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post #1 of 13 (permalink) Old 11-02-2007, 04:11 PM Thread Starter
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Thumbs down car accelerates on its own

while driving my car will try to die and then it accelerates on its own same thing on reverse , i cant drive it anywhere because it will die and its scary when it tries to speed on its own , what could it be guys ?

btw 93 sc
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post #2 of 13 (permalink) Old 11-02-2007, 04:41 PM
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check your vac lines

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post #3 of 13 (permalink) Old 11-02-2007, 04:46 PM Thread Starter
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they all look nice and tight and they all have zip ties on them
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post #4 of 13 (permalink) Old 11-03-2007, 05:00 AM
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Sounds like the IAC is going out. It did the same thing in my 89 when it went out, and also in my 5.0 when it did.

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post #5 of 13 (permalink) Old 11-03-2007, 12:57 PM Thread Starter
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ya i was thinking that too and some members at sccoa told me about it , but they also said that if i disconnect the iac while running the car should stall , that means it should be doing its job , mine stalls when i disconnect it.
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post #6 of 13 (permalink) Old 11-03-2007, 03:36 PM
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does it only do it when it warms up? The 89-93 design, the insides of em were plastic, the new and improved design on the 4.6l were metal. I disconnected mine too and it stalled. Let it warm up, then disconnect it.

1997 Mercury Cougar XR7 Sport 4.6L
P.I. Intake, Mustang T/B and Upper Plenum,B&M Heavy Duty Trans Cooler, Trans Temp Gauge, A/F Ratio Gauge, K&N Cone Filter, Air Silencer Delete, 50% Front 20% Rear Tint, A&A Fiberglass GFX Kit, Xenon Front Clip, Magnaflow High Flow Cats

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post #7 of 13 (permalink) Old 11-04-2007, 03:56 PM Thread Starter
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ok will try that thanks
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post #8 of 13 (permalink) Old 11-05-2007, 06:38 PM
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my 2004 3.8 mustang used to do that...throttle would stick while slowing down or would bog down--car was in Neutral...never could quite get it right and didn't trust the stealership to not F anything up with warrentee work so didn't fix it...
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post #9 of 13 (permalink) Old 11-09-2007, 12:21 AM
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my moms windstar does the same thing. im thinking it has a vaccum leak because when i first start it, it will jump up to about 2k for about 3 seconds then slowly decrease to about 1100 RPM's then will stay there for about 1 minute and hit its idle at about 700-800 rpms

any idea?
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post #10 of 13 (permalink) Old 12-05-2007, 09:06 PM
 
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ok if it is the IAC , it should make a sound like a goose on Crack LOL and yea i agree IAC mine did the same thing about 8 month ago
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post #11 of 13 (permalink) Old 01-23-2008, 09:18 PM
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another vote for the IAC. If you get a new one, make sure it specific for your car. If it doesnt look the same as stock then dont even waste your time. I know this from experience.
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post #12 of 13 (permalink) Old 01-23-2008, 09:53 PM Thread Starter
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sry i didn't post back, mine was a ground problem , negative battery post to radiator frame ..

but then again i replaced the iac and tps when i replaced the supercharger assy from another car

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post #13 of 13 (permalink) Old 01-23-2008, 10:16 PM
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Originally Posted by Destructor90 View Post
ok if it is the IAC , it should make a sound like a goose on Crack LOL and yea i agree IAC mine did the same thing about 8 month ago
why do you say this? mine occasionally makes this loud humming noise that increases/decreases with a slight movement of the throttle, but a quick jab of the throttle will cause it to go away. I know my IAC is bad because I do get a high idle occasionally (only when its warmer out it seems.) I originally thought it was a small vacuum leak I had, but after replacing the line it still has done it. why would the IAC cause this?

BTW, this is on a 94 4.6, not a SC.

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