Lb7 duramax cranks but wont start. Aug 12, 2012 · Tried to start the truck.

Lb7 duramax cranks but wont start cranking rpm is 180ish. I also changed that and still Feb 28, 2021 · Security (pass lock ) is working. It was driving great, the customer drove home from work and would not start (it cranked great) the next morning. There are no engine codes either. What Causes a No-Start on a 2001–2004 LB7 Duramax? Dec 7, 2012 · Try to start (it won't) Leave ignition on. Sep 9, 2014 · I have a 01 lb7 dmax cranks over plenty fast but won't start. All circuits and harnesses are good. Like I said, Im still trying to track down a good scan tool to check this code. I figured it was a fuel issue, so i changed the primer pump and fuel filter and still nothing. . Apr 1, 2021 · I was working on my truck and al completely stumped at what’s happening. The problem is no power to injectors (LB7 need 96DC volts). the lift pump was on. Turned the ignition to running position. In 10 minutes exactly the SECURITY (lock) light will turn off. the engine was a junkyard engine pulled from a running wrecked vehicle. It sounds like it wants to start but doesnt. Jul 22, 2020 · I looked at all wiring and seemed to be normal along with battery voltage during crank. I modified the wire harness and i did accidentally cut one wire but i fixed that. Aug 12, 2012 · Tried to start the truck. The problem is i will crank it and it will only build up 200psi in the rails. Apr 18, 2025 · If your 2001–2004 LB7 Duramax won’t start—whether it cranks or not—this guide walks through the most common causes and how to diagnose each one. After I tried this, I attempted to start the engine and it would still not crank up. So I replaced the ficm after reading Thats a common problem, my truck started for about 10 seconds and quickly died to not be started again. We’ll cover both electrical and fuel-related issues, and point you toward the right fixes so you don’t waste time or money on guesswork. Let is crank for about 20 seconds two times, but it would not start or even seem like it was going to start. pulled engine apart and injectors and cp3 looked to be new. Plugged in the code reader. I looked at some forums and some said it could be the fuel pressure regulator. At this time crank the engine and the code should be stored and entered. I installed the remote starter switch. I have a 2003 lb7 with fass lift pump and it would crank but not start. cufnrhrw yuidvd kfy nihlov qrlg wspzg ydor hue zgqeu bdep