Problem

Asked by Mar 03, 2017 at 05:40 AM about the 2000 GMC Yukon SLE 4WD

Question type: Maintenance & Repair

i have backfire when revving on the second gear. If
anyone knew the problem please help.

4 Answers

87,085

A back-fire is an indication of timing being off, wrong fuel air mixture, or fuel pressure, a bad lifter or rocker arm,

1 people found this helpful.

What is the solution?

87,085

You wouldn't know the solution until some diagnosis is done. Start by having the trouble codes scanned. Write them down. Your definitely will have a miss-fire code. Fuel pressure should be checked along with a fuel pressure bleed down test. The trouble codes may indicate whats going on with the timing, like a camshaft sensor or something. The valve cover would have to come off to check the rocker arms, may even have a worn camshaft. Do you hear any excessive ticking from on top the engine? You just have to start looking at it.

87,085

Having the vehicle scanned for trouble codes are a big help. You want to start with the easy checks first.

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