rrustedcummins00 |
04-28-2014 11:33 PM |
idle, lope, timing issues?
Hello,
This thing has me stumped, I guess I'll start off by saying it has an industrial injection hot rod pump, its been giving me drivability issues for months now. It started as a miss when idling once every couple min. Progressively got worse over a span of 2 months or so. Now it's a full out lope, it does it throughout the entire rpm range, making it a pain to drive. 5speed converted from auto. It has its days where it will high idle at 1400 when I push the clutch in or come to a stop. If I drag the motor down it will idle around 900, higher than it used to. And sometimes it will idle it self back up to 1400 before I take off again. It has terribly loud injector knock like the timing is way advanced at any rpm below 1600. Had a bad crank sensor, replaced it. No change, no cel. I rewired all the grounds, swapped out the apps. Nothing changed it. Today I hot wired the vp pump. Still loped, no high idle. Well it stayed around 900 at least. Put clear fuel line on, no air. Oh yeah also has new head gasket and 150hp injectors. Lope actually got worse after new injectors. Also the throttle is very touchy, like from the timing a smartly will give. Anyways I put an analog volt meter on the pump tap wire and you can see the lope through it. So it seems as if the fpcm is commanding this rough idle. Here's the strange thing, just out of the blue we decided to drain my fuel filter and fill it with trans fluid. Started it up and as we watched the red trans fluid through the clear line enter the vp44 the idle smoothed out and went to normal rpms. As soon as the fluid began to look more green the lope and higher than normal idle speed came back. This thing is a headache and I'm out of ideas of what it could be. Any help is appreciated
|