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thermal vacuum switch

Discussion in 'The Garage' started by Big GMC truck, Jan 1, 2006.

  1. Big GMC truck

    Big GMC truck Registered Member

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    Could a thermal vacuum switch, specifically the one controling the heat riser, on a 1984 GMC truck cause hesitation? Thanks
     
  2. 73k5blazer

    73k5blazer Unplug the matrix cable from the back of your head Premium Member

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    It could. Usally just causes general crappy running until the engine warms up.
    This is in cold climates though. If your in Southern CA, or the temp is warm (above 40-50 degrees), then these things don't effect you as much no matter which position it's in.
    More likly you have a carb problem. Does it ever want to backfire on you? Is the timing set properly. Choke adjusted right? Does it only hesitate when warm, cold?
     
  3. Big GMC truck

    Big GMC truck Registered Member

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    The truck hesitates when the engine is warm. It hesitates even more in reverse, sometimes so much that it stalls.
     

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