Question about 1992 GMC Suburban

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No spark I havea 1992 GMC Suburban 4X4 with 5.7 eng. it will not start I have replaced the fule pump and relay I have had the coil and modual checked ireplaced the compuer it still want start I can't see any spark out of the coil when canking it over I was told eveything gos though the computer any chance the one I just got is bad.

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  • oldgrizzly Nov 02, 2008

    I cheked the ground at the fuel tank I cleaned where it grounds. Ihave also checked several other grounds. My Suburban had a bad miss befor it died I was told by one mechanic I had a bad fuel pump and a second GM mechanic said it was my computer going bad.But now That both have been replaced I still not getting spark. I see there is box mounted inside on the firewall drives side and it looks to have a fuse and relays whats it do.

  • oldgrizzly Nov 04, 2008

    Well for all you out there that are having the same problem I have, check your main harness junction block, you see I live in the desert where it gets 120 to 130 on the pavement and setting in traffic the engine compartment gets even hotter. Orer time the cheap seating compound that GMC uses stars to melt and seeps into all the connectors causing them to loose contact. I have had some electrical problems for the last 3 yrs. and four shops could not figuar out the problem. Some have even said it's easyer to find after it dies. So if your GMC has unexplained misses and hesitates under aload try opening up this connector block it only takes a 1/4" socket to remove the bolt in the centerof the block. This about drove oldgrizzly nuts but I just had to share my find.

  • oldgrizzly Nov 17, 2008

    Still not starting



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Check grounds. The computer can have signals going into it but with grounds the signals do not come out of it. There is a chance that you may have gotten a bad one. Check the O2 wiring harness' and make sure you don't have a burnt wire from it rubbing. I had a Chevy pickup in my shop once and found a bad ground at the rear coming off of the fuel pump harness keeping the truck from starting. At the computer, check the wiring harness for loose or frayed connectors as well.

Posted on Nov 02, 2008

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