Question about Chevrolet C3500

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1999 K3500 7.4 genVI wont start. Fresh motor, built myself. New coil, dist,cap, rotor, wires, etc. Ran fine for one day then died while driving. Cranks but will not run. I verified fuel pres at rail 55 psi, spark at plug, comp is good. Re-checked all timing, verifing comp stroke TDC and wires to correct location, tried moving dist 1 tooth each way. Verified all sensors to be conected. Plugged in to Mac tools Mentor and get no fault codes. did relearn of timing, etc. Still cranks will not start, occassional pop back in intake or out exhaust. pugs wet with fuel. rerplaced plugs again still no run. AC Delco double platniums at .060 gap. Service engine soon light is on. 3 full time professional mechanics in my family and none have been able to solve the problem.

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  • Master
  • 2,309 Answers

Just a thought, remove valve covers and check lifter action, also check compression

Posted on Aug 03, 2010

  • 3 more comments 
  • Dave Blakely
    Dave Blakely Aug 03, 2010

    Compression is good. I did a leak down and all was good. New cam zz502 GM performance cam. replaced everything except ign module located next to coil on same bracket. New distributor. High end cap, rotor and wires. Remember it ran one day and then cut out and died the next time I drove it..

  • starrface Aug 03, 2010

    maybe try a fresh fuel supply?? could be contaminated, when you get it running let me know what it was, now i am really curious,could be flooding itself, but now i'm guessing

  • Dave Blakely
    Dave Blakely Aug 04, 2010

    I will work on it tonight. Called and got another new distibutor, going to warranty it and the spark plugs out. I also plan to hook up a fuel injection flusher and run some BG 44K through it. This will insure the injectors are clean and verify if it is contaminated fuel.

  • Dave Blakely
    Dave Blakely Aug 06, 2010

    Warranty distributor had no effect. A closer look at the quality of spark made use grab a stock coil/module on the bracket off another truck in the shop. Fired right up! I guess SUMMIT will be getting a call. Replaced the coil from a local parts house, fires up everytime now. New issue still related I believe. Can not get cam ****** to 0*. The closest I can get it is -2*. If I advance the dist one tooth, I can't get it back below 18* with it rotated to the max the other way. Timing chain was set up with 0 degs on the cam. Replaced crank angle sensor , no effect. This is crazy!!!!

  • starrface Aug 06, 2010

    thanx for staying in touch, i'm not gonna rain on your parade but i'm glad you got it started, you will solve the timing thing,so good luck

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