May 7

2001 GMC Sierra 2500HD – Tune Up

Auto Repair, GMC Trucks


Our latest featured service is a Tune Up performed on a 2001 GMC Sierra 2500HD, brought to us by a client from Richmond, BC.

GMC Sierra 2500HD
2001 GMC Sierra 2500HD 2 wheel drive

This GMC Sierra 2500HD is truly a heavy duty light truck, from the 8.1 liter engine in the front to the massive 11.5 inch differential in the rear.

Our client brought this truck to us for a comprehensive inspection and maintenance service. On road testing the truck we noted that the engine performance was not what one would expect from an 8.1 liter engine. It was sluggish and the engine ran a bit roughly at idle.

I am reluctant to use the term tune up as it refers to a mostly obsolete service, however in the case of our GMC Sierra 2500HD, the services that we did were about as close to a “tune up” as you can get these days.

Our “tune up” consisted of replacing spark plugs and ignition wires, a fuel filter replacement and a Motorvac Fuel Injection Cleaning.

Spark plugs normally last a long time on these engines: well over 100,000 kilometers. As engines age however other factors occur which shorten spark plug life. In the case of this engine there was excessive carbon deposits on the plugs and this is usually caused by increased oil consumption. The deposits were not severe but enough to cause subtle running issues.

After the service the engine ran smoothly and power was restored.

For more about the GMC Sierra 2500HD click here

For more about tune ups click here

GMC Sierra 2500HD
3 of the 8 old spark plugs


About the author 

Bernie Pawlik

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