My 99 Tran am died last week. The dealership said $2000 Just to find the problem! All they told me was ZERO compresion in # 7. I had it towed home and drained the oil. As soon as I pulled the oil plug I could smell gas and the oil was very thin, also had a small amount of metal. I had a fiberscope and tried looking up through the oil pan, but to much was in the way. So I went through #7's spark plug hole. I couldn't get a look at the valves, but the piston face looked like it had a large gash. Can someone tell me what is going on here I'm stumped. And does any one know a good shop in Tampa/St Pete area.

Thanks

 

blew a piston?????? seal????

what happen.....

how did this occur???

when did u notice???

 

Maybe you floated a valve into a piston, but that doesn't expain the gas in your oil. Zero compression means your either losing the compression threw your valves or your rings. Maybe you sucked something threw the engine and it gouged the piston and took out the rings. Could explain the gas in the oil and no compression.

 

You are getting fuel past the rings. There is always a little blow by, but should not be that bad. That is problem #1. Broken/missing/bad rings or piston failure.

Problem #2 is more than likely a broken valve. It stays open, not allowing any compression.

Now, if that broken valve punctured the top of the piston, that would explain both. Pull a cylinder head and take a look. Good luck! And if it is worst case scenario, think stroker motor.....

 

You can test to see if it's the rings by squirting oil in the combustion chamber, then do another compression test. If it's fine then you know its the rings. Squirting oil in there will seal up the rings if indeed they're cracked or broken.