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Old December 7th, 2009, 05:15 PM   #1
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Default 96 f250 idle and surge problem

Have a 96 f250 4x that has an erratic idle speed when warm and surges while driving. Any suggestions?
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Old December 7th, 2009, 07:27 PM   #2
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what engine??
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Old December 7th, 2009, 11:07 PM   #3
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Idle air solenoid? Throttle position sensor? Easiest way is to get the codes read. It will usually point you in the right direction.
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Old December 7th, 2009, 11:09 PM   #4
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vacuum leak
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Old December 7th, 2009, 11:14 PM   #5
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IAC- idle air control possibly. Is there a MIL light on
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Old December 7th, 2009, 11:20 PM   #6
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engine is a 351 Windsor. We can't get it to code?! I replaced the idle control solenoid and it help for a short period of time but is now acting the same as it did before the change.
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Old December 7th, 2009, 11:22 PM   #7
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check the connector on the harness
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Old December 7th, 2009, 11:23 PM   #8
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vwBOY, that is the part I am after tomorrow, Thanks.
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Old December 7th, 2009, 11:26 PM   #9
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connector on which harness
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Old December 7th, 2009, 11:30 PM   #10
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that plugs into the idle air control trace the wire to see if it has a open and check the connector for corrosion
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Old December 7th, 2009, 11:55 PM   #11
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A bad TPS won't always throw a code. It may only be bad at a few points of the range. I'd test that, too.

When is the last time it was tuned up? I've had similar issues from bad coils, wires, and even weak contact of the cap and rotor(spring on the top of rotor).
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Old December 8th, 2009, 08:11 AM   #12
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2000 miles since a complete tune-up with all the things you have mentioned. I am still chasing this problem! All the suggestions are greatly appreciated! Thanks
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Old December 8th, 2009, 10:11 AM   #13
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Quote:
Originally Posted by Bc1980 View Post
vacuum leak
x2

check the lower intake gasket at the back of the engine

put a vacuum guage on it at idle
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Old December 8th, 2009, 03:22 PM   #14
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IAS replaced and no change. Thanks for the suggestion.
It has been so long since I haved worked anything that isn't all clustered up with switches and sensors sometimes I overlook the simple, it indeed may be an intake leak. Thanks again guys.
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Old December 8th, 2009, 09:45 PM   #15
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What about the fuel filter? Have you ever changed it? Its getting cold outside and it may just be plugged up with moisture and dirt.
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Old December 8th, 2009, 10:07 PM   #16
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check the power brake booster - if bad, you get a vacuum leak (usually when foot is on brake). Usually surges due to lean condition, engine goes rich and surges.
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Old December 9th, 2009, 05:17 PM   #17
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did you check for carbon build up behind throttle blade? Did you clean the carbon out of the I.A.C. passage?
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