Car Won't Idle

Vamp89 · April 25th, 2009, 12:37 AM

Been awhile guys but I'm having issues with my car, it runs but won't idle and dumps fuel like crazy no matter what we do. Changed every sensor went through 3 different mass air meters and injectors changed computers and engine wiring harness but not the dash/firewall harness yet. Can anyone help with this I don't wanna carb it but it is looking that way. Thanks

Chris951 · April 25th, 2009, 12:48 AM

Did you check fuel pressure?

Vamp89 · April 25th, 2009, 12:56 AM

Set right now at 42 running 24# injectors

93hatch · April 25th, 2009, 01:29 AM

try 38

Chris951 · April 25th, 2009, 01:41 AM

42 seems a little high..

93hatch · April 25th, 2009, 02:22 AM

how do you know its dumping fuel like crazy?

nolife · April 25th, 2009, 09:43 AM

You sig says 30 injectors and now you have 24? Did you swap or recall the MAF sensor to match the 24 injectors?
Check you FPR vac line and see if fuel is leaking by.

Vamp89 · April 25th, 2009, 09:46 AM

Yeah we switched injectors and mass airs and you can smell the gas when its trying to idle

Vamp89 · April 25th, 2009, 10:00 AM

We ran the 24s at 36 and it was to lean so we went to 42 , it runs great but when it hunts for that idle it's screwed

Vamp89 · April 25th, 2009, 11:40 AM

Disconnected MSD box put stock coil back on idling at 900 :-)

1slo5.0 · April 25th, 2009, 12:03 PM

Originally Posted by Vamp89

Been awhile guys but I'm having issues with my car, it runs but won't idle and dumps fuel like crazy no matter what we do. Changed every sensor went through 3 different mass air meters and injectors changed computers and engine wiring harness but not the dash/firewall harness yet. Can anyone help with this I don't wanna carb it but it is looking that way. Thanks

Step number one is always scan for codes even if there is no check engine light on. As you found out the hard way, throwing random parts and sensors at a problem never works and is usually very costly. A carburetor is never the answer either. What will you do when the car runs like shit after you put a carb on? Switch back to EFI?

Originally Posted by Vamp89

We ran the 24s at 36 and it was to lean so we went to 42 , it runs great but when it hunts for that idle it's screwed

No it wasn't lean at 36lbs. I would like to know why you think that. I can tell you that 42lbs is high though.

Originally Posted by Vamp89

Disconnected MSD box put stock coil back on idling at 900 :-)

Let me guess, the MSD box was mounted under the hood in the engine compartment?

April 25th, 2009, 12:37 AM	#1
Vamp89 Regular 1989 Mustang GT Join Date: May 2006 Location: Indiana Posts: 194 iTrader: 0 reviews	Car Won't Idle Been awhile guys but I'm having issues with my car, it runs but won't idle and dumps fuel like crazy no matter what we do. Changed every sensor went through 3 different mass air meters and injectors changed computers and engine wiring harness but not the dash/firewall harness yet. Can anyone help with this I don't wanna carb it but it is looking that way. Thanks __________________ 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

April 25th, 2009, 12:56 AM	#3
Vamp89 Regular 1989 Mustang GT Join Date: May 2006 Location: Indiana Posts: 194 iTrader: 0 reviews	Set right now at 42 running 24# injectors __________________ 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

April 25th, 2009, 01:29 AM	#4
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	try 38 __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

April 25th, 2009, 02:22 AM	#6
93hatch Banned 1992 Lx 11.39@119.24 Join Date: Jan 2008 Location: Az Posts: 11,644 iTrader: 0 reviews	how do you know its dumping fuel like crazy? __________________ [QUOTE=93mustank;2577445]We speed tested my right arm for quickness in shifts... So he could design the cam for proper shift recovery.[/QUOTE]

April 25th, 2009, 09:43 AM	#7
nolife MM Fanatic 91GT, 88GT, 02GT Join Date: Dec 2006 Posts: 3,057 Blog Entries: 3 iTrader: 0 reviews	You sig says 30 injectors and now you have 24? Did you swap or recall the MAF sensor to match the 24 injectors? Check you FPR vac line and see if fuel is leaking by. __________________

April 25th, 2009, 12:48 AM	#2
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	Did you check fuel pressure?

April 25th, 2009, 01:41 AM	#5
Chris951 Hardcore Enthusiast 1991 mustang 5.0 Join Date: Aug 2007 Location: Mesa, AZ Posts: 1,938 iTrader: 0 reviews	42 seems a little high..

April 25th, 2009, 09:46 AM	#8
Vamp89 Regular 1989 Mustang GT Join Date: May 2006 Location: Indiana Posts: 194 iTrader: 0 reviews	Yeah we switched injectors and mass airs and you can smell the gas when its trying to idle __________________ 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

April 25th, 2009, 10:00 AM	#9
Vamp89 Regular 1989 Mustang GT Join Date: May 2006 Location: Indiana Posts: 194 iTrader: 0 reviews	We ran the 24s at 36 and it was to lean so we went to 42 , it runs great but when it hunts for that idle it's screwed __________________ 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

April 25th, 2009, 11:40 AM	#10
Vamp89 Regular 1989 Mustang GT Join Date: May 2006 Location: Indiana Posts: 194 iTrader: 0 reviews	Disconnected MSD box put stock coil back on idling at 900 :-) __________________ 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

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