the dreaded check engine light :[

Gedfar · 03-30-2008, 11:06 AM

I just got my X pipe and catback exaust put on yesterday, (both are SLP) and this morning on the way to church, my check engine light came on.... any ideas. like a sensor or something??

Stan · 03-30-2008, 11:21 AM

get some Mil eliminators

TUFF 4.6 · 03-30-2008, 01:15 PM

Is it a catted or offroad X pipe? If its an offroad x pipe then do what Stan said. These have to go inline with back O2 senors. They tell the ECM that all is lovely.

redfire04 · 03-30-2008, 07:24 PM

In his sig it says catted x pipe. The cel could still trip even with the catted x pipe. I'd say get a handheld programmer especially if you plan on modding your car more.

Gedfar · 03-30-2008, 07:48 PM

I'm gonna have the shop double check the sensors and such, but the programmer probobly wouldn't hurt... I need paychecks =[ lol

Gedfar · 03-31-2008, 07:08 PM

what would the chip / tuner change to fix the problem, cause the motor is also running really rich...

redfire04 · 03-31-2008, 08:34 PM

With the tuner you could turn off the rear o2 sensors which come on usually after installing an o/r mid pipe...but an aftermarket catted midpipe can trip the cel. The mil eliminators would do the same thing the tuner would but that's it. With the tuner you get a performance tune right out of the box and the opportunity to get a custom tune at a local shop. Not to mention you can read cel codes and fix speedo changes if you add gears etc.

Get the tuner and a custom tune at a local shop. That way you can have piece of mind and better performance all in one.

r3dn3ck · 04-01-2008, 09:41 AM

disable rear sensors in the tune and the problem usually goes away.

Gedfar · 04-01-2008, 07:11 PM

well this was easy... I just disconnected the Negative battery terminal for 30 minutes, and reconnected it, then let the car idle for about 15... it idled really really wierd for about 5 minutes then the computer reset and it not only idles like it should, it's running better than I could have ever amigined. and to top it all off... the light is gone!!!! =] =] =]

redfire04 · 04-01-2008, 09:04 PM

The light may still come back...

jbullitt2005 · 04-02-2008, 05:42 AM

In the 99-04 mustangs when you disconect the battery it does clear the CEL but it takes your computer like something crazy around 30 starts or something close to read your car and if it is a problem it will come back on, plus with a different midpipe it may be running to rich/lean on the left or right bank and thats as simple as adjusting it with a tuner.

03-30-2008, 11:06 AM	#1 (permalink)
Gedfar Junior Member Join Date: Feb 2008 Location: Marietta GA A.K.A. ATL Posts: 20	the dreaded check engine light :[ I just got my X pipe and catback exaust put on yesterday, (both are SLP) and this morning on the way to church, my check engine light came on.... any ideas. like a sensor or something?? __________________ 98` SVT cobra Steeda underdrive pully - Steeda tri-ax short shifter - C&L C/A intake. SLP loudmouth II - SLP Catted X-pipe.

03-30-2008, 11:21 AM	#2 (permalink)
Stan Beantown Stang Join Date: Dec 2005 Location: Boston, MA Posts: 1,291	get some Mil eliminators __________________ 2002 Black Mustang GT 5 speed Mods BORLA Stingers SLP Catted-X MGW Shifter Mach 1 Grill Delete/Chin Spoiler Chrome 03 Cobra's 17x9 H&R Supersports Waiting to install Vortech Supercharger 4.10's FOR SALE!! SLP LM1 Catback, Magnaflow O/R X PM ME!

03-30-2008, 01:15 PM	#3 (permalink)
TUFF 4.6 Senior Citizen Join Date: Dec 2007 Location: Richmond Va. Posts: 512	Is it a catted or offroad X pipe? If its an offroad x pipe then do what Stan said. These have to go inline with back O2 senors. They tell the ECM that all is lovely. __________________

03-30-2008, 07:24 PM	#4 (permalink)
redfire04 Redfire GT Join Date: Mar 2005 Location: St. Louis Posts: 419	In his sig it says catted x pipe. The cel could still trip even with the catted x pipe. I'd say get a handheld programmer especially if you plan on modding your car more. __________________ 2004 Redfire GT BBK Longtubes BBK O/R X-Pipe Magnaflow cat back Steeda Sport Springs Tokico HPs Black Bullitts Mach 1 Grill Delete Mach 1 Chin Spoiler Mach 1 Rear Wing Honeycomb Trim Panel Blackout Tails Awaiting Install: FRPP 4.10s - Trick Flow Diff Cover

03-30-2008, 07:48 PM	#5 (permalink)
Gedfar Junior Member Join Date: Feb 2008 Location: Marietta GA A.K.A. ATL Posts: 20	I'm gonna have the shop double check the sensors and such, but the programmer probobly wouldn't hurt... I need paychecks =[ lol __________________ 98` SVT cobra Steeda underdrive pully - Steeda tri-ax short shifter - C&L C/A intake. SLP loudmouth II - SLP Catted X-pipe.

