Engine Surging at Idle
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Junior User
Joined: Jun 2011
Posts: 97
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From: St. Martinville, La.
Engine Surging at Idle
04 6.0L here. Engine is surging about 200-250 rpms at idle. My truck normally idles at around 600-650 rpms. I have been getting a surge when it is idling. The surge usually drops to about 500 rpms the goes up to 750. It usually does it after it warms up. If I turn on the high idle it runs fine with no surge. Any suggestions?
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Junior User
Joined: Jun 2011
Posts: 97
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From: St. Martinville, La.
It's a late 03 motor and the ICP sensor is under the turbo. I will try cleaning the contacts to see if that helps. Would it usually throw a code? I will check for codes tonight.
Hotshot
Joined: Dec 2003
Posts: 15,369
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From: Stuttgart, Ar
It usually throws a P2285 for the ICP. Try disconnecting the sensor and see if it still surges. Also, if the connector is full of oil then the sensor is leaking and needs to be replaced but not full of oil doesn't mean the sensor isn't bad either.
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Junior User
Joined: Jun 2011
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From: St. Martinville, La.
Thanks. I will check out the ICP tonight. I have become a pro at getting it out of there. I can have the ICP and the IPR out in about 15 minutes when the engine is cold and that is without the special socket for the IPR and without the truck on a rack/lift. LOL
Junior User
Joined: Jun 2011
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From: Denver CO
The wiring harness and the pigtails that plug on to the various engine sensors are connected by crimps (probably assembled in Mexico,....which could explain part of the problem). Check for a bad connection here before throwing too many new parts at it. Wiggle the wires while the engine is running and see if it acts up. When you solve the problem please post again.
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Junior User
Joined: Jun 2011
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From: St. Martinville, La.
There were no codes. I unplugged the ICP and the plug was a slightly oily. I cleaned it with contact cleaner and plugged it back in. The surge is intermittant so I have to drive it a while to see if it contiues. I am assuming since the plug was a lil oily that the ICP is definitely leaking a needs to be changed?
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Joined: Mar 2008
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From: Raleigh, NC
x2 on icp, It will not always activate check engine light, and on my truck the p2285 code was intermittently stored as a pending code. I had surging at idle and on the highway, very random maybe once a week, I changed the icp and cleaned the oil on the connector and no problems since.
Logistics Pro
Joined: Mar 2007
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From: Claremore, OK
There were no codes. I unplugged the ICP and the plug was a slightly oily. I cleaned it with contact cleaner and plugged it back in. The surge is intermittant so I have to drive it a while to see if it contiues. I am assuming since the plug was a lil oily that the ICP is definitely leaking a needs to be changed?
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