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308 rough at low RPMs

Discussion in '308/328' started by oregonferrari, Aug 31, 2006.

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  1. oregonferrari

    oregonferrari Karting

    Aug 5, 2006
    173
    Welches Or.
    Full Name:
    Shawn and Cindy
    #1 oregonferrari, Aug 31, 2006
    I have an 81 308 gts and was driving down the road when my air pump froze and the belt melted and the air pump is history. Ever since then the car is rough at low rpms and as soon as you give it some gas it purrs like a kitten. Any Idea what might cause this.Before this happened I had no problems.
     
  2. smg2

    smg2 F1 World Champ
    Sponsor

    Apr 1, 2004
    16,332
    Dumpster Fire #31
    Full Name:
    SMG
    #2 smg2, Aug 31, 2006
    the air pump suppplied air into the exhaust stream to burn off any unburned fuel. if your 81 has a frequncy valve it miht be trying to compensate for the slightly rich condition. however on the other hand it might just be the difference in sound.
     
  3. wolftalk

    wolftalk Formula Junior

    Jan 27, 2004
    367
    san franciso area
    Full Name:
    phil
    #3 wolftalk, Sep 2, 2006
    no lambda on the '81. If the belt broke, check around and see if it knocked a vacuum line off an electrovalve.

    the ugly scenario is the cam jumped a tooth on the timing belt. I don't remember if there's a way to check that on that car without taking off the cam cover.

    the air pump itself, along with the checkvalves in the hoses, are cheap GM parts.
     

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