03-31-2008, 07:08 PM	#6 (permalink)
Gedfar Junior Member Join Date: Feb 2008 Location: Marietta GA A.K.A. ATL Posts: 20	what would the chip / tuner change to fix the problem, cause the motor is also running really rich... __________________ 98` SVT cobra Steeda underdrive pully - Steeda tri-ax short shifter - C&L C/A intake. SLP loudmouth II - SLP Catted X-pipe.

03-31-2008, 08:34 PM	#7 (permalink)
redfire04 Redfire GT Join Date: Mar 2005 Location: St. Louis Posts: 419	With the tuner you could turn off the rear o2 sensors which come on usually after installing an o/r mid pipe...but an aftermarket catted midpipe can trip the cel. The mil eliminators would do the same thing the tuner would but that's it. With the tuner you get a performance tune right out of the box and the opportunity to get a custom tune at a local shop. Not to mention you can read cel codes and fix speedo changes if you add gears etc. Get the tuner and a custom tune at a local shop. That way you can have piece of mind and better performance all in one. __________________ 2004 Redfire GT BBK Longtubes BBK O/R X-Pipe Magnaflow cat back Steeda Sport Springs Tokico HPs Black Bullitts Mach 1 Grill Delete Mach 1 Chin Spoiler Mach 1 Rear Wing Honeycomb Trim Panel Blackout Tails Awaiting Install: FRPP 4.10s - Trick Flow Diff Cover

04-01-2008, 09:41 AM	#8 (permalink)
r3dn3ck Wowbagger hates me too! Join Date: Nov 2005 Location: Magrathea/California Posts: 6,693	disable rear sensors in the tune and the problem usually goes away. __________________ Built 5.5L 2v and Maximum Motorsports Max Grip box. www.squarerootofone.com My CarDomain Page

04-01-2008, 07:11 PM	#9 (permalink)
Gedfar Junior Member Join Date: Feb 2008 Location: Marietta GA A.K.A. ATL Posts: 20	well this was easy... I just disconnected the Negative battery terminal for 30 minutes, and reconnected it, then let the car idle for about 15... it idled really really wierd for about 5 minutes then the computer reset and it not only idles like it should, it's running better than I could have ever amigined. and to top it all off... the light is gone!!!! =] =] =] __________________ 98` SVT cobra Steeda underdrive pully - Steeda tri-ax short shifter - C&L C/A intake. SLP loudmouth II - SLP Catted X-pipe.

04-01-2008, 09:04 PM	#10 (permalink)
redfire04 Redfire GT Join Date: Mar 2005 Location: St. Louis Posts: 419	The light may still come back... __________________ 2004 Redfire GT BBK Longtubes BBK O/R X-Pipe Magnaflow cat back Steeda Sport Springs Tokico HPs Black Bullitts Mach 1 Grill Delete Mach 1 Chin Spoiler Mach 1 Rear Wing Honeycomb Trim Panel Blackout Tails Awaiting Install: FRPP 4.10s - Trick Flow Diff Cover

04-02-2008, 05:42 AM	#11 (permalink)
jbullitt2005 jbullitt2005 Join Date: Feb 2008 Location: From Aurora Mo, but stationed in Washington D.C. Posts: 6	In the 99-04 mustangs when you disconect the battery it does clear the CEL but it takes your computer like something crazy around 30 starts or something close to read your car and if it is a problem it will come back on, plus with a different midpipe it may be running to rich/lean on the left or right bank and thats as simple as adjusting it with a tuner. __________________ 2001 Bullitt bbk longtubes,bbk off road x, mac flow path cat back,underdrive pullies,cai,bbk tb,comp xtreme energy cam,tubular front end,4.10's, 31 spline stuff, spec stage 3, sct 4 bank chip, dyno tune by excessive motorsports, kb soon to come Never underestimate a 2v car

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