need help with idling problem

orson250 · July 14th, 2009, 04:52 PM

hello people, shortly after installing the vortech, the car will idle really low and eventually die on me all the time. i was having to like put it in neutral and give it a little gas to keep it from dying. the guy who did the dyno said that i needed new spark plugs so i got the ngk plugs he told me plus new plug wires.

so far the things we have tried include: fixing all vacuum leaks, reseting the tps sensor, replacing the iac valve, and readjusting idle set screw. the idle is better but will still die if it sits running a few minutes.

a few things my dad was thinking about trying: cleaning the throttle body and rechecking the idle set screw. is there anything that you guys can think of as to why the idle is so off?

orson250 · July 14th, 2009, 08:52 PM

bump. does nobody have any suggestions? i have to have it running excellent by the middle of august

SinisterStang · July 15th, 2009, 02:19 AM

Hmm, i would try to run some seafoam see if it helps any.

WLJohnson05 · July 15th, 2009, 02:38 AM

clean the maf

stephen · July 15th, 2009, 02:45 PM

I'm assuming a vortech is a supercharger, since you say you are running 7 psi.

If the air coming in is at 7 psi it is denser than if it were not turbocharged by a factor of about 1.5. I presume you need more fuel to compensate for the denser air. I don't think the MAF can compensate for that, though the oxygen sensors should compensate, and it may need to have some tuning adjustments made.

stephen · July 15th, 2009, 04:28 PM

A bit more information. According to the following link, the MAF does respond to air density as well as flow rate, so it should properly measure the amount of air into the engine, and combined with the oxygen sensor should be able to control the mixture.

Mass flow sensor - Wikipedia, the free encyclopedia

Hopefully, someone with actual experience with this issue will respond.

orson250 · July 15th, 2009, 06:19 PM

we found some minor vacuum leaks after the dyno tuning session and it is seeming that the tune is sending in more fuel to compensate for the leaks that are now fixed so could that little bit of extra fuel lead to idling problems? we have not cleaned the maf sensor, but the install wasn't very long ago and it didn't look bad when we took it out.

04mustang232 · July 15th, 2009, 06:22 PM

Originally Posted by WLJohnson05

clean the maf

yeah, and the entire throttle body and iac.

How many miles are on your car?

orson250 · July 15th, 2009, 06:29 PM

Originally Posted by 04mustang232

yeah, and the entire throttle body and iac.

How many miles are on your car?

cleaned the throttle body and iac. i have 59,000 mi

2002 BLK GT · July 15th, 2009, 08:47 PM

Check for exhaust leaks,ECU, O2 Sensors, fuel injectors, other sensors, EGR, cam sensor, engine compression, etc...

July 14th, 2009, 04:52 PM	#1
orson250 Regular 2003 mustang v6 232rwhp@7psi Join Date: Jul 2007 Location: jackson, MS Posts: 244 iTrader: 0 reviews	need help with idling problem hello people, shortly after installing the vortech, the car will idle really low and eventually die on me all the time. i was having to like put it in neutral and give it a little gas to keep it from dying. the guy who did the dyno said that i needed new spark plugs so i got the ngk plugs he told me plus new plug wires. so far the things we have tried include: fixing all vacuum leaks, reseting the tps sensor, replacing the iac valve, and readjusting idle set screw. the idle is better but will still die if it sits running a few minutes. a few things my dad was thinking about trying: cleaning the throttle body and rechecking the idle set screw. is there anything that you guys can think of as to why the idle is so off? __________________ V0rTech'D

July 14th, 2009, 08:52 PM	#2
orson250 Regular 2003 mustang v6 232rwhp@7psi Join Date: Jul 2007 Location: jackson, MS Posts: 244 iTrader: 0 reviews	bump. does nobody have any suggestions? i have to have it running excellent by the middle of august __________________ V0rTech'D

July 15th, 2009, 02:38 AM	#4
WLJohnson05 MM's Database Error 2004 Mustang V6 322.8 rwhp Join Date: Mar 2007 Location: VA Posts: 13,285 iTrader: 9 reviews	clean the maf __________________ I'm trying to get rid of this stuff, feel free to make me an offer!: SCT Mass Air Flow Sensor $200 Tial Wastegate Springs $40 (10psi and 3.6psi)

July 15th, 2009, 06:19 PM	#7
orson250 Regular 2003 mustang v6 232rwhp@7psi Join Date: Jul 2007 Location: jackson, MS Posts: 244 iTrader: 0 reviews	we found some minor vacuum leaks after the dyno tuning session and it is seeming that the tune is sending in more fuel to compensate for the leaks that are now fixed so could that little bit of extra fuel lead to idling problems? we have not cleaned the maf sensor, but the install wasn't very long ago and it didn't look bad when we took it out. __________________ V0rTech'D

July 15th, 2009, 08:47 PM	#10
2002 BLK GT Hardcore Enthusiast 03 Mach 1 & 02 GT *************** Join Date: Apr 2009 Location: S. California Posts: 2,178 iTrader: 0 reviews	Check for exhaust leaks,ECU, O2 Sensors, fuel injectors, other sensors, EGR, cam sensor, engine compression, etc... __________________ 2003 Mach 1 Procharged 500rwhp club

July 15th, 2009, 02:19 AM	#3
SinisterStang Regular 2000 Mustang/P71 CrownVic N/A Join Date: Jan 2009 Location: Long Beach, Ca Posts: 148 iTrader: 0 reviews	Hmm, i would try to run some seafoam see if it helps any.

July 15th, 2009, 02:45 PM	#5
stephen Hardcore Enthusiast Join Date: Feb 2007 Posts: 1,262 iTrader: 0 reviews	I'm assuming a vortech is a supercharger, since you say you are running 7 psi. If the air coming in is at 7 psi it is denser than if it were not turbocharged by a factor of about 1.5. I presume you need more fuel to compensate for the denser air. I don't think the MAF can compensate for that, though the oxygen sensors should compensate, and it may need to have some tuning adjustments made.

July 15th, 2009, 04:28 PM	#6
stephen Hardcore Enthusiast Join Date: Feb 2007 Posts: 1,262 iTrader: 0 reviews	A bit more information. According to the following link, the MAF does respond to air density as well as flow rate, so it should properly measure the amount of air into the engine, and combined with the oxygen sensor should be able to control the mixture. Mass flow sensor - Wikipedia, the free encyclopedia Hopefully, someone with actual experience with this issue will respond.

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