|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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|03-04-2011, 01:37 PM||eBay Motors #1 (permalink)|
Join Date: Aug 2010
Hard starting when hot
i have a 2003 gmc 2500 hd lb7 w/cal.emmissions completly stock 75000 miles
about 5 months ago i had a check engine light
code said glow plug
replaced "all 8 glowplugs" i cant be sure. After that it was hard starting.the dealer said they would diagnose it for free. In 3 hours first it was the fuel regulator then they called and said it was the injection pump and if i put up $1500 they would replce it and if that wasn't it they would give me my money back.i won't pay for parts changers
i took the truck home and found the short fuel line off the filter was cracked i replaced it and all was good for 2 months
now it starts cold after 5 second of cranking but when its hot it will crank but not start
any ideas out there
thanks for reading
|03-04-2011, 06:04 PM||eBay Motors #2 (permalink)|
Join Date: Dec 2006
Having the same problem, dealer changed all injectors . No help with the start issue.
Added megafilter and lift pump. No help with start issue.
Changed most rubber fuel lines. No help yet.
2003 GMC 2500HD utility stock
|03-05-2011, 03:25 AM||eBay Motors #3 (permalink)|
Join Date: Sep 2008
Location: Beer Tent Capital of the World
ZBM2's sounds like a classic case of injectors.
Personally I would put up the $1500 and let them put an injection pump in even though it might not be bad "they said they would not charge if it did not fix, and you get a new pump for nothing "
The reason they think the pump is bad is it probably will not reach commanded Mpa of at least 158-160Mpa. Shoot I put a new injection pump in a truck that at idle was around 26Mpa "3900psi", and at WOT could only muster 39Mpa "5800psi, that is just a little shy of the commanded 23000psi" Shoot this truck at WOT could only max out a little over what mine does at idle, and it never had a hard start condition
2003 Chevy 2500hd crew cab 4x4, D/A
Just a few aftermarket goodies