Question about 1997 GMC Sierra

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Having problems starting a 97 GMC Sierra

I have a 1997 3/4 ton GMC Sierra. When the key is inserted and turned , the engine turns over but has a hard time starting, sometimes making a series of noises , sort of a kerthump . I have just had a new distributor installed but I am wondering about sensors . What sensors should I have checked ? This truck is harder to start when the weather is damp or humid.

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  • woodlandfarm Jan 05, 2009

    I have the same problem - same truck - starts fine all year throughout the summer, but when it rains or is cold and the truck has been sitting for awhile it will not start. Also have the same kerwhump thump noises if it is on the verge of starting. As well, the truck may stall when coming to a stop at the first stop light after 6-7mins of running. This last time I went to start it, after it had been snowing, it turned over endlessly with no noises at all. I put in a space heater directed at the ignition area and covered all with blankets and let it heat for a few hours. It started up right away after this. I suspect moisture in the cap & rotor - and it is a new cap & rotor too. I have checked the vents at the bottom of the rotor last year to see if they were plugged, but they weren't. Any suggestions?

  • woodlandfarm May 11, 2010

    How could the timing being off affect the truck differently in damp weather?

  • Anonymous Mar 28, 2014

    noise comes from dash sometimes. its loud at times. sounds like it started from right vent.

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Sound like the timming is off i would check it first then have the starter checked that might be your noise

Posted on Nov 29, 2008

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