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02' silverado 2500hd 6.0L cranks but wont fire

Demerson

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Demerson New Member

Demerson

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Hey there, so Im kinda new to this. But I just bought a 2002 chevy Silverado 2500hd with the 6.0L V8 2 weeks ago. Its got the 5 speed manual trans 5in lift running LT 285/75R16s. Well over the weekend I hauled my car trailer down to North Carolina for an auto auction. Made it down dropped the trailer went to the auction got my buyers badge ate the free dinner and went to the hotel. Got in to the room unpacked then went back to the auction. Truck ran great this whole time....the next morning I went to go start the truck and it started and ran for a few sec. then shut down I hoped out purged the fuel rail and started it up again. made it over to the diner for breakfast I parked in the lot and let the truck run for about 5 min. then all of a sudden it shut off again. But this time it did not restart. Had it towed to a shop replaced the fuel filter, all new spark plugs, new crankshaft pos sensor and a new camshaft pos sensor. Still no fire. tested all fuses and relays all are good. Tested the fuel pressure and iv got 55psi with the key on and then 60psi when cranking. So it was time for the shop to close so the truck stayed locked up inside while I waited on my buddy to bring the other truck down to get the trailer and the broken down chevy. Well we get the jacked up chevy on this tiny 24ft car trailer with weight limit of 6500...and a new Silverado 1500 doing to pulling...the 1500 got 2 days after the 2500 and it didn't like to have to do the 2500's job of pulling. Anyways get the trucks back to VA was just going to drop the 2500 off at the dealer but while I was filling out the form for the drop box I told my wife the try and start the 2500 for the hell of it. It back fired twice she tried again and it started up just fine so I said shut it off and start it up again and we did this about 5 times to the point where I jumped in the truck and drove it home. The old girl that has 190,005 miles ran the best she ever has (iv known this truck for years it was my grandfathers hauling truck) I figured all it needed was just a good tune up. Get home turn it off and tried to restart and got nothing only crank and no fire. This was yesterday, I went out today and tried to start it, it back fired twice tried again and it started but had a really loud valve ticking noise so I was just gonna drive it the dealership and just as soon as I was going to release the brake and put it in first it shut off again. Has yet to restart...I need help please iv already put a lot of cash in it and cant afford much more.

03'Silverado2500HD Enthusiast

03'Silverado2500HD

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Did they clean the throttle body and mass air flow sensor. I have a 03 that would run like crap and stall sometimes/ not start. Had a shop fix it and all they did was clean the throttle body. Now it runs like a new truck.

Demerson New Member

Demerson

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I have not but I did just replace the ignition starter switch (the wiring harness that runs down the steering column) and the truck started up just fine run great so I shut it down and did it again started and ran great did that 5 times then let it run...it never shut off. So I shut it down put everything back together and started it back up it ran for about 5min then shut off and wont restart. Im now almost 400 $ deep and cant afford much more

Demerson New Member

Demerson

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Well I might have gotten it figured out I pulled the connectors off my PCM and sure enough they had water and dirt inside

03'Silverado2500HD Enthusiast

03'Silverado2500HD

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Well I might have gotten it figured out I pulled the connectors off my PCM and sure enough they had water and dirt inside

I would suggest cleaning it even if it runs after you clean the connectors on the PCM. You might get better fuel economy and better throttle response. A can of throttle body cleaner and MAF sensor cleaner isn't that much and can save you from replacing the MAF if it gets to dirty.

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