Posted by jdemaris on November 15, 2010 at 07:02:12 from (67.142.130.11):
Yes, not a tractor - but at least it's an engine.
I guess my question can relate to any engine with two separate cylinder banks and a timimg belt (V2, V4, V6, V8, flat-opposed Boxer, etc).
I just bought a 2002 Subaru Impreza with the 2.5 engine. So, it's a flat Boxer four - two cylinders per bank/side. One cam per head - so two cams total but called a SOHC engine.
Ran perfect but had 110,000 miles with no service work ever done. Still had original spark plugs, timing belt, water pump, etc.
OK, no big deal, right? I've done many, many timing-belt jobs - but this time I have a problem.
I installed a new belt and idlers along with new water pump. I thought I check timing marks correctly several times before putting back together.
Started it, and it now sounds like an old Chevy I stuck a hot cam in. Idles lousy, but smooth out at higher RPMs. I drove it and a drive-speed, it seems to run fine. But . . now a engine-check-light has come on. I checked the codes and it says "misfire on cylinders 1 and 3." Note that 1 and 3 are both in one bank. So, if the timing belt was off a tooth for the one bank - it would effect only that bank and two cylinders.
I hate to second-guess myself, but also tend to believe in "cause and effect." It ran fine before, and now does not. Only other things I did, was pull out the old spark plugs - after this problem - and found the gaps at .090". I put in the new plugs gapped properly at .044". It did not fix this problem. I was a little worried that I might of screwed up a plug wire since this thing is a "hemi" with long plug boots that go into the head. They come out hard. But, I can't see two going bad all-of-a-sudden, and they check out at 5000 ohms each, which ought to be fine.
Anybody ever driven an engine with one bank slightly out of time (valve timing, that is) ?
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