1999 GMC Yukon 94000k 350
I am getting a misfire code on #5 cyl, The rep. said to rebuild or
Was a little reluctant on doing that so I ask for a compression test to
be done. They said that would be $120 so I said OK.. No. 5 was 140lbs
and adjoining cyls was 150. I asked what the dif was between the wet
and dry and he didnt know what I was talking about. After several
calls he got with the mech. and he said they done wet/dry on #5 with no
diff. also a leak down test showed it was bad rings. With these
responses I dont know how good of a job was done on the tests. I
replaced the plugs and the light goes off for a while and then on for a
while. My biggest question is how to rule out other possible problems
before moving on to the bad rings. Such items as EGR valve, bad
ignition, fuel, etc.
first, if 150 is good, 140 is not bad, second, they said no diff between
wet and dry-that means good rings, sounds like they didnt do it wet
because it would show a diff unless it was a valve if there was a
problem, But, if there was a valve problem it wouldn't have 140, much
lower. Since you can change plugs you can do a compression test. You can
get a tester for about $40. I would bet its a plug wire or coil if its
got one for every plug. It could even be an injector thats bad. Can you
feel the miss or does the light just come on?
Oh, this is a Ford group. Never stops the politics, so why the Chevys
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