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Ford Truck Club Forum > FORD F-100 | F-150 SERIES > 1992-1996 Ford F150



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  #1  
Old October 7th, 2013, 06:16 PM
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bikertrash3531 bikertrash3531 is offline
 

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Default Surging idle, running rich, lunging at stops

Hey guys, been scratching my head on this and need y'alls input before I start throwing parts at it.

It seems I have developed a Surging idle. It will drop real low almost to the point of stalling, catch itself and rev back to normal. It will do this for about a minute to a minute and a half after start up.

Driving it, it is fine. Normal acceleration and cruising at any speed.

Sitting at a stop and in gear it will lunge forward against the brakes.

Have done the KOEO, KOER, and CBST. with nothing showing.

My thoughts are either O2, TPS, or IAC.

O2 isn't very old at all and I have not purchased a new IAC or TPS since owning either the 90 or 94.

Any thoughts appreciated.

Cleaned IAC, no change.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

  #2  
Old October 7th, 2013, 07:18 PM
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MAP sensor?

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
  #3  
Old October 7th, 2013, 08:48 PM
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I don't have one. I'm MAF. I thought about that as well but I'm almost sure it would throw a code. I do know from experience that the three senors above won't necessarily throw codes if out of range. Almost as if they need total failure to do so.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.

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Old October 7th, 2013, 11:24 PM
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I'd try cleaning the MAF.

2003 F-150 XL RCSB 2wd 4.2 5 speed 3.55 LS
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Old October 8th, 2013, 07:34 AM
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Did. I think I've covered all the quick fixes. I think I might just replace the IAC and TPS for & . Then maybe the O2 if the other two don't cure it.



1994 F150 XLT ExCab SB 306, 4R70w, 8.8 3.55 open, MSD StreetFire coil, Taylor Siro Pro wires, MSD cap and rotor, 1.72 Roller Rockers, 2º cam advance w/ Cloyes Street True Roller timing set, Flat top Hyperutectic pistons, Flowtech Long Tube headers, Xpipe, High flow Magnaflow converters, Spintech XL Sportsman DIDO muffler.



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idle , lunging , rich , running , stops , surging

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