Misfire- P1298??

[crapr6]

Hey guys my 1999 F350 dually just started acting up today. About 2-3 days ago i notice a slight rough idle and when you stood near the 5in canon you could kinda hear a loopy idle. Well today as i was driving i notice when the truck shifted into overdrive the truck would shutter (like a lock up issues)! I though great my converter is on its way out, well about 4-5miles down the road it started to shutter in every gear and notice when i stoped and let the truck idle it would run really rough like a misfire. When you stomped on the go pedal with the DP tuner you could really see a miss in the black smoke.LOL i know it sounds funny but the black smoke used to be continous when stomping on it but now it's like it smokes a bit then nothing, then smokes again,etc. I had issues like this with my 1994.5 PSD and it was a melted inj harness under the valve cover, so i pulled the valve covers on my truck and everything looked good. So anyway no check engine light but i check it out with my snap-on scan tool and came up with a P1298 IDM fault. So what do you guys think a bad IDM module? I dont have a break out box to check Ohm's,etc on the IDM module, but my buddy that his family owns a local ford dealer is going to check his stock to see if he has one in stock.
The DP chip dosn't set this P1298 code right? its another code it set's normaly right. So iam really thinking its the IDM module, what do you guys think?
Thanks

[forddieseltweek]

My buddy has a early 99 with the same exact problem..... We have tried 3 diff. IDM's and it still hasent fixed it......

[crapr6]

Originally Posted by forddieseltweek

My buddy has a early 99 with the same exact problem..... We have tried 3 diff. IDM's and it still hasent fixed it......

I was just told on another site that its a bad inj, iam going to wait till Monday to scan it at my buddys Ford dealership to see what i can come up with.
thanks
Erik

[mschn99]

it could be an injector, but more than likely you have one of your under valve cover harnesses that has partially disconnected itself. Get your valve covers off and check the harnesses....90% chance thats what it is....

[crapr6]

Originally Posted by Marc

it could be an injector, but more than likely you have one of your under valve cover harnesses that has partially disconnected itself. Get your valve covers off and check the harnesses....90% chance thats what it is....

I had the valve covers off allready and thoses 9pin connectors where nice and tight and i looked into the pins to see if they had any signs of melting,damage,etc which they didn't so i dont think that is my problem.
thanks for the reply.
Erik

[Visseroth]

any resolution on this? I'm getting the same error though only a very VERY mild miss.

[payne5757]

Bump for update.

[Visseroth]

FYI, most the time from what I have read on forums over the past year, a miss is usually caused due to a worn IPR, failing CPS or failing ICP.