problem with stalling

ron98gt · July 31st, 2011, 09:49 AM

Ok, I just replaced the idel air control valve, the throttle positioning sensor, PCV valve & EGR valve and I still have this problem??? Any ideas on what to check next? When I first start the car it idles fine but soon as I bump the gas peddle the idle goes up (just over 1000 rpm and down (below 500 rpm) back'n forth until it stalls out or corrects it's self. I do have Cams so it is lopey at idle but normally does not stall out. It does not seem to be a vacume leak or at least I can't find one. I'll try anything to fix this...
Thanks for your imput.

OptionalStang · July 31st, 2011, 10:37 AM

you for got the main thing you should have done 1st...YOUR MAFS...these things are shit on these cars,prone to failure...how much boost you running and what kinda mafs you have?

ron98gt · July 31st, 2011, 11:00 AM

Originally Posted by OptionalStang

you for got the main thing you should have done 1st...YOUR MAFS...these things are shit on these cars,prone to failure...how much boost you running and what kinda mafs you have?

I'm only running about 8lbs and it is stock with a diablo MAFIA...

Blower Head · July 31st, 2011, 11:20 AM

I have been trying to cure a case of rolling idle ever since I put my supercharger on. Mine smooths out as soon as I put it in gear as I am running an automatic tranny. I am running a 90mm lightning maf and had my tuner spend a fair amount of time trying to cure it. I have heard that if you move your maf so it is blowing through it instead of pull through this can sometimes help.

bigjohnstud4200 · July 31st, 2011, 11:25 AM

What methods are you using to check for vacuum leaks?

Sent from my Nexus One using AutoGuide App

projectGT · July 31st, 2011, 02:12 PM

Tuned?

GMoney98 · July 31st, 2011, 03:40 PM

raise your idle and see if it keeps doing it. you can adjust with ur tuner or on the tb. i had the same problem untill i set my idle around 1000.

ron98gt · July 31st, 2011, 06:46 PM

Originally Posted by GMoney98

raise your idle and see if it keeps doing it. you can adjust with ur tuner or on the tb. i had the same problem untill i set my idle around 1000.

when I first start the car the idle will come down to 1000rpm with little movement but soon as I hit the peddle it goes up and then falls to 1000 rpm and then it dances between 400 - 1000 rpm and sometimes stalls out & sometimes it will fix itself. When driving the car it is fine with no hesitation until I come to a stop.
Maybe I should bump it up to 1200rpm's???/

ron98gt · July 31st, 2011, 06:51 PM

Originally Posted by projectGT

Tuned?

I had the car tuned this spring when I had a water meth kit installed. The car was running fine then had a small issue months later with the idle being to high (all on it's own no one had touched it) & now it is dropping to low & stalling out sometimes.

July 31st, 2011, 09:49 AM	#1
ron98gt Regular 1998 mustang GT Join Date: Apr 2006 Location: MA Posts: 78 iTrader: 0 reviews	problem with stalling Ok, I just replaced the idel air control valve, the throttle positioning sensor, PCV valve & EGR valve and I still have this problem??? Any ideas on what to check next? When I first start the car it idles fine but soon as I bump the gas peddle the idle goes up (just over 1000 rpm and down (below 500 rpm) back'n forth until it stalls out or corrects it's self. I do have Cams so it is lopey at idle but normally does not stall out. It does not seem to be a vacume leak or at least I can't find one. I'll try anything to fix this... Thanks for your imput. __________________ 98 gt blk on blk 90k miles with BBk 75mm throttle body, C&L plenum, Diablosport predator,powerdyne supercharger & a few other things.

July 31st, 2011, 11:20 AM	#4
Blower Head Regular 1996 Mustang GT Vert Join Date: Oct 2007 Location: blaine, MN Posts: 270 iTrader: 1 reviews	I have been trying to cure a case of rolling idle ever since I put my supercharger on. Mine smooths out as soon as I put it in gear as I am running an automatic tranny. I am running a 90mm lightning maf and had my tuner spend a fair amount of time trying to cure it. I have heard that if you move your maf so it is blowing through it instead of pull through this can sometimes help. __________________ 96 GT vert, Aftercooled Vortech, Lightning MAF,42# injectors, saleen cams, Bullitt intake, tune by Hitech, Magnaflow catback and O/R xpipe, Cobra brake upgrade, lowered bilstein suspension w/MM c/c plates and subframe connectors 3000 stall and 3.73's

July 31st, 2011, 03:40 PM	#7
GMoney98 Regular 1998 Mustang GT 13.22@106.42 Join Date: Apr 2009 Location: East Peoria, IL Posts: 149 iTrader: 0 reviews	raise your idle and see if it keeps doing it. you can adjust with ur tuner or on the tb. i had the same problem untill i set my idle around 1000. __________________ PI Heads & Intake\ Hitech Stage 2 Cams\ Borla Cat-Back\ O/R X pipe\ BBK Shorties\ 3.73 Gears\ BBK CIA\ BBK 78mm TB&P\ BBK U/P\ B&M Shifter\ Diablo tuned\ Eibach springs\ Tokico D-spec adj\ CC plates\ Eibach F/R sway bars\ Sub-F cn\ 290rw ponys

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July 31st, 2011, 10:37 AM	#2
OptionalStang Banned 1997 cougar 4.6 1/2PI TooFast4theFUZZ Join Date: May 2011 Location: se wi Posts: 991 iTrader: 1 reviews	you for got the main thing you should have done 1st...YOUR MAFS...these things are shit on these cars,prone to failure...how much boost you running and what kinda mafs you have?

July 31st, 2011, 02:12 PM	#6
projectGT Regular 1996 mustang GT Join Date: Mar 2011 Location: vandenberg afb, ca Posts: 357 iTrader: 1 reviews	Tuned?

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