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Discussion Starter · #1 ·
Battery and alternator voltage is fine.

FICM tests 46 volts cold at idle.

The truck runs and starts the same with the ICP sensor connected or not.

Symptoms:

Longer than normal cranking to start, and rough idle that makes the cab bounce up and down.

I do not have a way to monitor all of the parameters at this time. However I have the wi fi connector for the Torque app in the mail.

Any ideas?

Thanks
 

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Fixing Broken Stuff
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You don't have enough information to make a more positive diagnosis. The torque app will help you with diagnosing your problem. When you get it working scan it and see what codes you have first. Then watch ICP when cranking and see what is happening.
Do you have a early 04 with the ICP sensor in the HPO cover? if so those are usually leaking oil in to the connector, and that will cause drive-ability problems, if not you probably have some type of ICP or injector issue.
 

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Registered
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Discussion Starter · #3 ·
You don't have enough information to make a more positive diagnosis. The torque app will help you with diagnosing your problem. When you get it working scan it and see what codes you have first. Then watch ICP when cranking and see what is happening.
Do you have a early 04 with the ICP sensor in the HPO cover? if so those are usually leaking oil in to the connector, and that will cause drive-ability problems, if not you probably have some type of ICP or injector issue.
It is a later 04 with the ICP on the valve cover.

Thanks
 

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Fixing Broken Stuff
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2,078 Posts
If it still has the EGR system on it try to clean it and clear the keep alive memory. If that doesn't do it you need to do a cylinder balance test.
 
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