Art,


Some of the hoses I assumed were good since they were fairly new, but I realized that new parts can be defective, so I thought I should change them.

I suspect it might be the IAC to manifold hose. I tested the old one, put 50 psi on it, nothing. I put it on my vacuum pump at 25 inhg, found nothing. Since it fits under the manifold and seems always under stress, maybe it was contorted to leak? That said, it could have been a different hose as I just went through and did a few when I did the IAC hose.

The intake gasket was next my list, but I fixed the problem before I got there. I probably should go ahead and do it now since this one has 360k miles on it. I need to do the exhaust gasket anyway since I hear a little leak there while under heavy acceleration.

All the Volvo and Indy shop guys said it was a bad IAC. I suspect they replace a lot of them regardless of condition?

As for me, a smoke test from the start would have found the problem without the hassle. I'm still learning.

I plan on doing a compression test as well just to gauge engine/valve condition.
I'm planning on a valve job at 500k. Maybe it won't be needed?