dropping rpms

rocket · August 19th, 2006, 07:31 PM

my '90 GT drops the rpms when idling occ, not all the time, and occ. will die because it idles so low. Usually only happens when the AC is on, if you turn it off, usually stops. Any thoughts on what would be causing this?

Anthony · August 19th, 2006, 08:02 PM

what does it idle at, 600-800 rpms? u can bring it higher if its too low. have u checked all ur vac lines, cleaned maf, etc.

Vamp89 · August 19th, 2006, 08:52 PM

Could bump it up, check tps sensor, iac, etc.

vfast · August 19th, 2006, 10:49 PM

I would set it a 800 then set the tps to .99 volts..get a can of seafoam... I would clean the T/B and egr as well as the maf if using a K/N filter..

rocket · August 20th, 2006, 10:09 AM

well, it doesn't idle low, it just drops the rpms/volts then it bounces back up, and it does this over and over usually until I turn the a/c off. it doesn't cont. idle low. sometimes it bounces so low that it dies. could it be electical or some sensor?

IcantDo55 · August 21st, 2006, 01:53 AM

Look for the idle setting procedure on here and try it.

stang fanatic · August 21st, 2006, 09:46 PM

http://wind.prohosting.com/hotparts/t0000004.htm

August 19th, 2006, 07:31 PM	#1
rocket Regular 1990 Mustang GT Join Date: Aug 2006 Location: Ankeny, IA Posts: 88 iTrader: 0 reviews	dropping rpms my '90 GT drops the rpms when idling occ, not all the time, and occ. will die because it idles so low. Usually only happens when the AC is on, if you turn it off, usually stops. Any thoughts on what would be causing this?

August 19th, 2006, 08:52 PM	#3
Vamp89 Regular 1989 Mustang GT Join Date: May 2006 Location: Indiana Posts: 194 iTrader: 0 reviews	Could bump it up, check tps sensor, iac, etc. __________________ Ported Saleen Vortech Intake BBK 70mm t/b,BBK CAI,BBK Reg,BBK 255 Fuel Pump Hooker Super Comp Long-tube Headers Fcam Ported Motorsport J302 Heads 30# Injectors 1.6rr 80mm Mass Air 4:11 gears

August 19th, 2006, 10:49 PM	#4
vfast Banned Join Date: Aug 2005 Location: shimmy shack takeout Posts: 1,084 iTrader: 0 reviews	I would set it a 800 then set the tps to .99 volts..get a can of seafoam... I would clean the T/B and egr as well as the maf if using a K/N filter.. __________________ EVERYONE IS ENTITLED TO MY OPINION:cool: 6'ers are for kids 1965 chevelle SS 421 sbc 6 speed, 3.90 gears,alum d-shaft, brodix heads,roller cam,925 AED carb...grocery getter[COLOR="Red"]RIP[/COLOR]

August 21st, 2006, 01:53 AM	#6
IcantDo55 Enthusiast Join Date: Aug 2005 Location: Va Beach VA Posts: 590 iTrader: 0 reviews	Look for the idle setting procedure on here and try it. __________________ -Mike Link to My Site Want to Play Some Pool??? Stroked and Blown!

August 21st, 2006, 09:46 PM	#7
stang fanatic Enthusiast Join Date: May 2006 Location: El Paso, Tx Posts: 861 iTrader: 0 reviews	http://wind.prohosting.com/hotparts/t0000004.htm __________________ "The gods too are fond of a joke." "If I had only known, I would have been a locksmith. "

August 19th, 2006, 08:02 PM	#2
Anthony Regular Join Date: Jan 2006 Location: ATL GA Posts: 186 iTrader: 0 reviews	what does it idle at, 600-800 rpms? u can bring it higher if its too low. have u checked all ur vac lines, cleaned maf, etc.

August 20th, 2006, 10:09 AM	#5
rocket Regular 1990 Mustang GT Join Date: Aug 2006 Location: Ankeny, IA Posts: 88 iTrader: 0 reviews	well, it doesn't idle low, it just drops the rpms/volts then it bounces back up, and it does this over and over usually until I turn the a/c off. it doesn't cont. idle low. sometimes it bounces so low that it dies. could it be electical or some sensor?

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