Question about 2003 GMC Sierra

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03 sierra 4.8 engine swap with an 06 4.8 starter will not engage ,feul pump does not engage nothing in dash works.

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Did the battery cables get connected? Did you get all your ground wires installed properly? Are all of the wiring harnesses plugged in correctly?

Posted on Apr 11, 2011

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Posted on Jan 02, 2017

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Good battery, key will not engage starter, jumping starter will not engage drive


jumping across the solenoid will spin the starter but will not engage the pinion in the ring gear. Have a load test done on the battery as I suspect that there is a bad cell and you are not getting a full charge. If the battery is faulty then there is always enough power to turn on dash lights but nothing left to run the high current solenoid and starter.

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I have a 1993 Chevy 1500 Silverado 5.7 worked. I changed the feul pump and feul filter. When you turn the ignition to the on position you do not hear the feul pump engage and there is no feul pressure at...


Yes, it can be the relay. What I do is unplug the relay and swap it gor yhe horn relay. If this doesn't work, I use a volt/ohmmeter to probe the relay socket. Doing this, I can usually find the problem. With the key on , there should be two terminals in the socket that have battery voltage and one that is grounded. The last terminal goes to the pump and should show low ohms to ground. In your truck, the relay coil is connected to ground and turned on by the ecm with a positive signal. It also seems to depend on the oil pressure switch, so you might want to temporarily bypass the switch with a paper clip in the connector to see if that is keeeping the pump from running.


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1988 gmc sierra s-15 feul pump/feul delivery system,how it works.


start checking fuel pressure easier then changing pump re check that all is plugged in by air cleaner

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2001 GMC Sierra, 4.8 occasionally wont start.


sounds like starter solenoid,try cycling the ignition on start on start repeatly but do not go back to the off position off on start will activate the fuel pump repeatly and might flood it,with a faulty solenoid you can usually cycle the ignition repeatly and it will finally engage the starter

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When you have no spark only it could be the ignition module. when you have no gas delivery only it could be a relay. However when both are missing. It is either your crankshaft sensor or the engine computer. Good luck. also see if the injectors are pulsing.

Dec 28, 2008 | 1996 Isuzu Rodeo

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