Compression Ignition Addict
Join Date: Nov 2007
Location: Cornwall, PA
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Problem w/ truck after tuner install
Just got a 2002 F-250 a couple weeks ago (new to diesels), and after cruising around these forums for a few weeks, I just had to go out and get a tuner. So I ordered an F5 DP tuner with a 60/tow, 80/econo, and 120/Race tune.
I went to install the tuner last night, and when I pulled the cover off the IDM i could clearly see the truck was chipped before. No biggy, I kinda expected this, but what I wasn't expecting was whoever cleaned the terminals before had sanded them down pretty far and had scratched the board fairly deep closest to the terminals.
I cleaned and inspected the terminals (everything looked like it should work), installed the tuner, and went out. I could instantly notice the power, though it seemed doggish until I hit 1800 rpm on the 80 econo tune (like I couldn't get up a hill in 4th gear like I could in stock). After a little it started to run great and I drove it around for awhile messing with the tunes. Took is out this morning to go to work, and it ran good except it would seem to "miss" every once in awhile. Left work and took it on the highway (still seemed to occasionally miss). I hit the 120 Race tune for a little (I just had too) then I noticed the check engine light. After this is started to run like poop. It would "buck and miss" and just felt like fuel was being cut in and out, I had a hard time getting the truck to move sometimes. I would press on the pedal and it would do nothing, then it would just take off. Went back to my garage, pulled the chip back out, cleaned the terminals again, and went to pull out of my garage. The truck did not idle right, so I goosed it a little, it missed and then died. I tried to start it but it would not fire. I pulled the chip back out and reinstalled the IDM. Still wouldn't start. Turns over but doesnt sound like ANY fuel is being injected.
I'm thinking my IDM is toast (and hopefully not my tuner). From what I can tell, these computer units are what drive the injectors on our trucks, hence why it is called an IDM instead of an ECU.
What else could I check? I'm really new to this truck and could use any help I could get. I'm fairly mechanically inclined, been working on my cars and race mustang for years, but I'm kinda sick to my stomach thinking about how to fix this truck I really know nothing about.
Sorry for the long post!