Question about GMC Yukon
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
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
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
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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Posted on Jan 02, 2017
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