Question about 2001 GMC Yukon XL

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1997 GMC Yukon won't start.

1997 GMC Yukon, 350 R motor, crabcap distributor. Somrtimes it starts right up and runs fine but sometimes it just cranks and won't start. Check engine light does not come on. Dealer replaced the fuel pump (twice) but that didn't help. I replaced the cap, rotor, coil and coil wire. ANY advice would be really appreciated. Thanks in advance.

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Posted on Dec 09, 2009

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When it won't start, remove one plug wire and connect to a clean plug--lay the base on the block somewhere. Have someone try to start the engine. If you get regular blue sparks, the ignition is fine. Look for fuel problems. Make sure the check engine light works (bad bulb?). Why did the dealer think it was the fuel pump? Did they try to read the computer for any codes? Take the vehicle to Autozone for a free computer read. You could have an intermittent crankshaft/camshaft position sensor which can cause trouble for both ignition and fuel injectors.

Posted on Nov 12, 2009

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