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I have a 90TT that I rebuilt the engine about 2 years ago. New pistons, rings, valves, removed the EGR, gutted pre-cat, no main cats, 740cc injectors, JWT reflash...the car ran GREAT. This past summer I noticed that it was starting to run slower and it was not boosting enough, and kept getting worse. I had my mechanic look at it and we found that the drivers turbo waste gate valve was stuck open. After fixing that, it seemed to run a lot better, but still not as good as it did before the turbo acted up. Shortly after, I noticed a slight exhaust leak, which slowly progressed and is much louder now and my mechanic is still not sure where it is coming from exactly. It sound like it is near the rear of the engine. I assumed that it had to do with the turbo again since it happened shortly after and was taken apart to fix the stuck waste gate valve. So instead of fixing the turbo again, I was just going to upgrade the turbos to larger ones, but prior to, I wanted to make sure the compression was good. I drove it work that day and it ran like complete crap. I could barely accelerate. He did a compression test and this is what it showed (he tested the compression by only removing one plug at a time - that is why the numbers are lower on average):
Rear of Engine
120 - 75
120 - 95
120 - 110
Front of EngineHe thought that may have stuck rings so he soaked the left bank over night with carb cleaner and this is the result:
120 - 95
120 - 115
120 - 120 He said the spark plugs on the left bank were showing it to run really rich. Basically, he thinks the rings are stuck. Could the bad turbo have caused the left bank to do that from unburned fuel? Any suggestions before I re-tear apart this engine? Also, using a borascope, he said the piston walls looked fine.
Soy dios y soy el diablo |
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