Quote:
Originally Posted by LWJ
The compression test 60K ago was done cold. Bad reading. Ignore
Trouble shoot for today. What does a leakdown show? I will confess I know nothing about PCV failures.
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This is for xc70 volvo 2005. Another esteemed pelican recommended I dump it and just buy another- they are a dime a dozen- but I'm too far in....
Thanks (for new leakdown test idea). I might do that. My gut instinct is that after redoing the engine, both cams might be in a retarded position during cranking until they can get oil pressure and be directed to advance by the computer, might be lagging behind. They've got about a significant degree oil activated advance when fully advanced. I'm scared I will just get another low compression reading- especially with my '
high tech' HF gauge.
I might try dumping some oil into the cylinders to get some lubrication for the test, but the CVVT system really leaves leaway for interpretation. Out of 360 degrees, is seems to be about 80 degrees of play in the preload.
When I redid my PCV system, the intake was shredded, to the point I could put my mouth over the holes and breath comfortably through the leaks. Now there are none, but still no love on negative pressure.
The real kicker here is that the engine is struggling at idle and dying/surging... (it was before I messed with it- and that's WHY I messed with it) and after "my" fix, now backfiring, I think in the intake. I have since replaced injectors and fuel pressure regulator, and Ive got a new fuel filter and pump, and new plugs, so the intake side should be good.
I'm going to change O2 sensors this weekend- but- even if that fixes the idle/surges, that doesn't address the lack of vacuum.
I am coming to terms with pulling the head, dropping the pan, and re-ringing it, but want avoid if possible.... Thanks all.