Rough idle after installing CAI

a_kraker99 · December 6th, 2008, 12:22 AM

So I installed my ebay fenderwell intake CAI last night and it seems to be having a rough idle in drive. I disconnected the battery so the PCM could relearn it. I have reset it once before and didn't have a rough idle that time so I dont think it is a learning issue. I have heard that the MAF sensor can have some bad readings because fo the 90 degree bend before the sensor. Is there any way to correct this or am I experiencing a different problem? I put the metal screen back in to try and help it but it didnt do anything.
The idle seems fine when in park and it drives fine but the idle in drive is really rough.

riddlee josh · December 6th, 2008, 12:24 AM

prolly vacuum leak. just look for leaks real close

mustangjeff1997 · December 6th, 2008, 12:33 AM

+1

a_kraker99 · December 6th, 2008, 12:36 AM

It wasnt doing it before the install though and there ddint seem to be any vacuum lines around the intake area.

itschristorres8 · December 6th, 2008, 01:11 AM

you will not have a vacuum leak installing the intake unless you did something wrong
you intake has no vacuum ports to the intake on a 99+
even single ports i dont believe have vacuum ports
is your MAF plugged in?

a_kraker99 · December 6th, 2008, 10:12 AM

yup its plugged it. Not throwing any codes.

slvr2000stang · December 6th, 2008, 11:03 AM

Check the couplings after the MAF to make sure they are sealed correctly.
A bad connection after the MAF would allow un metered air in and the symptoms you have.

dgt_mustang · December 6th, 2008, 12:25 PM

Clean your MAF sensor, sometimes when people disassemble it, you put your MAF sensor somewhere where grime or dust from being out in the open can clog that up. Even if it looks clean. still clean it

a_kraker99 · December 6th, 2008, 12:56 PM

Originally Posted by slvr2000stang

Check the couplings after the MAF to make sure they are sealed correctly.
A bad connection after the MAF would allow un metered air in and the symptoms you have.

They are sealed pretty good IMO. I might just take it apart and put it back together. It was like 20 degrees, dark and snowing when I installed it so I may have fudged it somewhere. I did clean the MAF with some MAF cleaner right before I installed it so that shouldnt be an issue. It seems like it might be getting better after driving it the last time but I cant take it out because we got like 7 inches of snow here last night and another foot is expected tonight.

a_kraker99 · December 6th, 2008, 08:04 PM

Well I took it apart and reinstalled it with a metal honeycomb grid in the pipe before the MAF. I had an extra one from my photography business. I didnt get to drive it at all but I sat in the driveway and the idle seemed a little better in drive but it might be just wishful thinking. Hopefully all this junk I am putting in the tube isnt too restictive. Its definately not as smooth as it was with the stock intake at this point.

GreenFaleen · December 6th, 2008, 09:43 PM

hard reset the engine just isnt used to the increase in air

a_kraker99 · December 7th, 2008, 12:54 AM

Originally Posted by GreenFaleen

hard reset the engine just isnt used to the increase in air

Are you talking about just resetting the PCM by unhooking the battery? I have done that already. Or are you talking about something else? How long should it take to relearn the new intake?

GreenFaleen · December 7th, 2008, 12:57 AM

its different take off your negative terminal and touch it to the positive

YouTube - Hard reset wont kill car

like in the vid

a_kraker99 · December 7th, 2008, 01:02 AM

What does that do different from just taking off the negative cable? I will have to give it a shot.

GreenFaleen · December 7th, 2008, 01:04 AM

it resets the ECU back to factory settings meaning it forget your driving style now and relearns everything. itll feel funny at first but give in about 75-115 miles and itll feel right again

a_kraker99 · December 7th, 2008, 01:09 AM

I couldnt see the video very well. Do I need to disconnect both battery cables and touch them together or just touch the ground to the positive while the positive is still connected?

GreenFaleen · December 7th, 2008, 01:10 AM

take off the negative and while the positive is still connected touch the negative to it

a_kraker99 · December 7th, 2008, 01:14 AM

Thanks, I will give that a try. What gets reset when you just disconnect the negative cable for a while?

GreenFaleen · December 7th, 2008, 12:48 PM

disconnect the negative just resets the OBD 2 cycle and electronic things. the hard reset resets the ECU which is essentially flash memory that stores things like injector response ect to adapt to how you drive

a_kraker99 · December 7th, 2008, 12:51 PM

gotcha, maybe I should take out all the junk I put in there to straighten the air out before I reset it. Do you think I should keep the screen in?

December 6th, 2008, 12:22 AM	#1
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 177 iTrader: 0 reviews	Rough idle after installing CAI So I installed my ebay fenderwell intake CAI last night and it seems to be having a rough idle in drive. I disconnected the battery so the PCM could relearn it. I have reset it once before and didn't have a rough idle that time so I dont think it is a learning issue. I have heard that the MAF sensor can have some bad readings because fo the 90 degree bend before the sensor. Is there any way to correct this or am I experiencing a different problem? I put the metal screen back in to try and help it but it didnt do anything. The idle seems fine when in park and it drives fine but the idle in drive is really rough.

