Stock 97 F-350 4x4
Back in December during a particularly cold Texas morning I went out, plugged the truck in like I usually do about 2 hours before I have to go anywhere in cold weather. Left the house about an hour and a half after that and she was running fine for still being a little cold. Got all the way down to my road and noticed once I came to a stop a rougher/lower idle like a fuel issue. Sat with the idle up a bit before noticing no improvements so I turned around and went back home and shut it down. It would start and run exactly as the one in this video
with bad UVCH plugs. Once you started it it would lope and you had to give it a little fuel to raise the RPMs until eventually you could let it idle without loping but still sounded like it was running on 4 cylinders/definite miss. All fuses looked intact. Checked the fuel filter and it looked great but we did notice some gunk in the bottom of the bowl. My father brought his scantool home and returned a P0470 EBP code (have always had this) and a P0603 Internal Control Module KAM error but no 1316 to indicate UVCH issues. Pulled both valve covers off anyway and noticed both harnesses were plugged in fully along with all the injectors. Because of the KAM error, ordered a reman IDM from a reputable place in FL and installed it with no change in behavior. My father thought possibly it was the HPOP so we got down to it but noticed no oil around it in the valley. In the process of pulling the fuel bowl we did notice and replace some gummy fuel lines and replaced them as well as cleaned the bowl before reinstalling. The truck sat for a couple weeks due to no time/no money until one day we had an emergency arise and had to use it. Long story short I limped it where we needed to go (I did notice it ran a bit better once engine temps rose but still a somewhat noticeable miss). On the way back however, I was coming up to a stoplight, the trans suddenly downshifted hard and once I got to the light I noticed it had even less power than before, like it was now running on 2 cylinders. Luckily I managed to keep the RPMs up and get through the light before it shut down completely. It wasn't as if someone cut the key off like when the CPS cuts out but rather a gradual decrease in RPMs with no response to throttle until it died. Coasted to the shoulder and tried to restart. The injectors clicked during cranking and it acted like it was trying to fire but wouldn't. Got a pull back to the house and truck sat for another week due to an unexpected out of state trip. When we got back we tried throwing another CPS on it for the sake of argument but to no avail. Hooked it to the computer again and here's the list of DTCs it gave. Quite a bit more than before:
P0603 - ICM KAM error
P0236 - Turbo Boost Sensor A Circuit Performance
P0340 - Cam Position Sensor Circuit Malfunction
P0470 - EBP Circuit Malfunction (normal)
P1280 - Integrated Control Panel Circuit Performance (ICP was out during the test)
Ran an injector buzz test then got the following codes:
P1293 - High Side Open Bank 1 (Right)
P1294 - High Side Open Bank 2 (Left)
After doing this we put the first cam sensor back on since the new one threw the 0340. It's the others that are troubling.
Other things of note:
- ~1500 miles on new oil/filter
- Now when cranking it doesn't try to fire
- Oil pressure was right in the middle of the R/M on the gauge before it quit
- Noticed no oil pressure on dummy gauge while cranking. Took the oil sending unit off and hooked a manual gauge to it. Noticed no oil pressure either.
- No oil in ICP when disconnected (good thing)
- WTS light illuminates and goes out as normal
- Tach registers when cranking
Right now the only thing we can think of is that the LPOP failed due to the lack of oil pressure. Any help or steering in another direction would be greatly appreciated.