Suddenly Running badly - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Minkota · 12-05-2019, 08:56 AM

Quote:

Originally Posted by Happy_dan

If it sat that long could it be the gas itself? Maybe drain it and get fresh gas in?

It has not sat long enough for the fuel to go bad (only been sitting for 2-3 months) and has non-ethanol fuel in it. it has been driven around the block occasionally during that time.

**HO455** · 12-05-2019, 10:52 AM

Don't forget the old adage "90% of all carburetor problems are electrical". Personally I would make sure the electrical side of things checked out before diving into the fuel side of things.
Start out by checking coil voltage and do a quick inspection of the ground straps. If all that is good and you have a good coil to swap I would try that too. I have seen coils that work fine cold and once they get warm the internal insulation fails and the misbehaving begins. Turn the power off and let it cool five minutes and all is good again.

Minkota · 12-05-2019, 11:31 AM

All good points, I have checked the electrical side. right now I have not found anything pointing to an electrical issue yet. Engine runs fine when in Park whether it is Hot or Cold. This weekend i am going to rebuild the carb and see if there is any change (i think it is probably needed anyway since it was sitting) then if there is still an issue I will continue to troubleshoot it.

12-05-2019, 10:52 AM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,628	Re: Suddenly Running badly Don't forget the old adage "90% of all carburetor problems are electrical". Personally I would make sure the electrical side of things checked out before diving into the fuel side of things. Start out by checking coil voltage and do a quick inspection of the ground straps. If all that is good and you have a good coil to swap I would try that too. I have seen coils that work fine cold and once they get warm the internal insulation fails and the misbehaving begins. Turn the power off and let it cool five minutes and all is good again. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

12-05-2019, 11:31 AM	#3
Minkota Registered User Join Date: Jun 2016 Location: West Palm Beach, Florida Posts: 295	Re: Suddenly Running badly All good points, I have checked the electrical side. right now I have not found anything pointing to an electrical issue yet. Engine runs fine when in Park whether it is Hot or Cold. This weekend i am going to rebuild the carb and see if there is any change (i think it is probably needed anyway since it was sitting) then if there is still an issue I will continue to troubleshoot it.



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