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2001 1500hd Will Not Run

tsidders

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tsidders Enthusiast

tsidders

Posted
Posted

Hi all

this is my 1st post so be gentle...I Have a 2001 1500 HD with a 6.0L(150K miles) and while driving the truck today, it completely stalled while at a stop light. I was able to get the truck up and running but barely....it appears to be only running on a few cylinders and the only code I can get it to pull is P0300 multiple misfire. I thought it may be a bad coil but it should at least idle if only 1 or at the most 2 are bad...I can't get the truck to even idle at all. It will only start if I keep the rev's above 2k rpm, and it stumbles and bucks badly. I checked the fuel pressure as well and the pressure is around 50psi +/_ above 2k-3k rpm, What is the proper fuel pressure supposed to be? Any ideas what else the problem could be?

Thanks

Tim

SinisterSS Enthusiast

SinisterSS

Posted
Posted

Easy - had this happen on my truck identical to yours this summer. Identical symptoms, same trouble code. I bet it is hard to start when the engine is warm too eh?

 

The check and fix - On the left (driver's) side of the intake manifold, pull off the small vacuum line going to the fuel pressure regulator. If fuel runs out of the vacuum line, the regulator is bad. It's a simple 5 minute fix (held on with only the little spring clip).

tsidders Enthusiast

tsidders

Posted
  • Author
Posted

Took the truck to a local shop where they have diagnosed that the cats are supposedly bad(clogged)...They claim the cats both got red hot once they got it running and so they dropped the exhaust off the manifolds and it will now idle on its own and on all 8.....Will the fuel pressure regulator cause the same simptoms? The shop wants to replace the whole exhaust from the manifolds back........$1800!!!!!!!

ws6_guy Senior Enthusiast

ws6_guy

Posted
Posted
Took the truck to a local shop where they have diagnosed that the cats are supposedly bad(clogged)...They claim the cats both got red hot once they got it running and so they dropped the exhaust off the manifolds and it will now idle on its own and on all 8.....Will the fuel pressure regulator cause the same simptoms? The shop wants to replace the whole exhaust from the manifolds back........$1800!!!!!!!

 

no no no dont let them do the exhaust, go & get hi-flow cats installed somewhere else since cats is all the problem should be. and with the rest of exhaust buy a catback or something w/e you would like. Dont let them charge you that much for a stock exhaust

wellinghurst Enthusiast

wellinghurst

Posted
Posted

No way should you pay $1800.00 for exhaust. If that is indeed the problem, just buy new cats and if you want, a new muffler while you're at it. If you buy the parts online, you will save a ton. If you have to pay someone to put it all on, it shouldn't be more than 200-300 bucks for labor. You can get a decent muffler (if you need/want to even replace the muffler) for about $100.00 and decent cats for $100.00 or so each too. If you look hard enough you can get it all done for $500-700 bucks, with labor. I would say your muffler and pipes are fine though.

 

Tell them you'll pay 1800.00 for new exhaust and a '97 Malibu (I just sold an old car of mine for $1200.00).

 

No 150k truck needs a $1800.00 exhaust-unless you are making a show truck.

SinisterSS Enthusiast

SinisterSS

Posted
Posted

It's hard to diagnose over the internet but reason would say that the cats are red because it is running lean due to low fuel pressure.

 

Troubleshoot and fix the root cause...the first test is putting a gauge and measuring the fuel pressure at the rail.

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