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Old 09-22-2012, 06:42 PM   #1
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High idle

I've noticed the past few days my car idles really high, sometimes when I put it in neutral it'll get up to 3000 rpm when coasting to a light then it'll slowly drop down, and while siting at idle it idles at around 1100-1300 rpm
Could this be my idle air control or a vacuum leak somewhere?
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Old 09-22-2012, 06:54 PM   #2
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Yea it could be either. If its a vacuum leak it's prolly an intake leak if I had to guess
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Old 09-22-2012, 08:56 PM   #3
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Re: High idle

Clean your MAF sensor first see how that works. If that doesn't work then clean TB.
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Old 09-22-2012, 09:16 PM   #4
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Re: High idle

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Originally Posted by maldog View Post
Clean your MAF sensor first see how that works. If that doesn't work then clean TB.
Sorry for hijack. Is there any negative effects of leaving tb on and spraying it? Will car smoke for a minute or anything to worry about?
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Old 09-22-2012, 09:23 PM   #5
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As long as you use throttle body an intake cleaner and NOT carb cleaner it will be fine but not while the car is running
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Old 09-22-2012, 09:34 PM   #6
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Re: High idle

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As long as you use throttle body an intake cleaner and NOT carb cleaner it will be fine but not while the car is running
^+1

I just did my TB with it on. It will start kinda weird rpm fluctuate for a few seconds, but then everything is normal.
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Old 09-23-2012, 01:59 AM   #7
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Re: High idle

Clean MAF, TB, and IAC...but it may be a vac leak
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Old 09-23-2012, 05:41 AM   #8
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Re: High idle

Rap on the IAC with that back of a screwdriver or something similiar while its running high at idle,,see if it doesnt bring the idle down,,sometimes if the IAC is stuck when you tap on it ,,the idle will come down
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Old 09-23-2012, 09:47 AM   #9
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Quote:
Originally Posted by Dgerow12
As long as you use throttle body an intake cleaner and NOT carb cleaner it will be fine but not while the car is running
What would carb cleaner do?
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Old 09-23-2012, 12:16 PM   #10
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Re: High idle

Its not sensor safe
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Old 09-23-2012, 12:34 PM   #11
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Re: High idle

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What would carb cleaner do?
Well some Ford throttle bodies are coated and the agressive agents in those solvents will dissolve the finish and ruin the throttle body.
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Old 09-23-2012, 01:12 PM   #12
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Re: High idle

they have throttle body cleaner but ive used citrious orange spray,,that seems to clean good and not to rough on the coating
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Old 09-23-2012, 01:16 PM   #13
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Quote:
Originally Posted by 1slosix
Its not sensor safe
It's not IAC safe? I never hit the maf with it
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Old 09-23-2012, 04:01 PM   #14
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Now when I push the clutch in the rpm climbs On It's own, and when coasting in gear it will keep the car going instead of slowing down
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Old 09-23-2012, 07:01 PM   #15
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Re: High idle

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Now when I push the clutch in the rpm climbs On It's own, and when coasting in gear it will keep the car going instead of slowing down
Tell us what you did to it?
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Old 09-23-2012, 08:34 PM   #16
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Quote:
Originally Posted by maldog

Tell us what you did to it?
I haven't done anything to try and fix it yet, it just seems like its getting worse as I drive
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Old 09-23-2012, 11:43 PM   #17
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Re: High idle

clean it..then let us know what it's doing
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Old 09-24-2012, 12:13 AM   #18
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Re: High idle

Mine did this after i got it tuned. Idk why, but it slowly got better.
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Old 09-24-2012, 03:31 AM   #19
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Quote:
Originally Posted by 1slosix
clean it..then let us know what it's doing
I have some throttle body/intake cleaner
Should that work? I'll do it in the morning
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Old 09-24-2012, 07:28 PM   #20
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My car did this when i had a bad splice on the tps harness after a windstar swap. After the solid cleaning of everything and a once over on all the vac lines if the problem still persists check the tps cuz maybe it's going bad also check to see if theres anything causing the butterfly not to close properly.
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Old 09-24-2012, 07:36 PM   #21
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Mine did this after i got it tuned. Idk why, but it slowly got better.
Thats probably just relearning,,I know mine still slightly fluctuates at idle in park,,but in drive its perfect,,and its so slight in park,,the rpms doent even move ,,but i can hear it a little bit
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