Ok, I've gone through some previous posts concerning the P1298 code (IDM Failure), a few seemed to have ties to the mod, but no conclusion. Truck runs fine, starting is a little hit or miss, but once running, all is good.

Diagnostics:
AE v.8.1 w/Cale's Chip, Engine oil temp over 150*, ~55* outside.
Buzz test1: All buzz, 8 individual buzz, result P1298

-Cleared DTC's (all my normal ones), did not restart engine
Buzz test2: All buzz, 8 buzz, result P1668 (PCM/IDM Communications Error)

-Reset KAM, no engine restart
Buzz test3: All buzz, 8 buzz, result P1298

-Removed chip, no restart
Buzz test4: All buzz, 8 buzz, result P1298

-No chip, started and idled engine
Buzz test5: All buzz, 8 buzz, result P1298

-No chip, reset KAM, no restart
Buzz test6: All buzz, 8 buzz, result P1298


Replaced cihp, started and drove on. No problems, started right up, idles a little rough. So does the 75k Mod on my 110v IDM cause the AE to believe there is a problem with it? I just don't want to find out I have a problem lying in wait!

 

I did a quick search and saw Visseroth had the same problem. Maybe shoot him a private message. What's up with cold start and rough idle? Good luck and a bump for you.

 

Thanks Grant, I read that thread, and went ahead and PM'd him. My truck has always liked to be started like a gasser. Remember, most of its life was in Georgia (read NOT cold) so I'd just get in and turn the key to start. If I tried the WTS thing, it NEVER started on the first attempt. Wish I could tell you why. So, now that I'm in Missouri and it is COLD, I've been doin the WTS thing, hit or miss it's been working.

FF to today I'm leaving the Barber and of course there has to be people in the parking lot, go to start the truck, and it cranks and cranks... no start, no smoke . So I stop, turn off, reattempt... same... turn off, reattempt... then it starts without incident. I'm befuddeled. Mind you, my AIC was reading ~160-180rpm during the cranking so it was spinning like a top, full tank of fuel, not even 1/8 quart low on oil, was completely up to operating temp... that is what prompted me to hook up the AE, and subsequently found the error after doing the initial buzz test. Weird.

 

Have you checked fuel pressure? Odd that it has never started on first attempt. Maybe injectors? I assume you have gone through all the basics (glow plugs, relay, icp duty cycle, icp pressure, batteries, etc...).

 

When you say 75k mod, you're talking about the IDM mod where you bump it up to 140, right? You're not going old school on us and soldering a resistor at the ICP are you?

Did Visseroth have an e99 also? I wonder if the jump from 110 - 140 is what did it. Didn't Robin do the IDM mod on his?

Just kind of mumbling here, but if the truck is running fine, I don't think you've got an IDM failure. It's like the P0605 PCM failure we sometimes see with a chip when everything is fine. I'd guess modding the IDM does have some effect on the self test. I'd ignore the issue unless someone comes up with a reason not to, or has experience with this situation.

 

Well I was not worrying to much about it, but since on two separate attempts to start today, it reacted in a "new" way, leads me to believe something has changed. If that something is eminent failure, I want to be proactive.

 

Ok, Visseroth PM'd me back and confirmed he still has the P1298, AND the truck still runs fine. Looking like modding the 110v to 140v might get its panties in a wad during a self test. Any other ideas?

 

Well this is a bit ironic that I was searching using google today to try and find information on the codes P1298 and P0605 because I scanned my truck today to see if there were any new codes or anything to be concerned about before I head off to my fishing trip this weekend and I stumble on this post

So I do believe that these are normal codes now for a couple reasons.

One, I have a SuperChip that came with the truck when I bought it.

Two, I have done the IDM mod.

The other reason I was scanning my truck is because I have a very mild miss every now and then. Nothing to be extremely concerned about, it doesn't do it all the time and as I said my truck runs fine but I suspect the problem to be my IPR on it's way out but I don't have the money to buy a new IPR atm, maybe later this month.

So anything new on your end? Clear the codes up yet or not worrying about them?

Edit: Also getting P0284 even after the FRx upgrade on a black CPS.

 

when i had trouble with my injectors ryane said the P1298 is common on a moded IDM..dont sweat it...

 

I used to get the P1298 code with my modded IDM also. Even got it with the reman I put back in when going back to the 120v. I have no starting issues and after several buzz tests, it seems to random. I haven't hooked the AE up in a while. I will check it again soon and see it the code is still lurking in there. I am not worried about it if it still exists. All is good.

 

Do you guys know if Jody's DP can change the IDM voltage from stock to 140v?

 

if he could we wouldnt need the resistor...he can tune around it..

 

No... Its not a tune issue with the IDM... Its a Physical limit of the unit...

He does not tune around it, the IDM is what it is, there is nothing in the programing that can do anything with the IDM. It recieves a signal from the PCM, and fires 140, 120v down the line...


I do prefer Swamps modded IDM, its more of a tune up on the IDM, then a hack.

 

he adds less fuel....ask him.....i did.....

 

ahh, ok, makes sense. Well as soon as I'm able I'm going to order one of swamps IDMs and swap it out and keep my old IDM as a spare. I plan on ridding my truck of ALL trouble codes as time and finances allow. I plan on having this truck running, riding and looking like a new truck, minus the obvious dirt under the body.

Thanks guys.