Question about 2000 GMC Sierra

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2000 GMC Sierra 4.3L no spark at the plugs...HELP!

Yes, I need some help here. Before I here "change the wires" or "change the coil" let me give you a list of what has been changed thus far:

  • Wires including coil wire,
  • coil,
  • ignition module,
  • plugs,
  • distibutor cap and rotor cap
No fault codes on the code reader. Any thoughts?

Posted by on

  • DWSledge Sep 25, 2008

    Where is the computer....inside under dash? Sounds like a silly question but I don't know & haven't looked.

  • DWSledge Sep 25, 2008

    Thanks, I'll let you know. Also, have you heard of a crank sensor causing no spark? Someone said that the crank sensor sends a signal to the computer which sends a signal to the ign module to let spark to the distributor??? I don't know the order of ignition sequence or what part does what first.

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  • 125 Answers

No codes. most direct components changed.
computer. take it out or have the truck towed to the shop/dealer to test the computer.

Posted on Sep 25, 2008

  • 1 more comment 
  • bryant smith
    bryant smith Sep 25, 2008

    before you check the computer. check the relays and fuses. if you haven't already.

  • bryant smith
    bryant smith Sep 25, 2008

    front left engine compartment by the battery

  • bryant smith
    bryant smith Sep 25, 2008

    that is correct a crankshaft position sensor sends a signal to the computer to let it know where it stands (what piston is in what postion). hense the firing order.

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Went to the dealer & they gave me the ignition troubleshooting tree. Had voltage, ohms, pulsing, etc. where it needed to be. Still would not start. Just for the hell of it I removed the connecter on the back of the distributor & it started!! Ran rough so I put the connector back on along with the air intake. Ran smooth. I let it idle for an hour, no problem. Drove it around town for two days but yesterday the truck died agaion leaving me on the side of the road. Got a tow home, tried the same thing with the connector, no luck but the truck did start, rev'ed high then died. Did this 2-3 times and then nothing. Engine just cranks over with no start. Going to have it towed to the dealer today..........

Posted on Sep 29, 2008

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