My 325i has had a misfire issue since I got it - rough idle and "puh-puh" sounds when revved.
I've replaced all the ignition components, adjusted the valves w/ the little spring tool, and smoke checked for intake leaks, while replacing the intake manifold gaskets to be sure. The bitch tube orings were shot so I hoped that was my problem, but no dice.
I decided to run a compression test since none of those things seemed to help. I'd noticed oil in the coolant when doing a flush - but the head looks pretty new to the car, so I couldn't tell if this was just leftover from a previous blown head gasket or something new.
Anyways, I did the compression test when the engine was about 1/4 of the way up the temp gauge. I used a cheap Autozone rental. My readings were within 2-3 psi of 80psi across the board, with one 90psi and another 75.
My question is, does this sound right? Can my engine even run with half the compression it's supposed to have? I tried to get the compression tool plug in there snug to make a seal, but I could only get it in there so tight.
Just trying to determine what I should do about this misfire since nothing I've tried so far has fixed it. I'd hate to pull the head, replace the gasket, then have the same damn problem when I put it back on.
I've replaced all the ignition components, adjusted the valves w/ the little spring tool, and smoke checked for intake leaks, while replacing the intake manifold gaskets to be sure. The bitch tube orings were shot so I hoped that was my problem, but no dice.
I decided to run a compression test since none of those things seemed to help. I'd noticed oil in the coolant when doing a flush - but the head looks pretty new to the car, so I couldn't tell if this was just leftover from a previous blown head gasket or something new.
Anyways, I did the compression test when the engine was about 1/4 of the way up the temp gauge. I used a cheap Autozone rental. My readings were within 2-3 psi of 80psi across the board, with one 90psi and another 75.
My question is, does this sound right? Can my engine even run with half the compression it's supposed to have? I tried to get the compression tool plug in there snug to make a seal, but I could only get it in there so tight.
Just trying to determine what I should do about this misfire since nothing I've tried so far has fixed it. I'd hate to pull the head, replace the gasket, then have the same damn problem when I put it back on.
Comment