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Topic: Throttle stuck??? scary (Read 2848 times) previous topic - next topic

Throttle stuck??? scary

when driving today i found somehting happen to me that really scared me.

when driving, out of nowhere i found my car slowly accelerating on its own.

at first i thought the pedal was stuck, but when i tried to tap the gas to get it back to normal, it didnt help.
the scary part is, since it was accelerating on its own, it was very hard to slow down. finally it stopped doing it and everything was back to normal.

later on when driving home, something similar happened but it wasnt nearly as bad. i put it in neutral and the car rev'ed up to 2200 rpm's on its own.

i tapped the gas and it went back to about 800 rpms like normal

it seams when it happens i have to put it into neutral and tap the gas to get it back to normal, tapping the gas when in gear makes no difference. it stays revving on its own

it isnt constant, so i dont know if it a TPS sensor, but if anyone has any ideas, i would love some help on this

Throttle stuck??? scary

Reply #1 –
could be with the cruise control
louie  :birdsmily:
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Throttle stuck??? scary

Reply #3 –
My van used to do that. casing on the throttle cable got damaged and it started rusting inside. check it out, it may need to be replaced.

edit: sometimes they gum up when old. guessing it's original?

check the cable to make sure it moves freely first, then we can narrow things down
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Throttle stuck??? scary

Reply #4 –
Umm, the ICM, if it's a 3.8, can do that for you too. It'll turn on and forget to turn back off. You don't even wanna think about buying one of those new.
 
If you have the 5.0 with EFI, it could be the IAB or IAC, which every you wanna call it. Once you open the throttle, the IAC opens fully. When you let off, it's supposed to slowly close to reduce emissions and prevent the drive-train from jerking. It's very possible that is sticking open when you're driving, and ultimately regulate idle speed. Tapping the throttle may be shaking it loose. Take it off, soak it overnight in Seafoam, then use a small plastic bottle brush to clean it thoroughly.  The one on my truck gave me the opposite problem, of sticking closed, which would cause stalling when I dropped throttle and pressed the clutch.
 
Hopefully, it is something as simple as the throttle cable. However, welcome to the realm of parts that are rare as hen's teeth. If this is your first Fox, you're gonna find it a real challenge to find parts for it.
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Throttle stuck??? scary

Reply #5 –
it could be the idle air control motor is sticking and my need to me cleaned . allso check it see if the throttle linkage needs some lubing and or if and object is in it's way..

one other thing which you might think is a joke but it's not is check the floor mat..
it's known to wedge the accelerator pedal not under it. but on the bottom of the pedal.. it happend to me and it allso happend to Will "weasle" back in like 2003 which i warned him about it when he said he was having the same problem with the throttle sticking and at first he did'nt beleave me untill his car drove him right into a gaurd rail! and said it was the DAMM FLOOR MAT!

again how this happends is the floor mat tends to ride up the floor pan over time when your heal is placed on it when you get in the car and when you lay your foot on the pedal..
and this how the bottom of pedal gets wedged on the top of the floor mat..
Quote
there's only about a half a dozen man made objects that are herd by the human ear below 40Hz,a pipe organ,thunder,the space shuttle lifting off,a jet airplane taking off or landing,a large canon,an atomic bomb ignited in your back yard and the heat wave afterward oh wait you would be dead so you would'nt hear it scratch that!,and maybe beating your hear against a wall less then 40 times a second..rap music is'nt one of them!thats 40-60Hz@100+db the moving air is under 40Hz

Throttle stuck??? scary

Reply #6 –
it is the 5.0 with the throttle body efi, it isnt the more modern efi that was in the late 80's birds. is this the same answers

Throttle stuck??? scary

Reply #7 –
IF it only went to 2200 RPM out of gear, I doubt the throttle cable is sticking... Sounds more like the TPS or idle motor has a problem... Checked it for codes???

As for floor mats yes they can cause a problem but likely the engine would rev to the limit... BTW, I tossed my floor mat as it ain't no fun when the throttle hangs at 80+ mph(which mine did at the drag strip)...

Throttle stuck??? scary

Reply #8 –
Quote
IF it only went to 2200 RPM out of gear, I doubt the throttle cable is sticking


Agreed.  I had the throttle cable stick on my long gone V6 car,  put it in neutral to get the car stopped.  The motor was SCREAMING.
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Throttle stuck??? scary

Reply #9 –
Next time it happens put it in neutral, pull over, open the hood and check it out. See if the throttle linkage is stuck.

Throttle stuck??? scary

Reply #10 –
bad motor mount?
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Throttle stuck??? scary

Reply #12 –
Quote from: youpey;224837
how could a bad motor mount cause this

Generally most mounts now days have a mechanical stop in the design to prevent the engine from raising more than a inch or so...

But back in the olden days, the throttle linkage would bind when the engine raised up, do to the bad mount and actually floor the pedal(I've seen them raise up 6" or more)...  Anyway it's not usually a problem with a cable setup...

I stand by my original post as the likely cause of your problem...
 

Throttle stuck??? scary

Reply #14 –
i made an appointment for next week with the garage, i couldnt figure out what was wrong with my e-brake, so i figured i would let them figure out what is wrong with the throttle. thanks guys

i will post up what they find