runnin on 4

[alabamafrog]

603 is nothing, it just sets that one when computer power is cycled which can be caused by disconnecting batteries or changing tunes with a programmer. It’s nothing to worry about (Keep Alive Memory) just lets the Ford folks know if you’ve been messing with the computer so they can void the warranty.

470 is a problem with the EBP (exhaust back pressure) sensor. It is located above the water pump and has a tube that runs to the passenger manifold, it works with the EBPV (exhaust back pressure valve) which is a butterfly valve in the turbo exhaust outlet and is operated by engine oil piston actuator in the turbo pedestal. This whole conglomeration of parts is supposed to aid in warm up time in really cold weather. Sometimes it could be the sensor but a lot of times the tube is either clogged or rotted out. I have removed all of that crap from my truck.
Neither of these codes will cause the truck to not run or miss.

[hc speed]

a local guy told me to replace the computer , says it happens all the time , but from reading the pages here it dos'nt seem any one else has had this exact problem , also i'm very interested in removing as much unnessacary clutter from under the hood as possible

[alabamafrog]

I’ve been working on these things and watching powerstoke forums for many years now and I can’t remember anyone saying they had a bad miss and replacing the computer fixed it. I’m not sure about the local guy’s statement of “happens all the time”.

[alabamafrog]

So help me clarify your current problem,
Originally it had one dead bank and you found a melted plug. You’ve fixed the melted connector and are absolutely sure there are no wiring or connection issues under the valve cover or in the valve cover gasket plug or in the engine harness plugs? You had it code read and found two seemingly unrelated codes? The truck now runs but has a slight miss? Have you cleared the codes and seen if any beside 603 come back? Do you have access to a spare IDM you could try? How much have you tried to run the truck and how bad does the miss seem.

[hc speed]

Originally Posted by alabamafrog

So help me clarify your current problem,
Originally it had one dead bank and you found a melted plug. You’ve fixed the melted connector and are absolutely sure there are no wiring or connection issues under the valve cover or in the valve cover gasket plug or in the engine harness plugs? You had it code read and found two seemingly unrelated codes? The truck now runs but has a slight miss? Have you cleared the codes and seen if any beside 603 come back? Do you have access to a spare IDM you could try? How much have you tried to run the truck and how bad does the miss seem.

this is no slight miss this truck is only running on the drivers bank , it dose'nt have the power to get up the drive way . I have swapped parts from drivers bank to pass ( vc gaskets , harness,e ) and the driver side always runs and the pass never . for the first couple seconds it runs and ssound great but imediatly the engine light comes on and it drops the right bank ,and the engine srarts laboring violently . I unplugged all the 4 engine harness plugs and with the switch on I checked all the terminals with a multi meter and all have 12 v on the outside terminals so i assume what ever is going on is happening after startup ,I have only driven this truck three times in the last year , but the last time i tried i touched the break pedal at the stop sign near my shop and boom she lost power and i barely made it back that was three months ago and i just got around to working on it last week , I posted a pic of the wireing harness i found toasted under the vc but its been replaced ,I still have the scanner in the floor board and i cleared the codes but they came back the sme 2

[alabamafrog]

Okay, always the same side and it doesn't run on that side at all. Swapped parts from one side to the other and the problems stays on the same side. Seems to me like the common link is the IDM. If I had a spare one I'd send it to you to try but that is one spare part I aint got yet.

[hc speed]

can u tell me what it looks like and where it is ? can it be tested (ohmed etc)? thanks

[alabamafrog]

It looks like a box, kinda like the PCM, on my E99 it is inside the drivers fender well and I'd have to pull down the rubber fender skirt to get to it. Your 96 I think is in a different place, I hate to try and give any advice on something I'm not familiar with. Maybe search some posts on IDM's. Also I don't think there is a way to test it and since it makes something like 110 volts of DC power you better be careful with it or it might knock the crap out of you. Again I have no way of knowing that your IDM is bad, thats just a guess and probably what I'd try next. It would be better if you could borrow someone’s that is known good. If you do decide to buy one then I recommend car-parts.com for used electronic parts, I got my spare PCM from them for $75 delivered. It looks like if it were an IDM problem then you’d be getting IDM codes for it but stranger things have happened.

[alabamafrog]

Here is some info I found on the net about them;

Powerstroke Diesel IDM mod

IDM Mod

[hc speed]

well i just did the engine run test with the scanner and got an 0476 code exh pressure valve , and actually it sounded better for a few seconds while the scanner was doin its thing , could that do it and if so i gotta pull the turbo to repair it right