RPM's Won't drop! - MustangForums.com


4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

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Old 05-06-2006, 03:44 AM   #2  
STANGLVR
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Default RE: RPM's Won't drop!

I think its your throttle positioning sensor
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Old 05-06-2006, 10:20 AM   #3  
BCisme
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Default RE: RPM's Won't drop!

that or you have a vaccum leak of some kind. do you have an aftermarket plenum? the C&L is known to leak and cause these problems, my car did.
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Old 05-06-2006, 10:55 AM   #4  
96GTmustang_man
 
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Default RE: RPM's Won't drop!

Idle Air Control possibly?
Your symptoms sound similar to the ones I was having when
mine was was dirty.
I took it off and cleaned it and fixed the problem.
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Old 05-06-2006, 12:48 PM   #5  
wwmost
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Default RE: RPM's Won't drop!

try cleanin the iac with carb cleaner.
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Old 05-06-2006, 06:04 PM   #6  
97targa
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Default RE: RPM's Won't drop!

Had the same problem..I replaced the AIC valve and didn;t fix it. I fussed with the TPS and fixed it.
I was running around 2200rpm and settled to 1600.
Unplug your TPS harness with the engine running to see if the rpm's drop.
If so it's your TPS.
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Old 05-06-2006, 06:19 PM   #7  
40thgtfl
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Default RE: RPM's Won't drop!

Idle Air Control x2
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Old 05-06-2006, 06:39 PM   #8  
chet sexington
 
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Default RE: RPM's Won't drop!

its probly in netural.
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Old 05-06-2006, 06:53 PM   #9  
Flyingmau5
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Default RE: RPM's Won't drop!

dont clean ur IAC... just replace the thing.
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Old 05-07-2006, 12:57 AM   #10  
rbstang
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Default RE: RPM's Won't drop!

clean IAC usually gets dirty and causes the rpms to hang during shifts. #1 problem in mustangs...
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