Question about 2001 GMC Yukon Denali

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My 2001 yukon xl 1500 consistently flashing check engine light when cruising at high speed downhill after running for ~30 minutes. The engine preformance appears unchanged while the light is flashing. the mechanical pulled code for misfire from the computer. After driving the trk around town it resets the check engine light until the next trip. Help

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OK, if you have a misfire at a high rate of speed and it is intermittent, I wouldn't worry about it unless it makes the engine lose power or affects gas mileage.

If you want the engine to work perfectly, however, I would find out which cylinder is missing, and correct the problem by replacing coil packs or what not until it doesn't do this anymore.

Also, a bad O2 sensor can cause a 'random' mix that may come and go over time.

Posted on Aug 20, 2010

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Posted on Jan 02, 2017

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