HELP - New truck, rough idle and fails to accelerate sometimes - Ford Powerstroke Diesel Forum
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Old 12-23-2010, 05:52 PM
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HELP - New truck, rough idle and fails to accelerate sometimes

About two weeks ago, I bought my first diesel

It's an 06 F250 with 95,000 miles on it.

While test driving it, I notices that when idling after the engine was warmed up, the RPM would start surging between 500 - 1000 RPM. Other than that the truck was in great shape. I took the truck to a mechanic who told me the problem was due to the fact that the fuel filter needed to be changed.

Last week, I changed both the fuel filter and oil and the truck still would occasionally surge once the engine was warmed up.

Today when driving, I was idling at a stop light and the engine started surging again. However, once the light turned green, I pressed on the accelerator, and the truck continued to idle. I pressed the accelerator to the floor and nothing happened. The truck just idled through the intersection... NOT FUN. I turned off onto a side street, and the truck stalled out, and it took a lot of cranking before it would start again.

Being that I've never worked on diesels before, I have no clue where to start. searching for the problem. No codes come up.

What should I check? FCIM? Accelerator pedal?
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Old 12-23-2010, 07:08 PM
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Check the throttle position censor. If it's going bad it can make the truck surge but I'm not to sure about the no start issue.
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Old 12-24-2010, 08:18 AM
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sounds ficm'ish maybe... do you still have warranty? 06, you might... take her in if you do if you dont you need to find a shop with the good scanners and dodads they will tell you if its ficm or now my ficm went and it acted similar on mine i had no engine light or anything on the dash, just didnt wanna accelerate past like thirty mph.... idled up and down like yours, check swamps ficm i hear good things if your near ohio i know a good shop that can rebuild or replace them
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Old 12-26-2010, 07:38 PM
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Well, just got back from Christmas vacation. I'm not sure if the truck has any warranty left. In the morning I will take it the the dealership and see.

If it is a sensor or something, I could check and replace it on my own and save the $100 deductible. Although I'm sure the FCIM is beyond my ability to diagnose.

I have read that the ICP sensor can cause rough idling. Could this sensor also cause the truck to go into a "failsafe" mode and prevent the truck from accelerating? I doubt it, but I just wanted to check.
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Old 12-26-2010, 08:12 PM
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FICM is easy to test with the right tools. It took me about 20 mins, check the threads in my sig for test procedure under "no start" thread
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Old 12-27-2010, 07:25 AM
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Thanks Chango, I will check that.

As I drove the truck last night, I finally got two CEL codes. P0299 (Turbo underbosst) and P2285 (ICP circuit low)

I have found some information on testing the ICP sensor reading the pressure from a scan tool. Does anyone know what voltages it should be so that I can use my multimeter (I don't have the $2,000 scan tool)

I just got back from the dealership, and the warranty expired on 12/22/2010. So I just missed it. So fixing the problem is on my own dollar now.
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Old 12-27-2010, 07:41 AM
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sounds like an ICP issue. or trash in the screen of the ICP. But its hard to diagnose without having a scan tool. Maybe someone one here around you can help. Where you located.
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Old 12-27-2010, 08:03 AM
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Sounds like it is begining a hpop leak...
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Old 12-27-2010, 03:54 PM
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Quote:
Originally Posted by MINIs1094 View Post
sounds like an ICP issue. or trash in the screen of the ICP. But its hard to diagnose without having a scan tool. Maybe someone one here around you can help. Where you located.
I think it might have been an issue with the ICP or the plug. After I got the CEL code, I unplugged the ICP then plugged it back in and cleared the code. After 3 hours of driving, I have yet to have the engine act up.

I hope it was just a bad connection, but I figure the problem will come back in a day or two.
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