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Old 03-10-2013, 04:47 PM
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Rough loping idle, low power, stumbling

Went out to start truck today after work and she's idling horribly (bouncing between 500 and 800 rpm). It'll drive but it shakes like a bastard and is down on power at stops it'll almost but not quite die. I've been reading about similar problems but it seems like this could be anything. Truck mods are in the sig. Thanks in advance fellas. Also, I have a video of the problem... Anyone know how to post it?
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Old 03-10-2013, 08:13 PM
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Little update, fuel pressure was rock steady at 65 on the aeromotive gauge, during rpm fluctuation as well. Truck ran worse and worse and had to have it towed. tried to start it after towing, ran for ten seconds and died, no start now. leaning toward ICP, but I don't want to start throwing parts at it. Will I damage anything by unplugging the ICP sensor and trying to start it? I wouldn't think so, but the last thing I need now is serious damage.
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Old 03-12-2013, 09:06 AM
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Nothing? I unplugged the icp, cranks no start. Now fuel pressure is at 45psi. Icp sensor end looked oil and I hear that's not good. Any ideas anyone?
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Old 03-12-2013, 03:03 PM
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i would change the icp sensor an maybe the plug
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Old 03-12-2013, 03:27 PM
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You can throw parts until you monitor live data to see what it is and scan for codes.
Could be UVCH, IDM, PCM connection. Random things maybe even. I'd think ICP, IPR, or UVCH.
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Old 03-12-2013, 05:26 PM
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dont mean to hi jack up post but does anybody no how to wire up the male side of the vcg plug
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Old 03-21-2013, 06:41 PM
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Update...unplugged icp and it turned out to be covered in oil. So I replaced it and it ran okay with the CEL on. Drove it for maybe 35 miles and it started stumbling and dying again, no lope this time. Took it to the shop so they can check the duty cycle and hpop pressure. Bought a spare ipr just in case... Need to get auto enginuity
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Old 05-04-2013, 05:05 PM
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I know this is kind of old but did you get it going? if not try your cam sensor its really easy to do and mine did the same thing and that was it they are prone to fail.
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Old 05-06-2013, 03:52 PM
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That was the first thing I tried. No luck. It's in the shop now, guess there was a little ghetto wiring going on and a cascade of **** after the icp went out. But looks like there might be light at the end of the tunnel...
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