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Old 12-03-2010, 01:28 PM
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Icp issues?

Ok, will try to describe this best I can. Truck has a weird idle sometimes, not all the time usually a few min after a cold start it starts to rise till it gets close to 1k rpm and will stay there for undetermined amount of time. Today in driveway I fired it up and idle slowly did it's thing and got up to 1krpm. I decided to pop hood and unplugged icp sensor, idle right away goes back to normal and truck seems to run and idle perfect. I let it sit and idle for about 5 min and then plugged the sensor back in. And what do ya know with in a min or so idle went back up and stayed there till I unplugged the sensor again. Is this a bad wiring issue because Icp sensor is brand new international part. Truck seems to drive just the same when icp is plugged in or not plugged in. Any one out there have any ideas
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Old 12-03-2010, 02:01 PM
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Did you have this issue before replacing the ICP sensor? Perhaps the new one is bad.

Check the connectors on both ends really carefully, perhaps there is something conductive shorting out when the sensor is plugged in. Could be liquid or metal.
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Old 12-03-2010, 02:04 PM
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How cold out is it where you are? When the temps drop the engines are programmed to go into high idle to help with warm ups. My truck will rise up to about 1100 after a few minutes of idling when its cold out. I bet thats what yours is doing too.
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Old 12-03-2010, 02:06 PM
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Quote:
Originally Posted by JSchuricht View Post
Did you have this issue before replacing the ICP sensor? Perhaps the new one is bad.

Check the connectors on both ends really carefully, perhaps there is something conductive shorting out when the sensor is plugged in. Could be liquid or metal.

yes issue was doing same with my other spare icp. I have looked at the ends pretty good and can't see any issues what so ever. I was thinking of checking the plug with a voltmeter but no luck yet on finding a post of what numbers I should be getting .
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Old 12-03-2010, 02:07 PM
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Quote:
Originally Posted by dieseldan2005 View Post
How cold out is it where you are? When the temps drop the engines are programmed to go into high idle to help with warm ups. My truck will rise up to about 1100 after a few minutes of idling when its cold out. I bet thats what yours is doing too.
It has done it when it was in the 70's out, florida
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Old 12-03-2010, 02:09 PM
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Next time UT does it touch the bbrake pedal, if it goes to normal idle its just normal function for cold start
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Old 12-03-2010, 02:21 PM
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Originally Posted by tekemp View Post
Next time UT does it touch the bbrake pedal, if it goes to normal idle its just normal function for cold start
Does not go away when you touch the break pedal. Like I said it will do it in warm temps. I started up a couple weeks ago after work. Got a mile down the road and stopped at a traffic light. Idle starts to go up and hangs there, till I get green light. Doesn't do it any more on the way home at stops.
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Old 12-03-2010, 02:27 PM
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Do you have a chip on it or have you scanned it for any codes? I think my throttle position sensor is bad in mine cause my truck will sometimes lurch forward at low speeds when barely on the throttle and my AE gave a tps code.
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Old 12-03-2010, 02:32 PM
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chip is pulled and no codes are being shown on my ae.
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Old 12-03-2010, 02:36 PM
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I should rephrase how i found my icp with the AE. It didn't show any codes but when i ran a system test it showed up on there. I can't think of what else would cause that to happen right now. It sounds like its just going into the high idle for cold weather but maybe there is something wrong in the pcm. I wonder if the coolant temp sensor is telling the engine its cold or something? That should throw a code though.
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