Rough Idle
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New User
Joined: Apr 2004
Posts: 7
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Rough Idle
I just bought a 1989 F250 with fuel injection. It idles rough and burns rich. Sometimes it will stall when I stop at a light. This thing acts just like a carb would act with a stuck automatic choke. I have never owned an older vehicle with fuel injection before, so could somebody give me some ideas where to start on this project. Thanks for any help. ED
Junior User
Joined: Feb 2004
Posts: 58
Likes: 0
From: Houston Area TX
I would start with the basics just like with a carb truck. Check the base timing set to factory specs (10 deg BTDCon a 5.0L, not sure with yours (don't forget to pull the SPOUT connector)). Look for vacuum leaks. Also check for cracks/condensation in the distributor cap, fouled rotor, cross firing on the plug wires, make sure all 8 spark plugs are firing by pulling the wire and arcing to the plug. (use insulated pliers or plug/wire pullers 
)Then pull the codes off the computer, since that's what sets your air/fuel ratio.
)Then pull the codes off the computer, since that's what sets your air/fuel ratio.
Last edited by 93superflare; Apr 25, 2004 at 09:26 PM.
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Senior User
Joined: Dec 2003
Posts: 354
Likes: 1
From: Memphis, TN USA
It might be your IAC. Try removing it and clean it with a throttle body cleaner and clean the spot where the IAC goes in to the throttle body. Test it and see if that makes a difference and if not might be time to get a replacement IAC.
