2005 GMC Duramax won't start.

hemibadfish · 09-27-2007, 05:23 PM

I have a 2005 GMC Duramax diesel and have recently been having a no start problem. Last week I parked my truck in the evenining, the folowing morning it would not start. It turned over great but would not fire. I checked the electrical connections under the hood and tried again, still would not fire, primed the fuel filter and tried again, still wouldn't fire. Finally had the truck towed to the shop. They hadit for the day and said the found a bad connection in the plug connections under the hood. Took the truck home, ran fine, next morning started fine and ran well all day. Parked it Friday evening, went to start it monday morning and same thing, turns over well but won't fire. I unplugged the connection they had told me about and retried after every check I made, wouldn't fire. Had it towed to the shop. They said after it was unloaded they tried it and if fired right up. Ran fine that afternoon, parked it that night and started it the next morning, ran fine all day. Parked it at night, next morning it wouldn't start. Repair tech came to house late afternoon, tried it and it fired right up. Truck is currently still at the shop as they have not been able to determine the problem. Anybody else heard of such a problem?? The truck does have an Edge chip in it, we removed it from the system and tried to start it several times when it wouldn't go and it still wouldn't fire. The GM shop could not find any codes on their scanner any of the three times to help with diagnosis either. Any help or suggestions would really be appreciated.

Thanks

tref · 10-04-2007, 07:48 PM

when my 04 lb7 did that sim. prob. i took it to the dealer they replaced a kimked fuel line on top of eng that goes to the pump but that did not solve the prob i simply started using the other ign. key truck has stsrted & ran fine since

**ob_1jr** · 10-05-2007, 09:58 PM

Have a look at the #2 and #7 injector harness, they are known for chafing and there is a TSB out for it. When is the last time you changed your fuel filter? Are you able to pressurize the system with the primer and not cracking the bleed screw? Those primer pumps have been known to go bad and cause problems.

unclebob · 10-17-2007, 05:26 AM

I had the same story, just the way you described it-the dealer could not find a problem until I had them park it on an incline. Two hours later the truck would not start-no fuel pressure. They said the problem is the fuel filter housing. They said it would take 2 days for part to arrive. I will let you know it this fixes the no start problem. My truck is a 2006 Duramax.

Electric Boss · 10-17-2007, 03:10 PM

Ok, I'm no mechanic & I'm sure you guys have it covered but if you all remember on the 02's they had an injector problem. My 02 had the defective injectors & it would do exactly as you are describing. It drove me crazy. The quick fix that usually worked, not always, would be to loosen the screw on top of the filter & prime it until fuel came out. Might try that.