3/4-full throttle misfire/cut out - Ford Powerstroke Diesel Forum
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Old 03-28-2013, 06:01 PM
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3/4-full throttle misfire/cut out

Hi everyone.. Great site I'm new to it.. I'm restoring a 92 f350 which has a 97 powerstroke motor swap with a 5 speed man.. I replaced all glow plugs , harnesses, fuel filter.. Cam pos sensor(ford)..starts mint.. Idles perfect and runs mint until your over 1/2-3/4 throttle or full throttle starts missing above 2300 rpm.. Cuts out, I don't know what my next option is.. The previous owner said he drove it for 2 years like that.. I'm not sure if the truck has a check engine light cause I've never seen it light up.. The only code it did show before I changed it was the cam position sensor.. Which helped the truck run smoother.. Help?
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Old 03-29-2013, 08:14 AM
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Sounds like a bad ICP, IPR, or weak HPOP. The easy way to find out is to have a shop run a diagnostic but I can show you how to do it with a DVOM and some math...


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Old 03-29-2013, 08:58 AM
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Ok I'm pretty decent with tools.... I'm ready to try. Thanks!
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Old 03-29-2013, 08:58 AM
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What's a DVOM?
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Old 03-29-2013, 09:21 AM
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Digital volt ohm meter. Analog is preferred though. I'm in a meeting for at least the next hour but ill get back to you.
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Old 03-29-2013, 09:47 AM
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Lol, duh. Thanks.. No problem talk later.
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Old 03-29-2013, 10:46 AM
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im watching and waiting,got pen in hand,and analog meter sitting idle,thanks
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Old 03-29-2013, 11:48 AM
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Here is the info:

Start by locating a bunch of staples. Bend one leg straight out ->





[I don't have the proper connectors for the truck on my desk but this works the same]

Go to the connector you are looking to monitor and insert the staple between the wire's insulation and the weather shielding. When done correctly you can collect live information and not mess up any wiring or shielding while the truck is running. Do this for each wire in the connector. Don't let the bent ends of the staples touch each other or it will freak out the PCM. You will know when the staple is far enough into the shielding when you get a very low Ohm reading (like .1 Ohm) by touching the staple end and the corresponding pin inside the connector. The reason for using an analog meter instead of a digital one is that analog meters respond near instantly where digital's all have a set refresh rate that is not controlled by you and you can miss readings if the meter doesn't refresh quick enough. Reconnect the connector to the sending unit ->









Here is the information that you are looking for form each connector (copy paste the images into Word or the like and print them out):

ICP:




IPR


Last edited by BigFuel; 03-29-2013 at 11:53 AM.
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Old 03-29-2013, 12:00 PM
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Wow that's impressive, I will try that when my stomach does not feel like its going to fall out
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Old 03-29-2013, 02:36 PM
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So it appears that I'm checking the harness for issues? Or do I leave the sensor plugged in to the harness when checking.. Thank you very much!
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