Question about GMC Yukon

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OK i have a 1999 gmc Yukon i just changed the fuel pump spark plugs ing coil control module wires but she still wont crank she starts then shuts off whats wrong HEPL ME PLZ

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I suppose that you mean it starts but doesn't continue to run. And if you try to start it right away it'll just crank. The fuel pump is on in crank but not in run ( maybe ). Find the fuel pump relay in the underhood fuse relay panel and use a test light to cheak the pins for power and ground. First with the test light hooked to a good ground, check to see if it works first ( touch the battery positive ) then touch all the pins of the relay ( removed ) One should be hot all the time ( if not the fuel pump fuse is blown) another should be hot with the key on. one of the others will be hot only in crank ( this is the fuel pump) The last other is ground with the engine running after started. The one thats hot in crank put power to it with a jumper wire and start the engine ( it'll run ) the fuel pump also gets turned on by the oil pressure switch and the fuel pump fuse is blown it'll also not run the engine. But it'll run right after it's cranked and quit

Posted on Nov 16, 2009

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This little lady has i suspect has slipped the timing.this is a timing thing are the wires on the wright plugs????this engine wants to fire but something is stopping it if your sure fuel is getting to it then its got to be electrical im going to be bold please forgive me you have put the cables on wrong.adrian;;;

Posted on Nov 14, 2009

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This symptom sounds like the passlock system. If the computer doesn't get the correct resistance from the key cyinder, the truck will crank and start but immediately shut down and the theft light will turn on in the dash. I believe the passlock is built into the ecm, so if it was replaced, it will need to be reprogrammed by the dealer or a locksmith.

Posted on Oct 15, 2012

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That would be correct excep it seems that the 5.7l vortec seems to be kind of tempermental as the main injector pump the (spider) is very touchy im having the same problem i've changed the pump and fuel filter and in tank pump and i dont get the correct line pressure im going to put a new fuel filter in hopes that fixes it

Posted on Feb 18, 2010

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1 Answer

What runs the daytime lights, dash warning lights, and fuel pump. these seem to be the factors of why my truck only cranks but doesnt start.


Check all fuses and relay fuses. Then "crack" the fuel line to the injectors and crank to see if fuel is present. If fuel pressure is present, check for spark (Ensure no spilt fuel is around) by cranking with plug lead shorted off the spark plug.

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Do you have a little screw driver? there is a fuel pressure test port take the cap out now be carefull when you do this crank it and at the same time press the shrader does gas come out like alotnot just a little but alot if it does then the fuel pump works now if it dribbles then your fuel pump failed,Okay if the fuel pump works the only thing that is left is the coil and ignition control module, before you decide to do the module or the coil the number on reason for it not to start is connection to the coil I see this all the time go to the coil connection and have some one crank it while you wiggle it and see if it start then.now if it still doesnt start youll just have to test for spark and if there is no spark your best solution is to replace the whole distributor why because there is a relector that has always failed even when it gives spark. and fuel because as a timed unit it gave fuel and spark at the wrong time here use the picture included in #1 wiggle connection #2 check for sparkcansmo_0.png

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99 yukon 180,000 mi. doesn't start. cranks forever, but won't start. Should I be able to hear the fuel pump when I turn on the key?


yes you should be able to hear the fuel pump run for about 5 seconds once the key is turned to the on pos. check to make sure you have spark. if you do try having someone spray air intake or carb cleaner into intake manifold while you crank. If the truck starts right up for a second (or stays running as you keep spraying) Id say you have a bad fuel pump and id change the sending unit also. (First check the fuel pump fuse and fuel pump relay) GMC and Chevy are nororiously known for having bad fuel pump/sending unit problems. I have prob changed over 60 myself.

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