Boost leak test results

[kennyg]

So I was finding that my car would kinda fall on its face at around 2500-3000 rpms, and then at around 3000 it would start to pull ok. I could really hear my turbo spooling hard compared to the acceleration that I was feeling, so I figured that I had a boost leak.

Bought that kit, hooked it up and I could only get about 7-8 psi max out of it and the hissing noise of leaking air I was hearing was coming from around the head, and found that pressure was being lost into the head. When I would unscrew the oil cap or pull the dipstick out pretty much all the airpressure would be released.

Curious what would be the main cause of a loss this way? Head gasket, valve seals? I replaced the pcv valve but that didn't seem to change anything. Any thoughts?

Thanks, Ken.

 

[shibby1036]

what about around your intake manifold to head flange? another reason is that could have floated a valve or may have a bent vavle or your not getting good valve to seat sealant. could be the head gasket but do a comp test and see if you can locate the leak first. if it's that big of a leak to where you notice and actually hear the hissing chances are that you would be throwing white smoke out your exhaust. when you do a comp test use some soap and water in a spray bottle and quirt it around the head to help out. play find the bubbles, then get back. you might need 2 people for this task. or if you have a compressor tank and some fittings with a regulator you can moch up a continues pressure tester and use it where your spark plugs go, (BE CAREFUL AND DONT OVERPRESSURIZE YOUR CYCINDARS)