Down 50+rwhp - 04 GTO 226/234 600/600 112+4 325rwhp?
06-30-2013, 10:07 AM
#22
The installer said he saw coolant on one of the plugs last night and believes it's a headgasket issue. If that's the case my friend is just going to wait to pull the heads until he's ready to install his new heads. It's just hard to swallow considering the compression and leakdown tests came back good and the car doesn't use any coolant.
I'd also check the valve springs for proper pressure open. Be sure to give the valve stem seals a one over.
06-30-2013, 09:17 PM
#24
It doesn't seem to be fuel related because the a/f was good on the dyno, but if all else fails we might have to check it out.
07-30-2013, 03:37 PM
#26
My friend got sort of sick of troubleshooting and short on time, so we never got around to checking preload. He did decide to install a catch can because his oil dipstick kept popping out (he never told me about that!!!) and he says the car pulls so much better now. I recommended he do a real 100psi leakdown test to see if he is getting a significant amount of blow-by that wasn't evident in the 10psi test he did before. It sounds like either he was getting a bunch of blow-by or something was wrong with the PCV system, either way building up a lot of pressure. He's going to get it on the dyno soon to see if his butt dyno is telling the truth. Either way he says it pulls up to 6700 now which it never did before.
