hey guys. earlier today i started my truck up coldish(80* oil temp) and it started just fine like normal. i let it start warming up and after letting it run for about 15 seconds of idle time it starting working itself into a slight lope. it has done that for awhile now so i thought nothing of it. well it worked into a small lope like normal, but this time wasn't like other times. normally it will work into a little bit of a lope for a couple seconds then go back to smooth idle. This time it kept loping worse and worse and worse. the engine was popping hard enough that there was smoke just misting out of the stacks pretty good. i took the RPMs up to around 1400 RPM and it just kepting doing this all the way up to 1400 RPM. so i took it up to 2000 RPM and it smoothed out SOME, but not much. looked back and smoke was just about pouring out of the stacks(black smoke), but i wasn't being hard on the throttle at all. just barely touching it.
Let it idle again and unplugged the ICP
. the engine popped one good time as soon as i did that and then went right back to being dumb so i plugged it back in. during this whole time ICP
appeared to stay normal, but IPR
DC% was fluctuating between 12-20%. i switched programs on the chip, no change except for idle speed. turned the truck off, then back on about 10 seconds later and no change, it was still idling crappy and smoking slightly. took it out on the street in street race and went to accelerate.. ICP
jumped up to 2900psi, but the truck DID NOT move for chit. it was like there was no fuel there. i looked behind me and there wasn't any smoke. so now i'm thinking to myself like what the hell is going on? i switched tanks to the rear tank and let it idle and after about a 20 seconds it started idling smooth(now oil temp is only 128*). so i took off and fed it some of the ole right foot and it took off like a crazy mother just like it normally does and left a trail of black smoke everywhere since i was in my street race tune. drove it a few miles then back to work and it ran perfectly fine. got back to work, switched it to the front tank of fuel again and everything was fine. let it idle for about 5-10 minutes and it idled smooth and revved nicely the whole time i let it sit there idling. so now i don't think it's a front tank problem as i'm not getting that problem now on the front tank. NO CEL
was set this whole time either
I'm wondering if this could be connected to a problem i had yesterday. yesterday i was doing some testing and lugged the engine down in 5th gear @ 1200 RPM and as the boost started to come on it set the CEL
and lost a little power.. Not much power was lost, but i found that the ICP
was low(maxing at 2000psi instead of 2600psi), boost pressure was 5lbs lower than normal, and at idle the ICP
was higher than normal @ 1000psi. unplugged the ICP
and NO change in idle(was idling a little rough, but not bad at all. just could tell it wasn't QUITE right). plugged the ICP
back in and pulled the codes and got these--- P1280, P0113, P0478. haven't looked these up yet to see what they were. i turned the truck off and then started it back up again a few seconds later and everything returned to normal. ICP
was normal, full power was back, normal boost pressures, and normal idle.
So, any thoughts guys??????