I could post up some vid if that would help?
I could post up some vid if that would help?
this would make allot more sense. Maybe its to loose or tight. post vid, I bet we can all figure this one out together. or not lolOriginally Posted by SCIV
Side thought...belt slip at high RPM?
but it seems like the pcm might have learned wrong or somthing. Just a theory but lets say you get a nelson tune, and somthing is wrong but not noticeable. like a sensor that is reading incorrectly. Wouldent that make the relearn mess up because it had currupted data? truck relearns but with the pretence that all is well. does this make sence guys? Maybe a stock pcm would unmask the problem, if its not a stated problem. Or I could be full of it.
Last edited by ff_jeff; 11-09-2007 at 12:38 AM.
when i had my tuned pc and i bent a valve surpirsing no knock sensor codes, or and codes at all, and when i broke my rocker arm 2 nights ago ( witch im working on at the moment ) no missfire codes, so ob2 dosnt always find the problem
I can see that but the last mech said he pulled two plug wire's and still no code. Any reason's why that wouldn't shoot a code? I got a cam and a crank sensor. I'm going to install them and see what happen's.
Do you have the crank pulley pinned? The pressure from the blower may be spinning the pulley on the crank. How many PSI are you running?
Jamest
12 Sec. Club! SOLD
La Viuda negra/ a.k.a. Black Betty
LQ4 6.0L, WCCH HEADS, LEVEL 5 FLT 4L80E TRANS. WITH TRANS BREAK, YANK 3200 STALL, TRICK TURBO, TURBONETICS T-76 TURBO, CUSTOM INTERCOOLED, 68lb INJECTORS, CUSTOM S/D TUNE FROM NELSON PERFORMANCE, COMP CAM 212/214 .557/.559 116+2, SNOW METH. KIT, . ALL INSTALLED AND DYNOED AT NELSON PERFORMANCE: 5**?HP @ 5073rpms and 5**TQ @ 4389rpms AT THE WHEELS WITH 10 PSI OF BOOST. ALL 3/4 TON TRUCK 5435LBS, NOTHING TAKEN OFF, STREET TIRES, AND USUALLY 2 BABY SEATS. WANNA RIDE?
SOLD***
Fuel pressure test/verify: Pressure looks good on the schrader valve, but are the injectors just clogged? Maybe you finally scooped up enough poop from the tank to slowly build up in your tiny injector holes over time. PLENTY of pressure...on the goop-side, but no gasoline can pass through them into the engine. i dunno what to do about that, known good stock injectors might lead to dangerously lean condition(i am not versed in blowers)
Done compression test to verify rings/valves/headgasket?
Do the RPM's drop when you pull the wires? If not they are either 'dieseling' from bad timing/too hot temp and just firing without spark lol OR that cylinder is dead as a doornail and wasn't doing anything to begin with. Get ahold of the misfire enable criteria or conditions are for the "misfire" code that should be showing up.
1991 Silverado ECLB
LM7-T56
Same line of thought I have. Belt or pulley issue. It would show up on the boost gauge though.
Gone, but not forgotten!
It still runs ok I mean better then any stock truck, if I ease into it and don't give her more then half throttle. The belts are good and I am setup for 5 psi of boost and when cold it will run decent with boost. I replaced the crank sensor no dice there. I am going to try to get the camshft sensor in today. I will also get some vid up later today.
??? Can you enlighten me. Why only .030?
i had a problem with pulsator in the tank being ripped, and wile under a load it would loose pressure, i know you have a new pump but they usaly dont come with the pulsator, i replayced it with just rubber hose
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