Compression Test Results.. Ideas?

[BuNcHeSs]

Running rich, slightly warmer than usual, thought it was a head gasket but I have low compression in all cylinders, all were just around 135. Wet tested adding 1 tbsp of 5W30 and every one went close to 180. Tested each cylinder multiple times, after multiple drives with engine at operating temp and WOT.

Where do I go from here?

 

[gofer]

Have you done a BLT?

Next time your car starts acting up I don't recommend beating on it to see if you can break it more.

 

[BuNcHeSs]

Would a boost leak cause me read low compression even when doing a compression test?

 

[gofer]

A stock 2g (8.5:1 CR) service limit, per the FSM, is around 130psi doing a dry compression test if I remember correctly as long as each cylinder is with ~15psi of each other. You doing a wet test just means your rings are a little worn, but the dry test didn't fail it was just close to the service limit.

Going rich in boost is a classic case of a boost leak. I could see why you'd think maybe a blown headgasket with the hotter temps but a compression test isn't a very good indication of a blown HG, you'd want to do a leak down test to know for sure.

Me personally, I'd rather do a BLT since it's quick and you've probably got a couple even if your headgasket's blown. If the BLT comes up negative, do a leak down test. Craig (Calan) has a nice "how-to" in the tech articles on it...

 

[BuNcHeSs]

Thanks! I appreciate it