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'95 960 rough idle/somewhat down on power 900

posted by  JimE on  Thu Feb 14 14:51 CST 2008
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last visit: Fri Feb 15 06:37 CST 2008
[RELATED]

I have a '95 960 with a rough-loping idle and is somewhat down on power during acceleration. Last week I had a 212 code so I replaced the O2 sensor, which initially smoothed out the idle as well as cleared the code. Unfortunately, on the way to work this AM, another code (221) appeared. I removed and cleaned the AMM, which cleared the code (although the loping idle is beginning to gradually reappear). The car does not show a new code as yet. Should I wait for another code to appear, or is there something else to check? Thanks, Jim








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    MAF 900

    posted by  someone claiming to be 960 Brickster on  Fri Feb 15 14:33 CST 2008 [RELATED]

    Hi, my 95 960 did just this last year. After much toil, it turned out to be a bad MAF. If you have a friend with a 960, try swapping a working MAF in to see if this clears it up. It will show imediately. Good luck.








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      MAF 900

      posted by  JimE on  Sun Feb 17 14:21 CST 2008
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      last visit: Fri Feb 15 06:37 CST 2008
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      I finally had a chance to work on the car again today. Since I have 2 '95 960's, I just swaped the AMM out, and immediately the problem was resolved. Also, just to confirm, I hooked the (suspected) bad AMM up in the "good" car, instantly duplicating the rough running condition. Glad I was able to escape with an easy solution; I was dreading the possibility of doing the intake gasket. Thanks to all for the help. Jim








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    '95 960 rough idle/somewhat down on power 900

    posted by  DanR on  Fri Feb 15 02:38 CST 2008
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    last visit: Thu Oct 23 15:25 CST 2014
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    An intake manifold gasket leak, a bad vacuum leak somewhere in the system.

    Worn spark plugs, a bad coil or two, a bad injector. The flap door in the air intake is positioned to only take air from the hot exhaust manifold. A crack in the rubber ducting of the air intake.

    Does it idle better when first started?

    DanR '94 964 334,000 miles (100,000 on the new engine)
    --
    DanR








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      '95 960 rough idle/somewhat down on power 900

      posted by  JimE on  Fri Feb 15 06:09 CST 2008
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      last visit: Fri Feb 15 06:37 CST 2008
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      When you first start the car, the idle is so smooth that you have to practically listen or look at the tach to know it's running. After about 20-30 seconds, the idle inconsistency begins again. Can you do the old "spray carb cleaner on the intake gasket" trick to test for leaks? Thanks, Jim








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        '95 960 rough idle/somewhat down on power 900

        posted by  JimE on  Fri Feb 15 06:14 CST 2008
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        last visit: Fri Feb 15 06:37 CST 2008
        [RELATED]

        By the way, is it possible that I fried the catalytic converter last week when the O2 sensor went south (it is the original with 198,000 miles)?








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          '95 960 rough idle/somewhat down on power 900

          posted by  poolman on  Fri Feb 15 10:57 CST 2008
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          last visit: Sun Dec 26 02:03 CST 2010
          [RELATED]

          Thats classic intake gasket symptom--when you first crank the engine is running richer after a little while as she starts to warm up it gets leaner-then the leak around the intake gasket starts to really show up---
          Hope that helps








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      '95 960 rough idle/somewhat down on power 900

      posted by  poolman on  Fri Feb 15 05:47 CST 2008
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      last visit: Sun Dec 26 02:03 CST 2010
      [RELATED]

      A big +1 on what DanR told you--the intake gasket on your model was upgraded to a better material after 97--your gasket is red and the newer one is green--
      Try taking a propane tourch and just turn on the gas and point the tip to where the intake maniflod joins the head on the #1 cylinder while its at idle-thats the place they start to leak more often
      Hope that helps







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