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Why does my 1979 gmc truck backfire - Cars & Trucks

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Defective plug wires or a flat camshaft lobe.

Posted on Nov 30, 2012


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Posted on Jan 02, 2017

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SOURCE: why does my 1998 gmc truck backfire and stutter sometimes stall when driving

my friend the car backfires if its runing lean ( insufficient fuel ) or runing rich ( insufficient oxygen ) this mostly in carbourated cars would make incomplete compustion . in engine with fuel injuction there may be a leak in the intake valve that makes the fuel to burn in the exhaust pipe . so check for leak asap

Posted on May 29, 2009

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SOURCE: 1979 ford pickup 460ci backfired now nospark

the backfire comes from timing, check or replace the coil

Posted on Mar 13, 2010

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1994 gmc running lean backfires when i let off the gass no power

Go to auto parts store get fuel pressure gauge test fuel pressure ,could be that your fuel pump is on its way need to have at least 50 psi. Check fuel filter also.

Apr 21, 2012 | 1998 GMC Sierra

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1979 ford pickup 460ci backfired now nospark

the backfire comes from timing, check or replace the coil

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Ignition tumbler is noy ingaging 1979 GMC 1/2

the tumblers are jambed
any locksmith will advise to replace the lock cylinder for the part is fairly inexpensive. if repaired it may jamb again very soon. I am a certified locksmith as well

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1999 GMC Yukon seems to backfire once in a while

look for vac leak at egr valve, when cold spray carb cleaner on and see if it speeds up the eng

Jun 27, 2009 | 1999 GMC Yukon Denali

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Why does my 1998 gmc truck backfire and stutter sometimes stall when driving

I would suspect a burnt valve. An engine compression test will verify this.

May 29, 2009 | 2001 GMC Yukon XL

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i was in need of a wire diagram for a 1979 gmc k1500 pickup as we are trying to restore it ourselves . so i couldnt get answers via the internet i went old school and went to the library and copied it out of a chilton. plain and simple . people ahve gotten lazy and forget how to do things the old fashioned way before we all had internet .

Jul 23, 2008 | 1983 GMC K1500

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