Question about 1991 GMC Sierra

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When its a rainy day or really humid in the morning, my gmc sierra wont start? What could be the problem, and how much money will it cost to fix?

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  • 45 Answers

Prob cap rotor wires.

Posted on Sep 13, 2010

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My Blazer cranks over and over...killed the battery : ...next morning the second time I tried cranking it over it made a poof sound and started but with a lot of chugging. Can anybody help please?


Lynda, If it is the 4.3 V6, they are prone to getting moisture in distributor which causes the symptoms you are talking about including the poof. You can have scanned to see if trouble codes are stored, you may get multiple misfire.
If continues doing this have cap and rotor replaced and if wires and plugs are old do them to. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

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1 Answer

Brain box


It definitely sounds like an electrical problem. You should add more details to narrow the search.....such as it works sometimes.....or it is worse on humid or rainy days. These kind of details would indicate a faulty, or dirty connection. It does sound like the first place to start would be the ECU or main computer. I myself would disconnect the connectors in and out of that black box. Then I would spray them with electrical cleaner/lubricant then see if that helps. Of course swapping out a known good ECU would really help, but returning one of those could be problematic if that didnt cure your problem. If it is the humidity because of the change of seasons.....try letting the car dry out in the sun with the doors open.

Apr 20, 2014 | Buick Rendezvous Cars & Trucks

1 Answer

I have 2000 gmc jimmy it wont start sometimes it has me clueless


It could be the ECU,but I am gonna put my money on the fuel pump and say its a fuel issue. Have you changed the fuel filter? the most common problem with GMC's is the air flow mass meter. Spray it with some air flow mass meter cleaner and see if that helps.

Dec 01, 2013 | 2000 GMC Jimmy

1 Answer

Wont start fuel spark


You can check for power at the pump relay, or jumper it to make the pump run.

Jul 08, 2013 | 1997 GMC Sierra

3 Answers

Car sputters and engene light comes on in the morning of rainy days only


check the BAP (barometric air pressure sensor), rainy days mean odd Barometric pressure, so the sensor could be faulty, a simple multimeter can show you what voltage it is putting out, and replacing it on a rainy day might show you that it is faulty as well

Mar 01, 2011 | 2003 Mazda Tribute

1 Answer

Wont start no fire


Sounds like fuel pump

Jan 09, 2010 | 1998 GMC Sierra

1 Answer

Difficult starting in warm weather


Check the vacuum hose attached to the fuel pressure regulator under the hood next to your intake pull it off and see if any fuel is present, if there is replace regulator.you may have to tap hose with your finger to get any fuel out or start vehicle run until hot then shut off and recheck if no fuel present in vacuum line let me know and we can try something else.

Aug 23, 2009 | 1999 GMC Sierra

1 Answer

I hav a gmc sierra truck that wont shift into third


Well it was alot fo fun but it is goin gl to cost ya, when the tranny was lock suddenly one to the drums flipped the tooth and now the clutches not apply, the tranny must be dismantle to fix.

Jul 17, 2009 | 1993 GMC Sierra K1500

1 Answer

Only if very humid or after heavy rain gmc 97


sounds like moisture is getting into your wiring or even the ecu

Jun 28, 2009 | 1997 GMC Jimmy

1 Answer

03 GMC sierra 1500 sle wont start..


if your check engine light is on,yes.it worked for me.

Mar 27, 2009 | 2003 GMC Sierra 1500

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