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Unplugged ICP

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Old Dec 8, 2009 | 11:59 AM
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Unplugged ICP
I unplugged the ICP sensor and truck will not start. Also white smoke at start up. Could this be the cause of my rough idle upon start up?
 
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Old Dec 8, 2009 | 12:11 PM
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You need the ICP sensor plugged in. Rough idle at startup, particularly when cold, is usually injector or FICM related. Why did you unplug the ICP sensor???
 
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Old Dec 8, 2009 | 12:42 PM
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I was just trying to see what was causing rough idle.
 
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Old Dec 8, 2009 | 01:00 PM
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By randomly unplugging critical sensors? Do you mean you unplugged the EGR valve?
 
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Old Dec 8, 2009 | 07:30 PM
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Originally Posted by cartmanea
By randomly unplugging critical sensors? Do you mean you unplugged the EGR valve?

unpluging the icp and putting the truck in to default is a correct test for a idle concern. if the concern went away it would be a sensor/connector issue.
 
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Old Dec 8, 2009 | 10:19 PM
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Really? Never heard of that. So if the ICP sensor is bad and you unplug it the ECM idles at some default settings? Good to know.
 
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Old Dec 8, 2009 | 10:22 PM
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yup thats is one way to test a bias icp. you can drive it like that as well if needed but not really advised. so If you get stuck on the road its one thing to try.
 
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Old Dec 8, 2009 | 10:26 PM
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Thanks for the info. It must just default to an open-loop ICP control instead of using the sensor for closed-loop control.
 
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Old Dec 8, 2009 | 10:29 PM
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off the top of my head it defaults to 2800 psi. Ill check when i have a chance. I have a 6.4 to do a fuel system rebuild on for the next 2 or so days. so it will be a little while. also that will kick a cel for circuit hi/low but it will run and drive with out it. like I said it just goes default
 
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Old Dec 9, 2009 | 11:55 AM
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I already replaced EGR, so next thing I thought of was to unplug ICP.
 
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