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  1. #1

    Default 2000 GMC 4.8L Codes PO300 & PO351,2,3,4,5,6,7,8!!!!

    New here, Hi to all. I've replaced the following with no luck.....coils, wires, plugs, fuel pressure regulator. Fuel pump press at the sending unit is 60+ lbs. Don't have a tester for the fuel rail yet. Motor starts right up but has a miss, checked all plugs with a ign tester, all fire the same. Sprayed ether on the intake manifold....no change. EGR seems to be free. Unplugged MAF.no chqange. Seafoam in tank...nothing either. Any ideas?? Thanks in advance, Mitch.

  2. #2

    Default

    Fuel pressure @ the fuel rail is 46 at idle and 55 with the hose off of the fuel press regulator( which is new NAPA). Injectors measuring 12.8 Ohms.

  3. #3

    Default

    P0351-p0358 is the coil packs code.. so it could be a bad ground wire.
    -Jonathan
    2000 ECSB Silverado 2WD
    LQ4 with Isky 215 Turbo Cam
    4L80E KB Racing S475 Turbo Kit

  4. #4

    Default

    Finally fixed the missfire......INJECTORS! Now when ever I start the truck after about 2 minutes CEL is on and 0351-8 is the code. Truck doesn't even have to be running. I clear the code, shut it off..turn the key on several times leave it on a few seconds and there it is....0351-8. Would the truck still run OK with a bad ground? Thanks.

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