88 7.5 rough idle

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Mar 11, 2013 | 05:33 PM

vtjvt

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Joined: Sep 2006

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From: Bountiful UT

88 7.5 rough idle

Hey all, My 88 F250 Idles real rough when starting cold. Never dies and I can take right off and it drives fine. I did have a Slight miss when under power but after running the codes (code 31) and replacing the egr position sensor The miss went away. Now it just idles rough Once warm it idles fine And it isn't showing any more codes weather koeo or koer. Idles around 700 when first starting in the mornings
Any Ideas???

Mar 11, 2013 | 06:31 PM

kermmydog

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Joined: Oct 2003

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From: Western Central NV

Have you tried some injector cleaner in the gas tank? I like to run Lucas Injector cleaner fairly often. If nothing else is lubes the in-tank fuel pumps.
Craig

Mar 11, 2013 | 07:48 PM

bigcrunch

Tuned

Joined: May 2007

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Check your dist cap contacts for corosion and wear. Also vacumn leak possible.

Mar 11, 2013 | 08:07 PM

kegomatix

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Joined: Aug 2012

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My 5.8 was doing the exact same thing. New EVR and TPS and it fires up and idles fine.

Mar 11, 2013 | 10:23 PM

vtjvt

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From: Bountiful UT

Thanks for the input guys. I run seafoam through it every few months cap and rotor are a year or so old, will check them out.

Mar 24, 2013 | 04:16 PM

vtjvt

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From: Bountiful UT

Quick update. I have checked and Replaced TPS sensor (had dead spots) Checked for vaccum leaks (none found) and the cap and rotor look fine. I also pulled and cleaned the IAC. No codes and it runs perfect when driving But it still idles like crap. Any more ideas??? Kinda sounds like it has a big old race cam in it. LOL