Icp duty cycle
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Tuned
Joined: Feb 2015
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Icp duty cycle
I have a 2000 7.3 zf6. Truck has been bucking in the lower gears and has a very slight miss while cruising. Icp duty cycle is reading .18 on startup and goes lower than that while warming up. Icp psi reads 730 on startup and goes down from there while warming up at idle. Is the icp possibly bad?
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From: Henderson, NV
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Tuned
Joined: Feb 2015
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It's actually IPR duty cycle controlling ICP. IPR DC and ICP at steady-state idle should hover between 9-12% and 480-600psi. Like @Wes444 said, check that the tin nut on the back of the IPR is tight. What is your fuel pressure doing while the truck is bucking?
Mountain Pass
Joined: Mar 2017
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From: Baltimore
Just did my ICP on my '01 with 273k on it. I wasn't having any driveability issues but noticed oil in the plug. Looked to be original. Pull the plug as mentioned to see if symptoms are better but if there is oil in it its time to change it.
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Tuned
Joined: Feb 2015
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will do. It can get quote confusing trying to see how all these sensors work together
Mountain Pass
Joined: Mar 2017
Posts: 131
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From: Baltimore
Agreed. When I was researching mine I stumbled across this video that does a great job explaining how everything works. This really helped a guy like me who is semi new to the 7.3, hope it helps:
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FTE Chapter Leader
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From: Henderson, NV
i have an sct tuner with gauges but i dont think it monitors fuel pressure...i also changed fuel filter a few months ago..i also notice truck runs better once i fill the tank up...just seems weird that it bucks as if fuel is getting cut off intermittently...i will have to try and check those sensors out...
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Tuned
Joined: Feb 2015
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Fuel pressure is one parameter that is not monitored by OBD on our trucks unfortunately. You will have to either install an aftermarket fuel pressure gauge or do @SkySkiJason 's quick fuel pressure gauge that connects to the fuel bowl drain. The fact that it runs better after a fill-up leads me to believe your fuel pickup mushroom might have failed. Do the problems occur when the tank is getting down to 1/4? Have you performed the Hutch and Harpoon mods?
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Joined: Jan 2005
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From: Henderson, NV
Replace the ICP sensor and pigtail with Motorcraft originals then.
Laughing Gas
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From: West Coast/L.A. Area
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