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Recently when I start my 80,000-mile '96 Duratec ATX after it's sat for most/all of a day or days, it'll idle just fine for a few seconds, then it'll stumble and if the a/c is on or it's in gear, it'll quit. If I give it gas, it recovers for several seconds, then does it again, for most of a minute or so until it gets some heat. NOTE: Several months ago I did the whole intake manifold gasket/seal fix thing and when I did I cracked the secondaries open as suggested. I don't *think* that's a big contributor to the problem becuase it only cropped up recently. is this a symptom of a bad IAB/IAC/ISC?
Pacific Green '96 Contour LX V6, loaded
'98 Grand Prix GTP 14.88/91 bone stock, awaiting new times from 3.4 pulley, CAI, U-bend removal but it's creeping up on the...
Calypso Green '92 Mustang LX coupe, 13.56/101
3-time local class champion autocrosser
Racing school whore
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I had the EXACT same situation for about 15k miles. In retrospect, they think it might be that the head gasket was leaking just enough to make a plug damp, and then it would dry out with some heat from the engine. (And it only recently decided to give way!)  Not 100% sure, but it makes sense. Obviously, there are MANY less sinister possibilities.
98 Contour GL (Champagne)
Zetec / ATX
Mods: Blown head gasket
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I would suspect an IAC problem or a possible leak on the intake somewhere.
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Joined: Apr 2001
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Pacific Green '96 Contour LX V6, loaded
'98 Grand Prix GTP 14.88/91 bone stock, awaiting new times from 3.4 pulley, CAI, U-bend removal but it's creeping up on the...
Calypso Green '92 Mustang LX coupe, 13.56/101
3-time local class champion autocrosser
Racing school whore
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Joined: Feb 2002
Posts: 59
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What is IAC ? tw0wheelin
Member # 736 posted July 11, 2002 04:17 PM
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I would suspect an IAC problem or a possible leak on the intake somewhere.
1996 Contour GL Zetech no add on's just stock a plan jan lol
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<>
Idle Air Controller...Attached to the back of the Upper intake manifold with 2 bolts.
See Ya,
Bito
98 Contour SE Sport ATX
lightly modded... =0)
14.1 @ 98MPH 1/4 mile!!!
New Version 3.0 inside =0)
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Mine was exhibiting similar symptoms and it turned out to be a contaminated MAF (Mass Air Flow) sensor. If you were using any type of intake cleaning chemical that leaves a residue and this chemical contacted the sensor wire in the MAF, this could be your problem.
Regards, Art
99 Silver Frost SVT (1456/2760)
Ray McNairy's TH Fix
Bullitt Mustang fuel hatch
Bill Jenkins' "off color" floor mats
K&N
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I'm only judging from zetec experience here, but I think this could be caused by any of a variety of things that cause a mild or moderate lean condition -- the most likely candidates being, I would guess, either a vacuum leak or a bad or dirty MAF. If it gets worse maybe you'll see a CEL.
96 GL Zetec ATX, white with pinstripe, nickname " Sam Smooth " mods so far: CTA intake with homemade heat shield, KVR drilled front rotors & carbon pads w/ 500° fluid planned mods: exhaust (want to keep it quiet), e-ram (awaiting installation), diablo chip involuntary mods: compression increased after head gasket failure
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