Surges

94blakonblak · June 25th, 2009, 11:59 PM

So, my car has been getting bad gas milage, not sure if its cause of running ac more, or what. Also it has been surging and running rough at idle. No codes been trown recently, just replaced plugs and air cleaner. You guys have any suggestions?? Oh and should I be able to feel heat coming up though my consol after driving around for a while.

ModularSteed · June 26th, 2009, 12:02 AM

IAC for idle surging

94blakonblak · June 26th, 2009, 12:08 AM

Ok, its not huge, but sometimes I can tell and occassionally itll even shut off, especially in reverse, or maybe i just suck at driving ha

ModularSteed · June 26th, 2009, 12:13 AM

lol i would need more detailed info for a proper diagnosis attempt

94blakonblak · June 26th, 2009, 12:16 AM

Okay lets see, it flashed codes earlier this year, but it stopped eventually. Well i ran ac a few times and my gas milage droped from 18-20 to 15-17. Also the idle surges just a tad when sitting at a stop sign, and it likes to die on me in reverse sometimes. But it suns fairly well. Ive only had it a few months. Could it need o2 sensors??

treblruh · June 26th, 2009, 02:24 AM

Originally Posted by 97stang4.6l

IAC for idle surging

^Agreed, try taking it off and cleaning it with some carb cleaner and cuetips or somthing. I did it to my old car and the surge stopped. Also might wana clean MAF while your under the hood.

95project · June 26th, 2009, 10:46 AM

15-17 is average for these cars...you were lucky to see 18-20. IAC should be your first check about the idle.

Lind · June 26th, 2009, 11:30 AM

well with your ac on your car is going to lug alittle at the stop sign but only for a few seconds and then when the compressor kicks in it should tell the car to jump the idle up to 1100 to 1300 rpms

it shouldnt be dieing in reverse unless you arent giving it gas lol, as soon as i let the clutch out in reverse i dont ever have to touch the gas again, just the brake for the most part lol

94blakonblak · June 26th, 2009, 01:30 PM

Thanks guys. I'll check the IAC ive cleaned the maf once now, but hey why not do it again ha

WildWill · June 26th, 2009, 05:49 PM

mine doesn't idle very well with the a/c on as well... as stated, the idle is supposed to jump up when the compressor kicks on... is this not happening a result of a bad or dirty IAC? what senses that the compressor is on?

95BlackStang · June 26th, 2009, 09:21 PM

the ccrm is what control the ac circuit.

June 25th, 2009, 11:59 PM	#1
94blakonblak Regular 1994 Mustang Gt Soon to come Join Date: May 2009 Location: Starkville/Southaven Posts: 321 iTrader: 0 reviews	Surges So, my car has been getting bad gas milage, not sure if its cause of running ac more, or what. Also it has been surging and running rough at idle. No codes been trown recently, just replaced plugs and air cleaner. You guys have any suggestions?? Oh and should I be able to feel heat coming up though my consol after driving around for a while. __________________ "Train hard, kill everyone, ask questions later"...94Gt,Trickflow 170's,Trackheat upper/lower, custom cam. In need of suspension work.

June 26th, 2009, 12:08 AM	#3
94blakonblak Regular 1994 Mustang Gt Soon to come Join Date: May 2009 Location: Starkville/Southaven Posts: 321 iTrader: 0 reviews	Ok, its not huge, but sometimes I can tell and occassionally itll even shut off, especially in reverse, or maybe i just suck at driving ha __________________ "Train hard, kill everyone, ask questions later"...94Gt,Trickflow 170's,Trackheat upper/lower, custom cam. In need of suspension work.

June 26th, 2009, 12:16 AM	#5
94blakonblak Regular 1994 Mustang Gt Soon to come Join Date: May 2009 Location: Starkville/Southaven Posts: 321 iTrader: 0 reviews	Okay lets see, it flashed codes earlier this year, but it stopped eventually. Well i ran ac a few times and my gas milage droped from 18-20 to 15-17. Also the idle surges just a tad when sitting at a stop sign, and it likes to die on me in reverse sometimes. But it suns fairly well. Ive only had it a few months. Could it need o2 sensors?? __________________ "Train hard, kill everyone, ask questions later"...94Gt,Trickflow 170's,Trackheat upper/lower, custom cam. In need of suspension work.

June 26th, 2009, 10:46 AM	#7
95project Enthusiast Join Date: Oct 2007 Location: Memphis TN Posts: 609 iTrader: 0 reviews	15-17 is average for these cars...you were lucky to see 18-20. IAC should be your first check about the idle. __________________ 95 GT- AFR 185's, Comp CAM, Trick FLow TH upper and lower, 30lb injec, 76MM C&L kit, Full MSD, BBK Pulleys, 3:73, BBK Long Tubes, X Pipe, Magnaflow Cat back, Cobra front control arms, MM CC plates LCA's and Panhard bar, tuned by Adam @ Pops Racing.

June 26th, 2009, 11:30 AM	#8
Lind Enthusiast 1994 Ford Mustang GT Join Date: Sep 2006 Location: Shawano, WI Posts: 579 iTrader: 0 reviews	well with your ac on your car is going to lug alittle at the stop sign but only for a few seconds and then when the compressor kicks in it should tell the car to jump the idle up to 1100 to 1300 rpms it shouldnt be dieing in reverse unless you arent giving it gas lol, as soon as i let the clutch out in reverse i dont ever have to touch the gas again, just the brake for the most part lol __________________ www.moddedmustangs.com

June 26th, 2009, 01:30 PM	#9
94blakonblak Regular 1994 Mustang Gt Soon to come Join Date: May 2009 Location: Starkville/Southaven Posts: 321 iTrader: 0 reviews	Thanks guys. I'll check the IAC ive cleaned the maf once now, but hey why not do it again ha __________________ "Train hard, kill everyone, ask questions later"...94Gt,Trickflow 170's,Trackheat upper/lower, custom cam. In need of suspension work.

June 26th, 2009, 05:49 PM	#10
WildWill Hardcore Enthusiast 1995 Mustang GT Join Date: Oct 2007 Location: Solomons, MD Posts: 1,112 iTrader: 0 reviews	mine doesn't idle very well with the a/c on as well... as stated, the idle is supposed to jump up when the compressor kicks on... is this not happening a result of a bad or dirty IAC? what senses that the compressor is on? __________________ GT40p heads, 1.7 crane RR's, GT40 u/l, MAC LTs, MAC o/r h-pipe, Flowmaster 40s, 65mm t/b, '03 Cobra Bilstein Struts, Tokico Bullitt Shocks, MM c/c plates, Eibach Sportlines, B&M shifter, 255lph f/p, RAM p/g clutch, Fidanza alum fly, rebuilt t-5

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