It's hard to get it to stop! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gibsonh · 07-11-2006, 01:58 PM

Recently replaced the carb on my 86 GMC 305. Bought a rebuilt on line from Carbs Direct. Since I installed it on the engine diesels when you turn off the key. I've tried reseting the timing , and adjusting the carb with little or no change. Any ideas what might be wrong?

Jonboy · 07-11-2006, 02:25 PM

Sometimes run on occurs due to carbon in the combustion chamber creating hot spots. Try using some top end engine cleaner and see if that helps your problem.

jimfulco · 07-12-2006, 12:58 AM

Have you tried decreasing the idle speed?

gibsonh · 07-12-2006, 10:47 AM

Haven't tried it yet, but will and let you know if it helps .Thanks

gibsonh · 07-12-2006, 10:53 AM

Yes, not change. When I first put the carb on the engine the fast idle was way out of adjustment but I have that all strightened out.( I think) It 's worst after you've been running the A/C.

07-11-2006, 01:58 PM	#1
gibsonh Registered User Join Date: Dec 2005 Location: Hopewell, Va Posts: 3	It's hard to get it to stop! Recently replaced the carb on my 86 GMC 305. Bought a rebuilt on line from Carbs Direct. Since I installed it on the engine diesels when you turn off the key. I've tried reseting the timing , and adjusting the carb with little or no change. Any ideas what might be wrong?

07-11-2006, 02:25 PM	#2
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	Re: It's hard to get it to stop! Sometimes run on occurs due to carbon in the combustion chamber creating hot spots. Try using some top end engine cleaner and see if that helps your problem. __________________ 1974 Jimmy- 5.3/4L80e/NP241

07-12-2006, 12:58 AM	#3
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Re: It's hard to get it to stop! Have you tried decreasing the idle speed?

07-12-2006, 10:47 AM	#4
gibsonh Registered User Join Date: Dec 2005 Location: Hopewell, Va Posts: 3	Re: It's hard to get it to stop! Haven't tried it yet, but will and let you know if it helps .Thanks

07-12-2006, 10:53 AM	#5
gibsonh Registered User Join Date: Dec 2005 Location: Hopewell, Va Posts: 3	Re: It's hard to get it to stop! Yes, not change. When I first put the carb on the engine the fast idle was way out of adjustment but I have that all strightened out.( I think) It 's worst after you've been running the A/C.



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