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03-lb7-cali emissions- stock-removed vac pump- running a lift pump
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Discussion Starter · #1 ·
Lb7, put 8 Bosch reman injectors in two years ago . Balance rates are normal except injector 1 is +15. Getting an intermittent misfire code (p0301). I’ve checked compression. I’ve checked resistance on the injector harness..and I have no noticeable smoke or knock. The truck seems to run fine. It doesn’t accelerate well beteeen like 20-45 mph . Buts the acceleration been like that since before the injector replacement , and. Is common in Lb7’s . Any ideas?
 

· Former GM Tech and parts
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If it is +15 it’s trying to add fuel to that cylinder. If the compression is good, the solenoid tests good, then I’m guessing the injector is clogged with something. If you do a cylinder cut out test, it may not change the running of the engine at all when you kill that injector, indicating that cylinder isn’t getting enough fuel. Either clogged or broken internally would be my guess
 
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