Question about 1999 GMC Yukon

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99 yukon it won't start sometimes and other times it will start like nothing is wrong

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Have the cranshaft position sensor checked and make sure the wiring isn't grounded somewhere. If the Crankshaft Position Sensor is bad or skipping a little the engine will crank but not start. It is located on front of engine behind fan. Haynes Manual (#24065?) has a great section on troubleshooting the sensors. Good Luck

Posted on Jul 15, 2008

  • zimm828 Jul 17, 2008

    You should also check and see if the oil pressure switch is interconnected to the fuel pump cutoff. If oil pressure is not sensed the fuel supply is cut so the engine is not run dry and damaged.

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Check the battery to starter ground wire......... I had the same problem and thats what it was

Posted on Sep 02, 2008

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SOURCE: 99 Yukon windshield wipers

We had the same problem and sometimes they wouldn't turn off. The intermittent wipers were random. We replaced the wiper motor. Be sure to get the motor with two balls on the wiper shaft (one for each wiper arm). If you can't find it, you'll have to change the part out on the new motor. Keep the wiper arms in the same location on removal, or it will jam and you'll have to start over.

Posted on Aug 10, 2008

Autotroubles
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SOURCE: Sometimes when i try start to my 99 tahoe i

Bad grounds at ECM, loose harness from ECM, bad ignition switch.

Posted on Oct 05, 2011

Testimonial: "Hey folks appreciate all the advice I found my problem to be a battery connection on the hot post side, wish I found it before paying for a ignition switch replacement. Thanks again"

6ya6ya
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Posted on Jan 02, 2017

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I don't know if Yukon's had this problem or not, but once I changed a fuel pump on a Chevrolet Blazer only to find out that then the ignition switch went bad. I changed out the ignition switch and it started fine after that. Please rate my answer so I get my points for it.

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99 Yukon windshield wipers sometimes won t turn on and other time stop after working


We had the same problem and sometimes they wouldn't turn off. The intermittent wipers were random. We replaced the wiper motor. Be sure to get the motor with two balls on the wiper shaft (one for each wiper arm). If you can't find it, you'll have to change the part out on the new motor. Keep the wiper arms in the same location on removal, or it will jam and you'll have to start over.

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