflow. Since the oil is milky that means coolant is getting into the crankcase, which is more typical of an intake gasket issue than a head gasket issue. At this point a compression or leak down test is necessary to determine if there is a blown head gasket. If the test shows there is not, then a new intake gasket and t-stat is probably in order.
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Old 02-14-2018, 07:33 PM
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Thanks for the replies, I did a coolant block test to see if any exhaust gases were present in the cooling system and nothing. The solution stayed at its normal color, so that narrowed it down to the intake gasket so Iíll tear it down and see if it was the intake gasket and replace if it is. However the truck currently holds it temperature and the thermostat seems to open up when it reaches it operating temperature. I did see that I was losing some coolant during a one month period. I am hoping that the intake gasket is the only thing that needs replacing.
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Old 02-15-2018, 06:59 PM
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The BEST solution is to replace the manifold gaskets... If it leaks slowly over a MONTH then you have a very small leak. Sometimes those leaks can be sealed with a SEALANT. I have used BARS 1109 COPPER with good luck. You don't have to drain the coolant, just pull one end of the top hose and pour it in between the thermostat and radiator and reinstall. After running a couple days hot/ cold/ hot... it should seal up the leak.. You may want to use half the bottle... I think a bottle is about 16 oz and cost $10. at Auto Zone or other.
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Old 02-15-2018, 07:05 PM
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Old 02-16-2018, 10:45 AM
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Originally Posted by steve(ill) View Post
Sometimes those leaks can be sealed with a SEALANT.
Sometimes yes, but if the intake is a plastic one then I doubt it would work.
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Old 02-16-2018, 06:59 PM
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He said he is loosing a quart in a month.... that is very slow. Sealer don't know if the the pin hole is gasket, steel or plastic... ?


Now if it has a long crack that will continue to expand, that's different.
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Old 02-17-2018, 12:45 AM
SDDL-UP SDDL-UP is offline
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I've had my radiator spring a pretty good leak where the plastic end caps are crimped on. When it first started it was intermittent. Are you sure it's not your radiator?
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