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Discuss 99 Yukon engine misfire in the alt.autos.gm forum at Car Dealer Forums; 1999 GMC Yukon 94000k 350 I am getting a misfire code on #5 cyl, The ...
  1. #1
    chaz
    Guest

    Default 99 Yukon engine misfire

    1999 GMC Yukon 94000k 350

    I am getting a misfire code on #5 cyl, The rep. said to rebuild or
    replace engine.
    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.


  2. #2
    Shep
    Guest

    Default Re: 99 Yukon engine misfire

    Do you have a noticeable misfire, roughness, or just the code?
    "chaz" <jkmagic@centralpets.com> wrote in message
    news:1156365981.410516.141480@m73g2000cwd.googlegr oups.com...
    > 1999 GMC Yukon 94000k 350
    >
    > I am getting a misfire code on #5 cyl, The rep. said to rebuild or
    > replace engine.
    > 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.
    >
    >




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  3. #3
    chaz
    Guest

    Default Re: 99 Yukon engine misfire

    I had a noticable misfire prior to replacing all spark plugs, After
    replacing plugs the light was still on and then later it went off. It
    is back on again now. I can't detect a roughness now...

    Shep wrote:
    > Do you have a noticeable misfire, roughness, or just the code?
    > "chaz" <jkmagic@centralpets.com> wrote in message
    > news:1156365981.410516.141480@m73g2000cwd.googlegr oups.com...
    > > 1999 GMC Yukon 94000k 350
    > >
    > > I am getting a misfire code on #5 cyl, The rep. said to rebuild or
    > > replace engine.
    > > 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.
    > >
    > >

    >
    >
    >
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    > http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups
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