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Discussion Starter #1
I have a 99 F250 and my problem started when all of a sudden at a stop light it started running really rough and the Service Engine Soon light came on for about 5 seconds and the problem went away. About 20 minutes later it happened again while driving and lasted for about 10 or so seconds. When I got home, I pulled DTC code P1316 using my SuperChips programmer. I drove the truck a couple of more times and it kept happening more often until finally it just runs like crap all the time, barely idles and the service engine light stays on, and the DTC code P1316 still now showing up. My initial thought was my IDM was bad so I ordered a reman unit from a company in Florida. I installed it, cleared my DTC codes, the truck started right up and idled smoothly. I drove the truck for about a 1/2 mile, got down on the throttle about 3/4 of the way and bamm like turning off a switch the truck started running like crap again and service engine light is coming on. Pulled the DTC code P1316 again. After reading a few post, I know now to look at the UVC gasket and wire harness. I don't have a scanner so can't do a buzz test so I unplugged driver side UVC harness attempted to start it and it would not, plugged the driver side back in and unplugged the pass side and it started. So, assuming the pass side UVC gasket and/or harness is bad, I bought a new set from ford and installed it. No luck. Same problem. I then used the old pass side gasket and harness and installed it on the driver side assuming maybe the driver side is bad. No luck. Same problem. Any suggestions are greatly appreciated. :doh:
 

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HEARING IMPAIRED
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Fuel issue? What is the P1316 code. Where have you been getting fuel. How much fuel is in the tank?

I had the same issues a while back when someone stuffed a cigar in my fuel tank.
Sending unit was picking it up and was causing the truck to run really rough. I had to pull the bed up, get the sending unit out and clean it really good.
 

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Need to get a volt/ohm meter and tone out the engine harness and the wiring to the IDM. There is a wiring diagram in the tech section. Also, double check the pins and harness connectors for damage. Make sure the main harness connection is secure.
 

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kinda hot in these rhinos
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i had the same exact problem a month ago... marty got me some clips from international because the uvc harness separates... fixed the problem... pm me if u need more info
 

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I have the same issue, only without the rough running condition. When it runs bad, does it sound like there is a dead miss?
 

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Discussion Starter #7
I'll try the volt/ohm test using the wiring diagram. Unfortunately I don't have a scan tool that does a buzz test so I won't be able to perform that right now. Might have to break down and buy one since I could use it anyway. If you know of a good hopefully not too expensive scan tool, let me know.

Thx,

Greg
 

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Are you sure the clips are in all the way? If you're losing a whole bank, then its got to be a connection issue, either under the VC or right before it. One of those two main connections.
 

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kinda hot in these rhinos
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Are you sure the clips are in all the way? If you're losing a whole bank, then its got to be a connection issue, either under the VC or right before it. One of those two main connections.
i had the same exact problem a month ago... marty got me some clips from international because the uvc harness separates... fixed the problem... pm me if u need more info
:poke:

You have a PM, gpbourg
 

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Discussion Starter #13
Positive the clips are on all the way. I even ran an ohm test from the pass through pins on all the injectors on both banks. All injectors measure 3.1 ohms.
 

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Discussion Starter #14
I unhooked the uvc connectors and measured the center pin on each side. I got 1.332v on the pass side and 4.54v on the driver's side. Does this mean anything?
 

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:whs:
i had the same problem with my early 99 i replaced IDM and my valve cover gasket harness was bad check all wire leading to valve cover
my da had the same thing happen to his truck! I put a used IDM in a worked!
are you shore you got a good IDM
 

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I'll tell you if a new IDM fixes my P1316. Should know by next week hopefully.
 

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Discussion Starter #18
Found the IDM relay in the power distribution box and switched it with the blower motor relay. No luck, same problem. I found a wiring diagram on powerstrokenation.com forum and used it to toned out the four injector wires from the valve cover harness back to the 42 pin junction box and then from the juntion box to the IDM. I went ahead and checked both sides just in case. I performed the "wiggle" test on each one and all have continuity all the way back to the IDM with no change in ohm reading. I also didn't notice any wires that were rubbed through their coating or were freyed or burnt.

Using my scan tool, I performed the Continous Memory Test. Along with the same P1316 I'm also getting a P0603 - Power Train Control Module Keep Alive Memory KAM error. Does this indicated any other issue?

For my next test I tried running the KOER test with my new scan tool to see if it found anything. So, I started the truck, and of course it's running very rough and the Service Engine Light is on. My scan tool failed to run the KOER test because it kept telling me it had a communication error and couldn't continue. I began reading the scan tool manual thinking maybe I missed something or maybe its not compatible with my truck. Then all of a sudden my truck starts idling smooth and the Service Engine Soon light goes off. Remind you, the truck is sitting still just idling. Go figure? With the truck idling smooth, I thought it was a great opportunity to do a complete "wiggle" test on all the injector wires to see if I could get it to run bad and the Engine light come on again. Well, I wiggled, and wiggled and wiggled all the injector wires from the UVC harness back to the IDM. Nothing! Truck is still idling great.

Since it running normal now, I proceed to drive the truck for ~ 3 miles. Drove slow for a while and then got down on it a couple of times. No problems. Truck is running normal. Smooth idle and good power.

I then proceed to go ahead and clear the codes and run the continuous memory test again and I'm still getting the P0603 code but not the P1316.
I re-ran the KOEO test and no DTC codes are being detected now.

What does the P0603 by itself really mean?
 

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The P0603 code more or less means the power source to the computer has recently been disconnected. I've been told it should reset itself after a certain number of engine starts (50?)
 

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Discussion Starter #20
Well, I'm back to square 1. I attempted to drive the truck yesterday and didn't even make it down the driveway when, like turning turning on a light switch, the service engine light came on and it's running like crap again. Not sure where to go from here since this problem is so intermitant. I guess I could bring it to the dealer. But, we all know how much that cost. :doh:
 
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