Join Date: Jan 2018
Feedback Score: 0 reviews
Well, the problem happened again today on the way home from work. And it did for a pretty long period of time, so I was able to get some numbers on the PID's and more info.
So as I was driving around 55mph, the truck felt like someone had just quickly pressed the gas pedal for a spit second...just a quick jerk. It did it a few more times after that. The Throttle Position PID reading stayed steady when this happened, right around 20%. So the ECU wasn't sensing that I was calling for more throttle.
Then after a few miles, I let off the gas to make a turn....and I noticed that as I let off the gas the injectors sounded a little funny, and the truck wanted to idle fast. It held the idle at around 920rpms (usually it's around 650), my IPR rate was at 34.0% (usually it's at 22.8 during idle), and my HPOP pressure was 640psi (usually it's around 580 at idle). FICM voltage was 49.0, and battery voltage was around 14.2v. Even after getting on the gas several times, every time I let off.....it would fast idle. But, the idle was smooth...not rough an erratic. Just a higher than normal idle. Could the IPR be sticking? Not sure why that would explain the weird injector sound though while I was off the gas and coasting.
I drove for a mile or so, and the truck just felt weird. Every time I would let off the gas and coast the injectors would sound weird (like every other one was off or something), and it would idle fast. When I would get on the gas, everything would sound normal......but it just felt odd.
Jut as I pulled in the driveway thinking I could finally do some troubleshooting......I feel the idle drop back down to normal, and everything is fine. I couldn't get it to duplicate it no matter what I tried. Like before, I scanned the ECU...no error codes. I ran through all of the PCM, and Injector Click tests that I could run with Forscan, and they all showed good. I could hear each of the 8 injectors click like they should, nothing sounded odd.
After the idle went back to normal, I climbed up on the truck and pressed around on the FICM connectors, every section of wiring loom I could find, and every socket and electrical connectors and sensor I could find....nothing. No blip in the idle, no increase or decrease in idle speed....nothing.
With this new info, any ideas??? Would a bad ground cause this higher than normal idle issue?? Could this be a sticking IPR? That might explain the high idle, but it wouldn't explain the strange injector sound. Failing FICM?
Thanks so much for the help guys!!
2005 F250 6.0 PSD, ARP Studs, Felpro HG's, EGR Delete, IPR Coolant Filter, Bilstein 5100s, Blue Spring Mod, IDP Custom Tunes
Last edited by iqraceworks; 08-24-2019 at 08:40 AM.