1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

rough idle

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Old

Dec 14, 2010 | 12:50 PM

#1

topdawgtrkr

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Joined: Feb 2009

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rough idle

My f250 with 4.9l will idle rough and almost kill when cold, i need to sit in the cab with my foot on the accelerator to keep it running once warm will idle fine.1990 with fi 5 speed 4x4

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Old

Dec 16, 2010 | 06:33 AM

#2

jemini

Tuned

Joined: Aug 2007

Posts: 287

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Sounds like the ECT is defective.

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Old

Dec 16, 2010 | 07:36 AM

#3

rla2005

Fleet Owner

Joined: Oct 2005

Posts: 20,783

Likes: 1,751

From: Kentucky

Get the engine up to operating temperature then follow this: Ford Fuel Injection » How To Run a Self-Test before throwing parts at the problem.

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1992, cold, ford, idle, rough, truck

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