Up and Down idle

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May 20, 2010 | 05:05 PM

fordpride

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Joined: Dec 2009

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From: Livoina,La

Up and Down idle

started yestersay was coming to a stop and truck died but fired right back up but now when sitting at a red light or just idling my RMP will drop down to 400 r 500 the back to normal and then keep repeating but it hasn't died again(for know) any one have a clue what would cause this.

Thanks in avance.

May 20, 2010 | 05:14 PM

redman84

Cargo Master

Joined: Feb 2010

Posts: 2,526

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From: College Station, TX

Could be the CPS

May 20, 2010 | 05:22 PM

fordpride

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From: Livoina,La

I have a new one in the box i'm waiting for the truck too cool a little.

May 20, 2010 | 05:33 PM

Action4478

Hotshot

Joined: Aug 2006

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Check the oil level in the C case. Also , unplug the ICP sensor ,look for oil seeping from it..

May 20, 2010 | 06:19 PM

fordpride

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From: Livoina,La

oil level is fine but i do have oil in the ICP guess that means it's time for a new one or five finger special from the junk yard

May 22, 2010 | 09:48 PM

fordpride

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From: Livoina,La

Alright guy's figure this one out. I changed GPR and it fixed my idle problem so i thought i was losing my mind so i put the old one back on and my idle went back to going up and down put hte new one back on and it idle perfect what the h#ll how can a bad GPR mess with the idle