Starting problem in damp weather


Asked by Jan 15, 2016 at 03:54 AM about the 1997 GMC Sierra 1500 C1500 SL Standard Cab LB

Question type: Maintenance & Repair

When my 1997 GMC Sierra 1500 sits for several day, it does not want to start

10 Answers


A lot of things can cause this but if it is because of moisture, sounds like ignition, and a tune-up would be in order. Another thing would be fuel pressure, it should be 56 to 63 lbs at the schrader valve.

2 out of 2 people think this is helpful.

Hi Rowefast, Thank you for your suggestion. When I tried to start the truck the next day, it started first try, and runs smoothly. Do you have a suggestion as to where I can apply Di-electric gel to prevent moisture problems?


Well ya but it shouldn't have problems when it is damp out. I like doing this on new ignition parts to be installed. Is this a 4.3L?

1 out of 1 people think this is helpful.

Same here. Yes it is a 4.3L.Thank you for your help As the truck is new to me, I do not know how to get at the ignition parts. My previous truck (A 1983 Chevy, with a 350 CI) had it all in the open, and easy to get at. Do you know where I can get a shop manual?


Ya if you plan on working on it you are going to need the shop manual. If you search on line you can find them. The 4.3L Vortec engine when they came out had a poor design in the fuel delivery system. Thats why I mentioned checking the fuel pressure in the beginning. The fuel regulators, spider fuel lines, and injectors under the plenum get to be leaky. They recommend replacing these items as a unit as it is redesigned. You can replace what is necessary at the time but within 6 months your right back in there again. Its not that hard of a job to do, just expensive.


Thank you for the suggestions, and thoughts. I will do more research on the fuel regulators, spider fuel lines, and injectors. The motor was replaced in 1998.


Dielectric grease on spark plug boots and any other places moisture can get into electrical connections may help.

1 out of 1 people think this is helpful.
Best Answer

Thank you for the help. I will try this suggestion.


Not fixing the problem, the band aid is going to leak.


I will talk to my mechanic on Wednesday

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