I have a 2002 f250 4x4 175,000 miles. Truck started running rough cold, but after a longer warm up would smoothe out. This got worse and worse. Then it just wouldn't hardly run. I thought it was the CPS, so I replaced that. It seemed to fix it for about 3 miles down the road. Then hardly run again. I made it home, and put scanner on it. 1316. OK I thought the UVCH. So I replace both harnesses, the VC gaskets, and the pigtails. Still no better with the same code. Then I start thinking something else is causing this So i clean the IPR and change out the ICP. I get the same 1316 code. It says #7 injector short to ground, #1,#3,#5,#7 non contributing. But when I ohm them out 1,3,5 are 2.7ohms, and 7 is 2.5ohms. The working side of the motor is all 2.7ohms. A buzz test sounds good, but you can tell a small difference in #7, but the entire bank is shutting down. I tested the harness all the way to the IDM, so after talking with a ford mech. I went ahead and replaced it. Still no fix. Then I started getting a 0605 code. internal rom error PCM. So I ordered one of those too. Just tried it. No difference. Also, I did notice that the tach went out again, and I believe that is a CPS thing, but it still does the same thing it did with other computer.I did replace the CPS again because the first replacement I got was still the black one, so now I have the grey one. But The wierdest thing is that when the scanner is attached and I get the truck to run at all, if I clear the codes in it, it runs perfect for about 5 or 6 seconds then it shuts off one side. It also does that when you first start it. Starts on 8 cylinders, then shuts off one side. What is next? I have checked fuel, oil, everything I can think of. Is there something that i am not seeing?
What am I missing?
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I did that i have 2 idm's, 3 ECM's, 2 cps's, it does it no matter what combination i put in it. it doesnt make any sence at all. I will get all the codes out tomorrow from ecm and idm and post them. I was going to take it to ford, but it wont run long enough to make it there..
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3,081 Posts
Well it has to be a shorted wire, might have bare wire under valve cover hitting rocker. If me, I would pull off that VC and run it at idle and see if rocker is hitting any wires. If it will not start then unplug all 4 injectors on that side and see if other side starts up. Yes it will be rough. Now if starts then plug 1 injector in at a time untill it shuts down that bank. If it shuts down that bank you found bad injector solenoid or wire feeding that injector
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25,189 Posts
Both you guys may have a short to the driver's side valve cover where the harness runs over it. Ford, in their wisdom, put the injector circuits on the bottom of the bundle. It could be fine when cold then hit the valve cover as it heats up. The fix may be as simple as some electrical tape.
sorry i didn't post it before.. after trying everything recommended, i broke down and took it to a dealer.. They found the problem but it took them 3 days.. The number seven injector was bad and some how shorting out the entire system. Truck runs great again. BUT I can say that since it has been fixed the fuel economy has been much worse. I used to get 24mpg on highway.. now i get 19 at best. I can't explain that one, but the dealer did say they had to reflash the pcm.. Who knows.. but at least its running
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34 Posts
Bet you have a single malfunctioning injector pop the covers and idle the motor to see if the injector are pumping fluid. The Whole bank on one side will shut down if one injector is messed up... been there don't that fixed and now at 400k +
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