Rough Idle

AnFking6908 · May 12th, 2008, 12:26 PM

well i just had to replace my Coil pack, sparkplugs & wires. but my car still has a rough idle.... check engine light is not coming on and it runs smooth under load... could it be the IAC valve? or maybe a vacumme leak?

C MY 4D · May 12th, 2008, 12:27 PM

Could be the IAC or a vacuum leak could be an exhaust leak..... Can you datalog the car? Check your fuel trims.

04DSGV6 · May 12th, 2008, 12:39 PM

run a can of seafoam through it, clean the MAF and IAC and go from there. All those are cheap to do and help eliminate and narrow it down a bit. From there check vacuum lines

C MY 4D · May 12th, 2008, 12:47 PM

Originally Posted by 04DSGV6

run a can of seafoam through it, clean the MAF and IAC and go from there. All those are cheap to do and help eliminate and narrow it down a bit. From there check vacuum lines

Oh I forgot the magical seafoam will fix everything..... It'll give you 50 RWHP too. if you think it may be the IAC which won't cause a rough idle it will cause a random idle spray it with a shot of wd40. I am going to guess it has a faint exhaust leak throwing the fuel trims way off. I see it on just about every mustang that has an aftermarket mid-pipe or has bottomed out on a few speed bumps.

AnFking6908 · May 12th, 2008, 05:13 PM

it does have an exhaust leak in the muffler and in the manifold on the driver side

04mustang232 · May 12th, 2008, 10:31 PM

seafoam is magical. maybe someone stole your car for a night and put a cam in it.

C MY 4D · May 13th, 2008, 09:38 AM

Originally Posted by AnFking6908

it does have an exhaust leak in the muffler and in the manifold on the driver side

there you go... fix the leak and reset the adaptives.

May 12th, 2008, 12:26 PM	#1
AnFking6908 Regular 2001 Mustang V6 ??? Join Date: Mar 2008 Location: Houston Posts: 68 iTrader: 0 reviews	Rough Idle well i just had to replace my Coil pack, sparkplugs & wires. but my car still has a rough idle.... check engine light is not coming on and it runs smooth under load... could it be the IAC valve? or maybe a vacumme leak?

May 12th, 2008, 12:27 PM	#2
C MY 4D Billy Weston 2003 Cobra 11.14@124.36 Join Date: Aug 2006 Location: Hampton, VA Posts: 4,806 iTrader: 8 reviews	Could be the IAC or a vacuum leak could be an exhaust leak..... Can you datalog the car? Check your fuel trims. __________________ TT Build in progress....... Need work done to your car for a great price in Hampton Roads? Shoot me a PM.

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May 12th, 2008, 12:39 PM	#3
04DSGV6 Enthusiast 2004 Mustang V6 Join Date: Oct 2007 Location: Chicago,IL Posts: 546 iTrader: 1 reviews	run a can of seafoam through it, clean the MAF and IAC and go from there. All those are cheap to do and help eliminate and narrow it down a bit. From there check vacuum lines

May 12th, 2008, 05:13 PM	#5
AnFking6908 Regular 2001 Mustang V6 ??? Join Date: Mar 2008 Location: Houston Posts: 68 iTrader: 0 reviews	it does have an exhaust leak in the muffler and in the manifold on the driver side

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