Truck backfires only when shut off????? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Geno H · 09-12-2008, 05:32 PM

When I shut my truck off after it is at operating temprature it backfires one time very loudly like a CANNON. Any ideas? Is it the timing maybe? I havent check it but I did have to replace the muffler after I bought it. Upon further inspection of the old muffler it was sure enough blown out not rusted out or worn out but it was blown apart. Any help would be appreciated.

Geno H

gchemist · 09-12-2008, 08:35 PM

Too much timing, a bad ground, a bad electrical connection and possibly too much idle.

Geno H · 09-13-2008, 02:01 AM

Thanks gchemist. I will check all of those things out.

crawdadfox · 09-13-2008, 04:12 PM

Are you feeding it red or white bean's?!! Just kiddin' i would say it's ignition and / or timing issue.

raiders3581 · 09-14-2008, 11:40 AM

I dont know maybe just me two cents , but does it put out black smoke when it starts? If so carb could be sticking a little dumping gas after shut down and since engine still hot enough to ignite fuel.. any way just a guess

09-12-2008, 05:32 PM	#1
Geno H Registered User Join Date: Aug 2008 Location: Raymond Kansas Posts: 28	Truck backfires only when shut off????? When I shut my truck off after it is at operating temprature it backfires one time very loudly like a CANNON. Any ideas? Is it the timing maybe? I havent check it but I did have to replace the muffler after I bought it. Upon further inspection of the old muffler it was sure enough blown out not rusted out or worn out but it was blown apart. Any help would be appreciated. Geno H __________________ 1971 GMC 1/2 ton Project 1982 Chevy 3/4 ton Daily driver 1982 Chevy 1/2 ton SWB Big Project Last edited by Geno H; 09-12-2008 at 05:34 PM.

09-12-2008, 08:35 PM	#2
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Re: Truck backfires only when shut off????? Too much timing, a bad ground, a bad electrical connection and possibly too much idle. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

09-13-2008, 02:01 AM	#3
Geno H Registered User Join Date: Aug 2008 Location: Raymond Kansas Posts: 28	Re: Truck backfires only when shut off????? Thanks gchemist. I will check all of those things out. __________________ 1971 GMC 1/2 ton Project 1982 Chevy 3/4 ton Daily driver 1982 Chevy 1/2 ton SWB Big Project

09-13-2008, 04:12 PM	#4
crawdadfox Registered User Join Date: Aug 2008 Location: New Orleans Louisiana.....a great place to visit but you wouldn't want to live here!!! Posts: 883	Re: Truck backfires only when shut off????? Are you feeding it red or white bean's?!! Just kiddin' i would say it's ignition and / or timing issue.

09-14-2008, 11:40 AM	#5
raiders3581 Junior Member Join Date: Jun 2006 Location: pomona ca Posts: 187	Re: Truck backfires only when shut off????? I dont know maybe just me two cents , but does it put out black smoke when it starts? If so carb could be sticking a little dumping gas after shut down and since engine still hot enough to ignite fuel.. any way just a guess __________________ 67 short bed fleetside/1997 c1500 exteded cab/ 2004 accord/87 c10silverado 350 od tbi

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