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Author
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Topic: Hanging idle
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Bullitt3905
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Member # 905
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posted
 
 
Recently cleaned my IAC then replaced it because the idle was running choppy upon letting off accelerator and coasting.
After replacing it I used some throttle body cleaner and got the build up from around the edges of the throttle opening and butterflies. When i started it up the idle hangs at 1500 rpm. It will also sit at 1500 rpm when I'm coasting until I come to a stop then settles to 900. I also replaced the TPS WITH no luck. I checked the vacuum lines and they seem to look ok. I also readjusted my CAI and my maf looks clean. Any ideas? No engine codes are coming up on the dash diagnostic.
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2001 Mustang Bullitt #3905
SR springs, koni orange, steeda sts, magnaflows, 18" Bullitt wheels, grille delete, chin spoiler, 03 cf hood, JLT sri
Posts: 1067 | From: citrus heights, CA | Registered: Feb 2002
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Fostang
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Member # 3752
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posted
You probably just need to close the throttle blade a bit and adjust the tps.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3012 | From: Stockton/Danville | Registered: Nov 2003
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rollininmy50
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Member # 9067
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posted
When you replaced the Tps did you Recalibrate it?
Posts: 439 | From: sactown | Registered: Apr 2009
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Bullitt3905
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Member # 905
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posted
Nope. That's looking like my problem. In going to adjust voltage when I have a chance
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2001 Mustang Bullitt #3905
SR springs, koni orange, steeda sts, magnaflows, 18" Bullitt wheels, grille delete, chin spoiler, 03 cf hood, JLT sri
Posts: 1067 | From: citrus heights, CA | Registered: Feb 2002
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Bullitt3905
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Member # 905
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posted
Looks like the TPS is way high reading at 1.73v. How do adjust it? There's no way to drill wider holes on this one.
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2001 Mustang Bullitt #3905
SR springs, koni orange, steeda sts, magnaflows, 18" Bullitt wheels, grille delete, chin spoiler, 03 cf hood, JLT sri
Posts: 1067 | From: citrus heights, CA | Registered: Feb 2002
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Bullitt3905
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Member # 905
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posted
Bump? Any other way I can fix the idle?
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2001 Mustang Bullitt #3905
SR springs, koni orange, steeda sts, magnaflows, 18" Bullitt wheels, grille delete, chin spoiler, 03 cf hood, JLT sri
Posts: 1067 | From: citrus heights, CA | Registered: Feb 2002
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Fostang
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Member # 3752
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posted
Have you tried closing your throttle blade ![[Embarrassed]](redface.gif)
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3012 | From: Stockton/Danville | Registered: Nov 2003
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danterakin
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Member # 14040
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posted
Happened with my Bullitt. If you did not change your IAC with a Motorcraft one, do that first because the solenoids end up failing after time. If replaced, check for vacuum leaks (spray carb cleaner near hoses and see if there is a change in idle because if it changes, you have a leak), and also check O2 sensors. I went and changed all my emissions to new Motorcraft and I still had my RPM hand. Put new intake gasket, EGR, IAC, Plugs, thermostat, temperatur sensor, a lot of changed. None of them worked, ended up being my O2 sensors went bad and it fixed my issue. I'd bet anything your issue is a old and bad IAC.
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04 Mystichrome 836/736
9.79 @ 148 Stocklong Block
Posts: 29 | Registered: May 2015
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Bullitt3905
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Member # 905
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posted
I'll try putting in anther new IAC.
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2001 Mustang Bullitt #3905
SR springs, koni orange, steeda sts, magnaflows, 18" Bullitt wheels, grille delete, chin spoiler, 03 cf hood, JLT sri
Posts: 1067 | From: citrus heights, CA | Registered: Feb 2002
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