Ok, i need some ideas here.
First up, truck specs:
96 F250. Auto, 141k miles. Reman PCM
from cardone ~2 months old, TDE7 calibration. Baby Swamps, Swamps IDM
, Swamps tunes (chip currently removed). The usual intake/exhaust combo. Lots of new parts in the last 8 months (MAP
, fuel pump, fuel heater, glow plugs, GPR, UVC
harnesses, VC gaskets, VSS
). FPR & IPR
were serviced in September.
The truck had big issues which led to me checking alot of stuff back in september, ended up finding corrosion in the PCM
, which is why it got replaced. That immediately fixed the truck, however it ran like crap when cold (would act like a failing CPS
). Once it warmed up, the truck ran fine. However, as of this past saturday, the truck runs like hell all the time. it acts like a bad CPS
, and it finally threw P0340 on saturday, and again yesterday when i stopped by the local garage so we could pull codes on the truck (i do not have a scanner). It died in their parking lot. No tach movement, and CPS
DTCs. Cleared em and put my new spare motorcraft CPS
in, and nothing. Threw P0340 again and wouldnt start. Swapped both back & forth but got nothing. Got a ride home, and went to the dealer to get a brand new Motorcraft CPS
. Swapped this one in (#3) and nothing. Threw P0340 again. Went home as i was soaked from working in the rain.
This morning i went back, and it still wouldnt start. Unplugged the PCM
, ohmed the wires for the CPS
, everything in the wiring seemd fine. I have 5v where im supposed to, the ground is good, and i get 12v down the signal wire from the PCM
, when the key is on.
Put it all back together with my old CPS
(#1) and it started up, but only ran for about a minute before stalling out. Threw P0340 yet again. i never got it started again. Had it towed home, and took the wiring harness apart. I inspected & ohmed the wires from the CPS
to the square connecter on the fenderwell, they all look good. I ohmed the 3 from the square conencter to the PCM
connecter and again everything looks fine. So whats wrong with this thing?! Is my Cardone PCM
no good? Is my camshaft bad and none of my CPSs can target it? At this point i dont know what to do, short of replacing wires 'just because', even though i cant find anything wrong with them.
Short version: Truck didnt run, replaced PCM
. Truck ran like crap when cold, then like crap all the time, now it wont start. Constant CPS
codes with multiple different CPSs. All wires ohm good.