whenever i start my car it shuts off :(((

joohnn98 · August 29th, 2009, 09:10 PM

whenever i turn my car on it shuts off almost immediately unless i rev my engine then the car will stay on as long as im revving my engine. what are some of the problems that could be causing this?

cruizer · August 29th, 2009, 09:56 PM

sounds like it could be a vacuum leak but that's just a guess

cpork · August 29th, 2009, 11:18 PM

+1 vacuum leak, or an unplugged sensor. You have a stock intake?

Roushredcobra98 · August 30th, 2009, 12:51 PM

Unplug the IAC valve. If it stays running, but high idle, it could be a couple of things. One the IAC valve is bad, or the ECT sensor is bad confusing the computer that the vehicle is at operating temp (while the engine is cold) and it's shutting down.

sharkbait · August 31st, 2009, 02:43 PM

dumb awnser but il put it out there....

Theres a screw that allows you to set were the throttles body vaulve thing sits when your not on the gas...Open it up some so you dont have to put your foot on the pedal

Also check for vacum leaks and fluid leaks.. Check your fluilds...do a diagnostic....

MustangMatt96GT · August 31st, 2009, 11:08 PM

Originally Posted by sharkbait

dumb awnser but il put it out there....

Theres a screw that allows you to set were the throttles body vaulve thing sits when your not on the gas...Open it up some so you dont have to put your foot on the pedal

Also check for vacum leaks and fluid leaks.. Check your fluilds...do a diagnostic....

DO NOT MESS WITH THAT SCREW!!!

that will cause more issues... they are meant to not be touched at all and all the idle speed and everything is put in the tune...

sounds to me like a BIG vaccumm leak... did it just happen one day, or slowly start?

jasons_98gt · September 5th, 2009, 12:11 PM

+1 dont mess with that screw!
check your spark plugs, there was a similar problem with my buddies dodge truck. it would fire right up but die unless he held the gas pedal and his plugs were shot.
hope this helps

Boostang · September 5th, 2009, 04:09 PM

the only vaccum leak thatll make it do this is the one connected to the back of the plenum.. any other vaccum leak will just make your car skip.. so its not a vac leak..

Thumbie · September 6th, 2009, 04:03 AM

your IAC is blocked/not opening. are you getting a CEL?

August 29th, 2009, 09:10 PM	#1
joohnn98 Newbie Join Date: Feb 2009 Posts: 38 iTrader: 0 reviews	whenever i start my car it shuts off :((( whenever i turn my car on it shuts off almost immediately unless i rev my engine then the car will stay on as long as im revving my engine. what are some of the problems that could be causing this? __________________ "I'm shroomin' hella hard right now Mr. Roberts"

August 31st, 2009, 02:43 PM	#5
sharkbait Hooo Ha Ha 1997 Mustang GT 11.99 @ 113.9mph Join Date: Apr 2009 Location: Pasadena MD Posts: 9,632 iTrader: 9 reviews	dumb awnser but il put it out there.... Theres a screw that allows you to set were the throttles body vaulve thing sits when your not on the gas...Open it up some so you dont have to put your foot on the pedal Also check for vacum leaks and fluid leaks.. Check your fluilds...do a diagnostic.... __________________ 374rwhp 456rwtq @ 8psi

September 6th, 2009, 04:03 AM	#9
Thumbie Hardcore Enthusiast 2001 Cobra 14.2@102 (I suck) Join Date: Apr 2009 Location: SF Bay Area, CA Posts: 1,621 iTrader: 0 reviews	your IAC is blocked/not opening. are you getting a CEL? __________________ 2001 Cobra with SRA swap, modded for twisties MM Cobra Club Member #76

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August 29th, 2009, 09:56 PM	#2
cruizer Regular 1998 Mustang GT 13.046@107.49 Join Date: Jul 2008 Location: Lapeer and Detroit, Michigan Posts: 417 iTrader: 0 reviews	sounds like it could be a vacuum leak but that's just a guess

August 29th, 2009, 11:18 PM	#3
cpork Newbie 1997 Mustang GT Join Date: Jan 2007 Location: Fort Hood, TX Posts: 22 iTrader: 0 reviews	+1 vacuum leak, or an unplugged sensor. You have a stock intake?

August 30th, 2009, 12:51 PM	#4
Roushredcobra98 Newbie Join Date: Aug 2009 Posts: 6 iTrader: 0 reviews	Unplug the IAC valve. If it stays running, but high idle, it could be a couple of things. One the IAC valve is bad, or the ECT sensor is bad confusing the computer that the vehicle is at operating temp (while the engine is cold) and it's shutting down.

September 5th, 2009, 12:11 PM	#7
jasons_98gt Enthusiast 1998 mustang GT Join Date: Jul 2007 Location: Pittsburgh PA Posts: 834 iTrader: 0 reviews	+1 dont mess with that screw! check your spark plugs, there was a similar problem with my buddies dodge truck. it would fire right up but die unless he held the gas pedal and his plugs were shot. hope this helps

September 5th, 2009, 04:09 PM	#8
Boostang Hardcore Enthusiast 1997 Mustang GT 11.01@128.32 Join Date: Jan 2009 Location: Seale, Alabama Posts: 1,748 iTrader: 0 reviews	the only vaccum leak thatll make it do this is the one connected to the back of the plenum.. any other vaccum leak will just make your car skip.. so its not a vac leak..

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