Hey guys, new to the website. I just bought my first Duramax a week ago, and I already ran into a problem. I'm relatively new to the diesel world, and I found this site dedicated to Duramax's. Hopefully someone can help...so here's the deal:
I was driving my 2003 Duramax on the freeway and all of a sudden it lost power. The vehicle wouldn't go over 30 MPH, so I pulled over, raised the hood, looked over the engine, and saw nothing obvious. I got back in the truck, shut the engine off, waited a half hour, started it back up, and continued to drive. I made it back home, and the check engine light was on. I let the vehicle sit for two days, and started it back up. The CEL light was off, and it seems to be running okay now. Any idea what happened?
Hopefully I'll stick around here awhile. Thanks in advance for any help.
Could be the fuel filter. Do you know the last time it was changed? also another thing to watch for is the LB7 motor is known for having injector probs. so check your oil and make sure its not over full and dose not smell like diesel. There is a 7yr-200,000mile warranty on the injectors. Also welcome to the DF...
__________________ Craig
2001 Chevy, 4 door, short bed,D-Max, 2 wd.
Mods.. straight piped exhaust,
Custom dent and scratch in passenger side rear panel..
Special Thanks goes to the person in the WAL-MART parking lot for installing it for me,
Welcome to the site, I am going to agree with Deeretracks check filter and warranty on injectors, but do filter first
__________________ 06 2500 CREW CAB 4X4 LBZ
4" DIAMOND EYE EXHAUST, KITTY RAN OFF!!!
DIABLO @ 120HP. 285/75 BFG's RUNNIN ON ULTRA 16's
PIONEER HEAD UNIT RUNNIN SCOSCHE AMP W MTX TWINS
AIR BOX IMPELLER REMOVED!! RESONATOR PLUGGED !!!
AUTOMETER ULTRALITE GAUGES IN POD. TRANSGO JR WORK RIG
O7.5 3500 CREW, LMM, ROYAL UTILITY BED
4" DIAMOND EYE EXHAUST.DPF???KITTY?? QUADZILLA PROGRAMMER. MTX AMP AND 10" TWINS IN THE BACK. STEPS,VISORS,BUG SHEILD. AIRBOX IMPELLER REMOVED,RESONATOR PLUGGED,LOTS OF PRETTY DIAMOND PLATE EVERYWHERE
Amsoil-Air Filter, motor oil, both Diff's, Tranny, Tranfer Case Autometer C2 0-35boost and 0-1600temp gauge Cooper STT Tires 285/75-R16 PPE Boost valve Single Flowmaster 4" with a SS 5" tip, two Interstate battery 800 CCA
My Wish list!EFI Live V2,HD tie sleeves, 5" Exhaust, Airdog 150, BD Manifold, Suncoast IV, Water/Methanol injection, AFE cold air induction Guard 7, 71.5 mm cheetah and about 12,000 bucks for the goodies!
What mods are done to the truck? If you have a K&N or any cotton/oil filter that could be your problem. The oil anf fibers are getting on the mass air sensor. Also go to an auto parst store or mechanic and have the codes read. Even though the light is not on the code is still stored as an inactive code. Hope this helps
Martin
__________________ 2008 GMC Sierra Crew Cab 4X4 334 hp and 599 ft/lbs on 24 Aug 2008 at Meridian Motor Sports Meridian Idaho.
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2004 LB7 Crew Cab 4x4 SLT 
Linear Mode
