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Overheating round 4!
- Thread starter Jordysoso
- Start date
I think you need a leak down test.
http://en.wikipedia.org/wiki/Leak-down_tester
http://www.youtube.com/watch?v=ofSiTGeLXvc
http://en.wikipedia.org/wiki/Leak-down_tester
http://www.youtube.com/watch?v=ofSiTGeLXvc
The overheating itself could cause the misfiring (flashing CEL). When the overheating gets fixed, the misfiring may cease along with the overheating.
I remember Igidy only had a misfire when his engine got hot,.... his issue ended up being coils.
I think you've got compression gases leaking past the head gasket and into the cooling system. The compression pressure is around 170 PSI and can easily displace the coolant that's at a pressure of only about 16 PSI. After the coolant is forced out, the engine overheats quickly.
Is it possible to re torque your head bolts ??? (I'm asking because I don't know,... retightening head bolts may not be a smart thing to do ??,... you may have to do an entire head gasket job or replace all your head bolts.)
I think that leak down test should be your next step,... it may very well pinpoint your problem.
I remember Igidy only had a misfire when his engine got hot,.... his issue ended up being coils.
I think you've got compression gases leaking past the head gasket and into the cooling system. The compression pressure is around 170 PSI and can easily displace the coolant that's at a pressure of only about 16 PSI. After the coolant is forced out, the engine overheats quickly.
Is it possible to re torque your head bolts ??? (I'm asking because I don't know,... retightening head bolts may not be a smart thing to do ??,... you may have to do an entire head gasket job or replace all your head bolts.)
I think that leak down test should be your next step,... it may very well pinpoint your problem.
...or a crack in the head itself.
Under the forces of combustion (hard to simulate with a compression check) a crack can open and allow exhaust gas into the coolant system ('bubbles in the over flow tank').
The way to be sure is to have a garage analyze the bubbles (use an exhaust gas sniffer).
Under the forces of combustion (hard to simulate with a compression check) a crack can open and allow exhaust gas into the coolant system ('bubbles in the over flow tank').
The way to be sure is to have a garage analyze the bubbles (use an exhaust gas sniffer).
One of my coils was bad, replaced that and now the misfire and CEL is cleared but I haven't driven far enough to get it hot (usually it starts climbing after 20miles at highway speed). The guy at the shop drove the car around for about an hour and left it run in the parking lot for another hour, and the temp gauge did not move. With no airflow, fans kicked on normally and the guy said he couldn't get it to overheat or get hot at all. Retourqing head bolts I don't think is smart. But tearing into the motor again is gonna suck. If a shop does a leak down test, compression test, and coolant exhaust sniffer test, how much you think that'd run?