December 6th, 2008, 12:24 AM	#2
riddlee josh Enthusiast 1998 mustang 3.8l v6 Join Date: Nov 2007 Location: portsmouth ohio Posts: 811 iTrader: 0 reviews	prolly vacuum leak. just look for leaks real close __________________ RACING because baseball,basketball, bowling,football, and golf only require one ball

December 6th, 2008, 01:11 AM	#5
itschristorres8 Banned 00 V6 & 09 GT 13.37@104.4mph--BONE stock GT Join Date: Aug 2006 Location: south florida Posts: 15,859 iTrader: 2 reviews	you will not have a vacuum leak installing the intake unless you did something wrong you intake has no vacuum ports to the intake on a 99+ even single ports i dont believe have vacuum ports is your MAF plugged in? __________________ [SIGPIC][/SIGPIC] Acmillr loves me

December 6th, 2008, 11:03 AM	#7
slvr2000stang Regular 2000 Mustang 14.10@96.75 Join Date: Apr 2007 Location: Chicago Posts: 54 iTrader: 0 reviews	Check the couplings after the MAF to make sure they are sealed correctly. A bad connection after the MAF would allow un metered air in and the symptoms you have. __________________ 2000 V6 vert 2003 Lightning

December 6th, 2008, 12:25 PM	#8
dgt_mustang The soul stealing Ginger 2001 Mustang 3.8l Join Date: Jun 2007 Location: Charleston, SC Posts: 3,102 iTrader: 0 reviews	Clean your MAF sensor, sometimes when people disassemble it, you put your MAF sensor somewhere where grime or dust from being out in the open can clog that up. Even if it looks clean. still clean it __________________ Cosmetic: Vent-visors, Pioneer Bluetooth Radio Deck, 17" Cobra Alloy Rims, HID 4500k 55watt setup, Chrome Headlamps 15% Tint, Red sway bar Performance: CAI,Mac-Longtubes, H-pipe, Flow 40s, NO CATS Diablo Tuner, Rear Sway bar

December 6th, 2008, 12:36 AM	#4
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 177 iTrader: 0 reviews	It wasnt doing it before the install though and there ddint seem to be any vacuum lines around the intake area.

December 6th, 2008, 10:12 AM	#6
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 177 iTrader: 0 reviews	yup its plugged it. Not throwing any codes.

December 6th, 2008, 08:04 PM	#10
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 177 iTrader: 0 reviews	Well I took it apart and reinstalled it with a metal honeycomb grid in the pipe before the MAF. I had an extra one from my photography business. I didnt get to drive it at all but I sat in the driveway and the idle seemed a little better in drive but it might be just wishful thinking. Hopefully all this junk I am putting in the tube isnt too restictive. Its definately not as smooth as it was with the stock intake at this point.

December 6th, 2008, 09:43 PM	#11
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,906 Blog Entries: 2 iTrader: 1 reviews	hard reset the engine just isnt used to the increase in air __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

December 7th, 2008, 01:02 AM	#14
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 177 iTrader: 0 reviews	What does that do different from just taking off the negative cable? I will have to give it a shot.

December 7th, 2008, 01:04 AM	#15
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,906 Blog Entries: 2 iTrader: 1 reviews	it resets the ECU back to factory settings meaning it forget your driving style now and relearns everything. itll feel funny at first but give in about 75-115 miles and itll feel right again __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

December 7th, 2008, 01:09 AM	#16
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 177 iTrader: 0 reviews	I couldnt see the video very well. Do I need to disconnect both battery cables and touch them together or just touch the ground to the positive while the positive is still connected?

December 7th, 2008, 01:10 AM	#17
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,906 Blog Entries: 2 iTrader: 1 reviews	take off the negative and while the positive is still connected touch the negative to it __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

December 7th, 2008, 01:14 AM	#18
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 177 iTrader: 0 reviews	Thanks, I will give that a try. What gets reset when you just disconnect the negative cable for a while?

December 7th, 2008, 12:48 PM	#19
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,906 Blog Entries: 2 iTrader: 1 reviews	disconnect the negative just resets the OBD 2 cycle and electronic things. the hard reset resets the ECU which is essentially flash memory that stores things like injector response ect to adapt to how you drive __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

December 7th, 2008, 12:51 PM	#20
a_kraker99 Regular 2003 Mustang V6 Join Date: Nov 2008 Location: Zeeland, Michigan Posts: 177 iTrader: 0 reviews	gotcha, maybe I should take out all the junk I put in there to straighten the air out before I reset it. Do you think I should keep the screen in?

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