JerrySab
Well-Known Member
- Joined
- Jul 11, 2020
- Messages
- 217
- Age
- 44
- City
- Los Angeles
- Vehicle Year
- 1988
- Engine
- 2.9 V6
- Transmission
- Automatic
Hey gang,
Sought help in a previous post, trying to solve a creeping thermostat. When burping coolant, noticed bubbles when warm in the overflow funnel. Which sucks. It does seem to be exhaust, as indicated by RELD test.
finally pulled it back into garage and did a compression test, but got really consistent numbers . Each cylinder hit 115-120 in first compression stroke, and each hit 180 by 5th. The rate of pressure build was the same in each one. I was expecting to find a smoking gun, or cylinder.
I did the test cold (not wanting to run the engine hot and risk damage).
also, the #5 spark plug was filthy and the threads were full of crud.
I’m stumped; and in my limited knowledge, not sure if exhaust/bubbles can enter coolant by any way other than cracked head or failed gasket. The exhaust manifolds are super leaky, I plan on tackling those, but thought I had a head gasket job to do at the same time.
should I run the engine up to temp and repeat? Or could I have dodged a bullet here?
Sought help in a previous post, trying to solve a creeping thermostat. When burping coolant, noticed bubbles when warm in the overflow funnel. Which sucks. It does seem to be exhaust, as indicated by RELD test.
finally pulled it back into garage and did a compression test, but got really consistent numbers . Each cylinder hit 115-120 in first compression stroke, and each hit 180 by 5th. The rate of pressure build was the same in each one. I was expecting to find a smoking gun, or cylinder.
I did the test cold (not wanting to run the engine hot and risk damage).
also, the #5 spark plug was filthy and the threads were full of crud.
I’m stumped; and in my limited knowledge, not sure if exhaust/bubbles can enter coolant by any way other than cracked head or failed gasket. The exhaust manifolds are super leaky, I plan on tackling those, but thought I had a head gasket job to do at the same time.
should I run the engine up to temp and repeat? Or could I have dodged a bullet here?