Question about 2003 GMC Sierra 1500

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What is the spark plug gap for 2003 gmc sierra 1500 hd 6 litre?

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Hello there:
the gap for you're gmc should 0.45
hope this is help full

Posted on May 30, 2010

Testimonial: "I was told by canadian tire the gap is 0.40 is that still ok? "

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Also call the dealer with your VIN number if you are having electrica oproblems. See
ELECTRICAL SYSTEM:FUSE AND FUSE RECEPTICLE
Description: Water intrusion into the kick panel areas in front of both the driver and passenger doors can cause a corrosion path between the battery feed and the electrical ground. This condition can cause an electrical short leading to ignition and combusion of the plastics in the electrical components of the vehicle resulting in a vehicle fire. Dealers will replace the 25 AMP circuit breakers with 25 AMP fuses in the fuse block; remove a temporary paper fuse-block cover; install a plastic shield over the fuse block; replace and reorient the power door lock relay (if equipped); inspect the remote keyless entry module (if equipped) for signs of corrosion, replace if corroded, and reorient it; and apply additional body sealer in key areas.

Water intrusion into the kick panel areas in front of both the driver and passenger doors can cause a corrosion path between the battery feed and the electrical ground. This condition can cause an electrical short leading to ignition and combusion of the plastics in the electrical components of the vehicle resulting in a vehicle fire. Dealers will replace the 25 AMP circuit breakers with 25 AMP fuses in the fuse block; remove a temporary paper fuse-block cover; install a plastic shield over the fuse block; replace and reorient the power door lock relay (if equipped); inspect the remote keyless entry module (if equipped) for signs of corrosion, replace if corroded, and reorient it; and apply additional body sealer in key areas.

Posted on May 30, 2010

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I have a 2003 gmc sierra 4.3 was losing spark at idle, tested all modules and cks cms replaced cms in dist still nothing moved through ign module, cks changed as well as coil. still no spaqrk checked fuses...


You may have figured this out already, but I gapped my plugs at gm specs and found out that they changed the plug # and I regapped at 0.40 instead of 0.60 and car ran fine. code finder displayed misfire prior to regapping. Check with Auto parts when buying plugs for car / truck and also make sure that they did not change plug # . These were platium plugs. springfield

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More details and other engine size can find in championsparkplugs

Good luck (remember rated this help).

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Make: GMC
Model: SIERRA 1500
Year: 2003
Engine: V8 - 5.3L - FI - - GAS

ca7fd39.jpg

Hope thats helped (remember rated this help). Good luck.

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1 Answer

2003 GMC sierra spark plug removal


That aluminum collar will come off with the boot. Go ahead and grasp the spark plug boot and twist the boot left and right and then continuing to do that pull towards you and it will come off for you. Hope this helps

Lefty64

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