Hello,

I was recently driving my 1999 f350 powerstroke while accelerating around a curve I noticed a surge or hesitation followed by an ses light and loss of power. I turned the truck off and back on it ran fine for 20 miles then repeated the same issue.

The following codes were pulled

P0476
P1316
P0340

I checked the uvch and both were good, both are new as well.

I replaced the cps a week ago due to a similar issue but it threw no codes at the time. Could it be another bad cps? It continues to do this intermittently but I can feel a hesitation before it occurs.

Any help greatly appreciated

 

P0476 Exhaust Pressure control valve performance
P1316 IDM codes detected
P0340 CMP sensor circuit malfunction

The last 2 codes together usually point to a problem with the UVCH. P0476 can be set from building too much boost. There are IDM codes stored, you need a scan tool to retrieve them.

You didn't mentioned it so I'm going to assume there is no misfire with the hesitation. That could be the PCM cutting back on the fuel coming out of the injectors in an attempt to bring your boost back down.

 

I recently upgraded my injectors to stage 1's and added an sct tuner. Could this have anything to do with it? Could the new cps be bad and somehow cause the idm code?

I had the same issue a couple weeks back but no access to a scanner. Took a chance and replaced the cps worked normally for a few days and then started again. Seems to be happening more often as time goes on.

 

The injectors and tuner will cause P0476. The other codes might be stored codes. You will usually have a rough idle or misfire when you get the other two codes. There are a number of boost foolers out there. I use Dieselsite's BRV.

 

If you can reproduce the symptoms reliably by accelerating and turning a certain direction, you might want to pull your IDM and shake it. If you hear water sloshing around inside, that's probably the root of your problem.

 

Does SCT have tunes for single-shot injectors?

 

I will try to pull the Idm today and see if it is water logged.

I have an early 99 and originally had a ts chip on but they told me they couldn't flash the PCM for those injectors on an early 99. So I opted for the SCT, as they told me it would be fine. I have to get a custom tune made for the injectors. The shops near me that work with SCT won't touch a diesel unfortunately.

 

Just an update the issue has gotten worse can't drive the truck more than 40ft or so. Having a hard time getting to the idm.

With both uvch's being properly attached is it a good possibility that the idm had gone bad? Also that the new cps is faulty.

 

Is it possible that you may have a burnt pin in the 42 pin connector...

 

It's more possible there is a burnt pin on the VC gasket. Just checking the UVCH for being tight won't always achieve the goal under there. Click the UVCH link in my signature to find more help with testing the connections - without the need to pop the VCs.

What is the holdup with the IDM?

 

Here's write up cookie 88 and I did on a IDM mod it's step by step on the removal with pics maybe it will help with the IDM removal . It's in cookie's gallery 2001 Ford F250 4x4 - IDM mod pictorial

 

Thanks for all the help guys, have a new idm coming now it did have some corrosion on it. But took it to the dealer and they told me that the PCM is bad and that I have 3 bad injectors. But said nothing about the idm.

Could this be? I don't feel like that is accurate. I only lose power and misfire when the ses light comes on the truck has been resetting the ses light on its own otherwise I turn the truck on and off and the issue is gone. the truck has no misfire or power issues unless the ses light comes on.


(Update) I also installed an international cps and fixed the cps issue...

 

Thanks for that information, I will check those tomorrow. Very busy time of year for my work due to filling training obligations. I removed the idm it did seem a little corroded bit not to bad and no water in it. I got another for a good deal so waiting on it now.

Took the truck to the dealer to be looked at in the mean time and they told me what's listed above.

 

I had remotely similar symptoms (loss of power with SES/CEL lamp that would clear again when running normally again - P1316) that turned out to be a chafed wire rubbing against and shorting to valve cover under 42-pin connector. After all the things I've looked at, I think that'd be the first thing I'd check--very easy, and from there can easily check ohms on the injector circuits too (see Injector troubleshooting link in Tugly's sig). It would've been less work than the alternate route I took to get there.

 

Thank you I will try that next, could that falsely indicate the bad PCM and injectors as the Ford dealer has told me are bad?