Quote:
Originally Posted by quattrorunner
But the valves don’t hold pressure till 120degrees past tdc for cylinder 1. ?
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The fact that you hold pressure at 120° past the mark and not some random number suggest that you have the wrong TDC. If you jumped a tooth, I would think it would be some number not exactly 120 that works. But it should be easy enough to check when you get back there. Do you have a simple compression gauge? If you removed all the plugs and tested it that way and reported the numbers here, we could probably determine if your peak numbers are OK, even if they are even across the board.
I’ll be curious to hear the resolution. You’re sputtering and backfiring, so something is wrong. But it’s been six years of sitting, so it may not be a mechanical thing. Bent valves often don’t even return to fully seated, and the engine probably wouldn’t start. On the other hand, one skipped tooth might not bend valves. Backfiring is often timing related. Might run like crap but I would think it would be pretty difficult to start. Maybe your EFI cam timing sensor situation shifted. So we need to keep digging.