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so basically when i turn on my a/c or defroster my rpms fluctuate from 400-1200. this just started happening after i installed my c&l plenum. that or since it got really cold all of a sudden here and i never had idle probs in the hot weather, that it could be a cold weather problem but i seriously doubt it. i have an sct tuner and i have my idle set at 620ish and the car will idle perfect except when my compressor is activating. so im assuming that my iac is all messed up somehow. when i installed my plenum i was very very careful with that gasket and i dont think i damaged it. but i did notice that the rubber hose coming off of it was nasty looking and had tiny hairline fractures. could that be it. the fractures causing a vacuum leak? or would that throw off my idle all the time and not just when the compressor is running
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2001 mustang gt
'95 cobra r wheels. 275 front. 315 rear.
bbk 75mm tb. C&L plenum. new intake manifold.
no mufflers no cats. 10th anny cobra front brakes
1250w infinity sub. 350w kicker amp. pioneer system.
sub frame connectors. aluminum control arms.
pro 5.0 sts. sct tuned
and the best mod of all: 3.73's
Sounds like you have a vacuum leak in your climate control hoses and not a problem with the IAC.
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CMS stage 2's,comp springs,and Bullitt intake waiting for install.
Looking for focus fuel pump and ported heads.PM me if you have any.
If it were your IAC you would be getting other symptoms (Most likely stalling or other throttle issues).
Of course, there is no harm in checking. Pull it off and be sure that the spring and valve move freely. Spraying tune up cleaner inside can free it if a little light corrosion is to blame or coking. Although, like I said I don't believe it's your IAC. I'd go with vacuum leaks as well.
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Red 1996 GT
PI Swapped
BBK Shorty Headers
Pypes HFC'd X Pipe
Magnaflow Catback
Fender-Well CAI
Hurst Billet Aluminum Shifter
Rear Window Louver
Drilled/Slotted Rotors with High Perf. Pads
Hood Pins!
Sequential Tail Lights
Awful Looking Stock Rims Painted Gun-Metal
well im gonna check my iac in the morning. and then ill look for a vacuum leak. i swear it has something to do with my c&l plenum since it started happening after that swap or pretty much around the same time. ill get back to you guys tomorrow. thanks
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2001 mustang gt
'95 cobra r wheels. 275 front. 315 rear.
bbk 75mm tb. C&L plenum. new intake manifold.
no mufflers no cats. 10th anny cobra front brakes
1250w infinity sub. 350w kicker amp. pioneer system.
sub frame connectors. aluminum control arms.
pro 5.0 sts. sct tuned
and the best mod of all: 3.73's
Be sure to check all vacuum lines attributed to the Plenum. There are several lines off of the intake which could very easily cause a substantial leak. Check all lines/hoses before your IAC.
__________________
Red 1996 GT
PI Swapped
BBK Shorty Headers
Pypes HFC'd X Pipe
Magnaflow Catback
Fender-Well CAI
Hurst Billet Aluminum Shifter
Rear Window Louver
Drilled/Slotted Rotors with High Perf. Pads
Hood Pins!
Sequential Tail Lights
Awful Looking Stock Rims Painted Gun-Metal
so i checked for vacuum leaks on and all around any lines that could use vacuum. i used wd-40 and sprayed all over. i found nothing. no idle changes. should i use starting fluid instead? or perhaps i should check my climate control vacuum lines...they are controlled by vacuum right? how would i go about doing that
update: cleaned my iac just for kicks. made no difference
__________________
2001 mustang gt
'95 cobra r wheels. 275 front. 315 rear.
bbk 75mm tb. C&L plenum. new intake manifold.
no mufflers no cats. 10th anny cobra front brakes
1250w infinity sub. 350w kicker amp. pioneer system.
sub frame connectors. aluminum control arms.
pro 5.0 sts. sct tuned
and the best mod of all: 3.73's
Last edited by masterofthepuppets99; 10-24-2009 at 05:23 PM.
Use starting fluid and, like you said check for idle changes. If you have a serious enough vacuum leak it should rev up a bit. Spray around any suspected areas.
__________________
Red 1996 GT
PI Swapped
BBK Shorty Headers
Pypes HFC'd X Pipe
Magnaflow Catback
Fender-Well CAI
Hurst Billet Aluminum Shifter
Rear Window Louver
Drilled/Slotted Rotors with High Perf. Pads
Hood Pins!
Sequential Tail Lights
Awful Looking Stock Rims Painted Gun-Metal
Pull out your climate control and see if you can see or hear any leaks behind your dash.I wouldnt spray anything in there because you'll be smelling if for awhile if you do.Try carb cleaner instead of WD or starting fluid.
__________________
CMS stage 2's,comp springs,and Bullitt intake waiting for install.
Looking for focus fuel pump and ported heads.PM me if you have any.
thanks alot. i will increase my idle. and ill will try carb cleaner tomorrow( well i guess today lol). ill also pull out my climate controls and take a look around
__________________
2001 mustang gt
'95 cobra r wheels. 275 front. 315 rear.
bbk 75mm tb. C&L plenum. new intake manifold.
no mufflers no cats. 10th anny cobra front brakes
1250w infinity sub. 350w kicker amp. pioneer system.
sub frame connectors. aluminum control arms.
pro 5.0 sts. sct tuned
and the best mod of all: 3.73's
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is my idle air controller all jacked up?
