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Randon bad mis-firing

posted by  Rickb on  Tue Dec 5 05:59 CST 2006
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Hi - Over the 2 months I have had randon (a few jerks)misfiring while driving on the highway. Last month we change the fuel filter (very plugged) and was good for about 1 week. It then started to randomly misfire again. Change filter again. (Lamda light on - code said lean fuel mixture) Good for 1 day. Now have random times when car feels like it runs only running on 1 or 2 cylnders for a minute, then runs great. Two minutes - later - mislfiring bad again. 4 minutes later - no problems for the next hour's drive.

Any ideas? Mas flow sensor? fiel pump?

Thanks








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    Randon bad mis-firing

    posted by  someone claiming to be ksg on  Tue Dec 5 08:29 CST 2006 [RELATED]

    1) monitor the fuel pressure with a gauge to see if it is stable or not. Also does the engine ever misfire when the car isn't moving?

    2) check wiring at MAF sensor, ECT sensor, Camshaft position sensor.

    3) Check for a cracked, brittle or otherwise leaking vacuum hose that may open wider or narrower as engine shifts under torque. Especially look at hoses to idle air control motor, brake booster, and any that are located after the MAF sensor in the air flow path (letting in unmetered air).








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      Randon bad mis-firing

      posted by  MadeInJapan on  Tue Dec 5 15:10 CST 2006
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      last visit: Sat Oct 2 06:34 CST 2010
      [RELATED]

      I would go with the MAF and possibly bad plug wires that are arching with different vibrations. Check these...
      --
      1998 S70 T5 Emarald Green Metallic (125K), 2004 V70 2.5T Ruby Red (45K), Previous Owner of Black '94 850 Turbo Wagon (Sold at 140K and miss her). My cars have been running so well lately they've got me worried.







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