Surging/Wierd Idle PLEASE HELP!! - Ford Powerstroke Diesel Forum
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Old 12-05-2010, 11:56 AM
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Surging/Wierd Idle PLEASE HELP!!

Hey Guys,

I recently developed surging idle after the engine warms up.... here is whats happening, after i drive it on the highway, and i come to a stop at the stop light i could feel the idle surging.... it goes up and down, you can feel the vibration inside, not really like a miss, but more of a whole truck vibrating, and it sounds really weird through exhaust (i have turbo back MBRP with no kitty so you can really hear the stuff)... also when at stop light and turbo vanes are circulating, and the exaust tone goes from whistle to rumble so to speak, idle starts acting up as well, like the vanes get stuck, or they are trying to change position from open to closed, but they dont it sucessfully.... Also, before when i turn A/C on or off, engine would never feel it, but now when I turn A/C I can really feel it, and surging idle crap/vibration starts happening again... In the past 9 months i have put 8 brand new injectors, HPOP, HFCM, FICM...

Any help is always APPRECIATED!!!!!!!!!
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Old 12-05-2010, 12:12 PM
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I have the same problem and have had for quite some time. I also have mbrp and the truck also changes when you turn ac on i took the truck in to the dealer they cleaned the turbo changed egr but same symptoms if ou figure anything out let me know
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Old 12-05-2010, 12:21 PM
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Unhappy

i have a 97 7.3 it has no power.i just bought it. dirt cheap .when i try to drive it it has no acceleration and sounds like a miss.
the check engine light does not come on at all.i plugged in my code reader to be sure and there are no active codes.
this is what i have done.
1) fuel filter
2)oil and filter change
3)air filter

i am thinking a fuel pressure test is next but i am not sure where to check it.i am new to diesels and can only assume that there is a shrader port somewhere.
also i do not know what the pressure should be.
any suggestions on where to go with this problem would be great.
thanks
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Old 12-05-2010, 02:38 PM
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For surging you could have them check the fuel pressure on the rails. Might be bad plugs at the ends of the rails leaking fuel. Also it could be one of the idle valves having issues I was having surging and had to have one replaced but I cannot remember which one it was exactly. hope this helps some
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Old 12-05-2010, 03:02 PM
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It sounds like an ICP Sensor, I just changed mine today for the same problems. Do you have the ability to read codes? If so, what codes are you getting. I don't think it is the plugs on the fuel rails, as the OP's truck is an 03. Those plugs don't come into play unti the late 04 build engines, I think. If you don't have the ability to read codes, find someone who can help you out with this. I waited until I threw a code before I changed anything, I didn't want to throw money at a problem without knowing what it was.
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Old 12-05-2010, 03:08 PM
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Quote:
Originally Posted by Heathrm View Post
It sounds like an ICP Sensor, I just changed mine today for the same problems. Do you have the ability to read codes? If so, what codes are you getting. I don't think it is the plugs on the fuel rails, as the OP's truck is an 03. Those plugs don't come into play unti the late 04 build engines, I think. If you don't have the ability to read codes, find someone who can help you out with this. I waited until I threw a code before I changed anything, I didn't want to throw money at a problem without knowing what it was.
I agree with you. Its the ICP sensor.
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Old 12-05-2010, 03:50 PM
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I tried to pull the codes but there were none... no check engine light, no codes...i will try new ICP, and hopefully that takes care of it.

I really appreciate it guys!
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Old 12-05-2010, 04:16 PM
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i agree with the ICP sensor. i had the same problem for like 6 months and i never threw a code. finally about 3 weeks ago it threw a code for icp sensor so i replaced it and it finally went away. so im down with the icp sensor
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