Slight miss at 1/8th to 1/4 throttle. - Ford Powerstroke Diesel Forum
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post #1 of 27 Old 01-22-2014, 06:55 AM Thread Starter
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Slight miss at 1/8th to 1/4 throttle.

My truck has started getting this stumble or slight miss when i am cruising down the road at light throttle. It does not matter what gear it is in as long as im only at most at 1/4 throttle. When it does it its like the engine cuts out really quickly.I unplugged the ipc to see if it would help it did not.It will also intermitently run rough when i try to accelerate quickly its like the whole truck is shakey it also has a lopey idle sometimes. I also noticed when it goes back down to a idle it will have this weird fluctuation before it does. Could this be a ipr issue?


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post #2 of 27 Old 01-22-2014, 09:06 AM
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Sounds like possibly the pedal. Maybe it's tripping the idle switch when you're actually a little off idle. Or maybe a bad spot in the position sensor.

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post #3 of 27 Old 01-22-2014, 09:54 AM Thread Starter
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Is there a way to check it?


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post #4 of 27 Old 01-22-2014, 11:09 AM Thread Starter
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I checked it with a snap on solus and the volts to it slowly went up it never hit a bad spot and it maxed at 4.21 volts. I drove it and watched my number in a hard acceleration my ipr% was 36 and my icp pressure was at 2650. At a idle my ipr% was 12 and icp psi was 580.Then i ran a buzz test just because. They all passed but when i ran my cyl contribution test every cylinder failed!? This has got me scared any ideas?


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post #5 of 27 Old 01-22-2014, 03:26 PM
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Did you get actual codes (Pxxxx) with the CCT?
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post #6 of 27 Old 01-23-2014, 11:11 AM Thread Starter
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ran another cct test at lunch today heres what i came up with
-P0263-Cylinder 1 contribution/balance fault
-P0269-Cylinder 3 contribution/balance fault
These are the only cylinders that failed today. Yesterday it was all of them this makes no sense to me.


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post #7 of 27 Old 01-23-2014, 02:24 PM
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1 and 3 are on the same UVCH connector. I'd start looking there.

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post #8 of 27 Old 01-24-2014, 06:39 AM Thread Starter
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I already did all in good shape but i had a break through this morning i think. When i was shifting it bucked like crazy like it lost power and it threw alight that came on and off quickly. When i got to work i hooked it up to the scan tool and it threw a p0122 soft code.
P0122 Code - Throttle Position Sensor/Switch A Circuit Low Input.


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post #9 of 27 Old 01-24-2014, 09:05 AM
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A scan tool usually won't pick up a glitch in a TPS circuit unless it is really bad, you need to use a lab scope to accurately test the circuit. But if you are getting a P0122 it would be a good bet your TPS is bad.
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post #10 of 27 Old 01-24-2014, 09:55 AM Thread Starter
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I have picked one up from napa im gona throw it on and let you know what happens.


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