|01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect|
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|05-12-2012, 11:35 AM||eBay Motors #1 (permalink)|
Join Date: May 2012
2003 Duramax won't start when hot.
I have a 2003 2500 HD that will not start when hot. It starts fine when cold and runs great. No smoke and plenty of power. Once the engine heats up if you shut it down it won't start for at least 2 hours until completely cooled off.
I have taken it to the GM dealer who tested it and said it might be the injectors but he wasn't sure as they all tested fine. He couldn't find the problem. The only thing he did was replace the pressure release screw on top of the fuel filter housing. That seemed to help a little for a short period of time.
I have replaced the fuel filter (GM produce) five times in less than 100,000 miles so I don't believe that is the problem.
Any ideas how to fix this problem?
Last edited by Bhenriksen; 05-12-2012 at 12:49 PM.
|05-12-2012, 11:52 AM||eBay Motors #2 (permalink)|
Join Date: Jul 2011
Location: Indiana, USA
Have the return rates on the injectors checked. I heard this has been other peoples problems.
2003 LB7 2500HD ECSB
-Edge Evolution CTS
-MBRP 4" w/ 5"tip
-Banks Ram Air
-35w AGT 6000k HID's
-5% tint allaround
-285/75R16 Michelin LTX A/T 2s
-340k miles and counting
|05-12-2012, 01:46 PM||eBay Motors #4 (permalink)|
Join Date: Sep 2010
Location: Saint Johnsville, NY
I would say injectors returning too much fuel is a good possibility also. Do the bottle test when warm, and try a good injector cleaning. There are excellent writeups here about both.
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|05-12-2012, 02:27 PM||eBay Motors #5 (permalink)|
Join Date: Jun 2008
Location: So. Cal
Common problem with bad injectors on the LB7 engine. When the engine is warm, they by-pass to much fuel, and the rail pressure is low.
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry