Time to pull the head. If it developed that quickly, I'd venture a guess
that the valve is bent, or chipped.
TonyC
-----Original Message-----
From: Michael Clark <dml@mikesdakota.com>
To: dakota-truck@dakota-truck.net <dakota-truck@dakota-truck.net>
Date: Wednesday, August 20, 2003 10:58 PM
Subject: DML: Zero Compression!!!
>
>Ok, so a few days ago I'm cruising at 90 and I lean on
>the gas a bit, not enough to downshift but crowding it
>fairly hard. All of a sudden it hesitates and
>backfires through the exhaust. So I let off, take my
>exit and come to a stop. After that I had a bad miss
>in the engine. Yesterday I did a tune up, new
>cap/rotor, plugs, even pulled the valve covers and
>checked for misaligned or loose rockers, all looked
>fine. By this point the miss had turned in to a
>miss/popping sound coming from the exhaust. Like a
>backfire but nowhere near as loud or sharp. So this
>evening I put my compression guage on it and found
>that number 7 has absolutely ZERO compression! The
>plug was also very black after only 30 miles. I put in
>some oil in that cylinder but compression remained at
>0 on the guage so I think the rings are fine. My oil
>looks nice and clean so I don't think it's a cracked
>head. I'm thinking it's a burnt or bent valve (leaning
>towards burnt). Does this make sense to you guys?
>Could this be what was causing my code 52 (mixture too
>rich)?
>
>--Mike
>www.mikesdakota.com
>
>
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