2004 Aveo Issue

[Darsen]

Ok, got a bit better of an update today:

I thought it was just Cyl#2 that had low compression, but it is actually Cyl#2 and Cyl#4 that are having low compression.

He told me that everything seems to be timed correctly.

I asked about the possibility of the motor "jumping a tooth", where it was running perfectly then all of a sudden started skipping again, and he told me he didn't think that had happened. But where it is now low compression on 2 and 4, that seems to lend credence to the fact that something might have happened to the valves on those cylinders.

I am wondering if they used the Chevy shop manual to complete the repair or were doing it based on how they have done this for other cars in the past.

This is not a fly by the night shop, this is an ASE certified shop and they actually are the shop of choice for the town I live in. These are the certifications they have on their website:



Your advice on the matter is greatly appreciated and anticipated.

Thanks!

Darsen

[avguy]

... I asked about the possibility of the motor "jumping a tooth", where it was running perfectly then all of a sudden started skipping again, and he told me he didn't think that had happened. ....

Doesn't matter how many certifications the guy has, because 'didn't think' is an unacceptable response. In a case like yours, the correct course of action is to disassemble down to the point of being able to check the timing marks again. Once that's been done, there will be no 'think', because it will be apparent (i.e. fact) if the timing has jumped or not. IMO this is something he should have automatically done, and I'd be extremely suspicious of what's going on with this shop.

And throw in on top of that him reporting one 'good' compression test, followed by a 'bad' one citing 'worn ring', and lots of red flags go up for me. I'll tell you flat out that it's a waste of time relating feedback from this forum to him (he could care less about that). Your only 2 choices are continuing to follow the recommendations of this outfit and hope for the best, or take it somewhere else for another opinion. Good luck with it, whichever way you go.