Big GMC truck
Registered Member
Could a thermal vacuum switch, specifically the one controling the heat riser, on a 1984 GMC truck cause hesitation? Thanks
CK5
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thermal vacuum switch
- Thread starter Big GMC truck
- Start date
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?
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?
Big GMC truck
Registered Member
The truck hesitates when the engine is warm. It hesitates even more in reverse, sometimes so much that it stalls.
