Why did this happen?

d98gt

Founding Member

Mar 14, 2002

4,505

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204

SE Texas

Nov 30, 2006

#1

• Nov 30, 2006

• #1

I had my stock midpipe taken off due to it having 6 cats, which is totally uncalled for

I put on a pipe which has two cats, after a few bad words due to the passenger side where the pipe connects to the manifolds, one of those bolts is a major PITA

After the install after I drove a few miles I threw a check engine light, which was expected being that I didn't have mil elim. installed. I drove around for probably 3-4 hours with the check engine light on and it wasn't all that bad, however today when driving, I got on it a bit and the check engine light went off. The getting on it and it turning off wasn't probably related, however, why the hell would the CEL go off after 2 days of driving with it on?

 

E

exindust

New Member

May 8, 2004

329

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Moorpark, CA

Nov 30, 2006

#2

• Nov 30, 2006

• #2

did your battery die?

 

d98gt

Founding Member

Mar 14, 2002

4,505

59

204

SE Texas

Nov 30, 2006

#3

• Nov 30, 2006

• #3

Nope, I was just driving home from class today on the way to the shop and when I passed someone the light just turned off. I've drove the car about 35 miles since then and it hasn't returned

 

Dope 97GT

New Member

Jul 16, 2005

439

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Rochester, NY (SUNY Brockport)

Nov 30, 2006

#4

• Nov 30, 2006

• #4

i would say f' it and not complain about NOT HAVING a CEL. I have one and its a major PITA

 

d98gt

Founding Member

Mar 14, 2002

4,505

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204

SE Texas

Nov 30, 2006

#5

• Nov 30, 2006

• #5

I'm not complaining by any means, just curious of why it happened

My luck the damn bulb went out

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,179

17,880

224

Massachusetts

Nov 30, 2006

#6

• Nov 30, 2006

• #6

it will come back eventually

 

T

thomas91169

I'd donkey punch my sister.

Aug 19, 2005

0

0

0

Modesto, CA

Nov 30, 2006

#7

• Nov 30, 2006

• #7

^^^yep

when you got on it the a/f must have dipped into a range that the rear o2 sensors liked seeing, so the ecu got happy thinking you put your cats back and took the code away.

Though it has no effect on performance, the rear o2's job is to make sure the cats are working properly, and is merely a OBDII Emissions related component, not a sensor that can affect fuel/ignition parameters.

 

d98gt

Founding Member

Mar 14, 2002

4,505

59

204

SE Texas

Nov 30, 2006

#8

• Nov 30, 2006

• #8

Yeah, i'll just buy the cheap splice in mils and get it over with. As for the time being, I'll enjoy driving without the annoying bright light

 

COramprat

...I can take it. I think.

20+ Year Stangneter

Mar 2, 2003

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Sea of Tranquility

Nov 30, 2006

#9

• Nov 30, 2006

• #9

d98gt said:

Yeah, i'll just buy the cheap splice in mils and get it over with. As for the time being, I'll enjoy driving without the annoying bright light

Click to expand...

Get a piece of black electrical tape to stick across it if it comes back on before you splice the O2 sims.

 

Dusstbuster

I love meat more than anything! I just have a spec

May 31, 2004

1,462

33

64

Moorhead, Minnesota

Dec 1, 2006

#10

• Dec 1, 2006

• #10

My Hydraulic Control Module for the ABS system in my car is fried so I've had the fortune of staring at the ABS light for 2+ years. Add on the fact that 96's have crappy oil level sensors and like to burn oil AND that it doesn't like the aftermarket intake and there are some weeks where i'll be driving with an ABS, CEL, and LOW OIL light all at once...it is very annoying.

 

CobraRed_96_GT

Active Member

May 20, 2006

1,421

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39

UCSD/La Jolla

Dec 1, 2006

#11

• Dec 1, 2006

• #11

wait u replaced it w/ a pipe that has 2 cats? in this case you still have holes for the two o2 sensors and there shouldnt be a CEL at all. I have an x pipe w/ 2 high flow cats.....never got a CEL
this should be tech

 

CobraRed_96_GT

Active Member

May 20, 2006

1,421

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39

UCSD/La Jolla

Dec 1, 2006

#12

• Dec 1, 2006

• #12

d98gt said:

after a few bad words due to the passenger side where the pipe connects to the manifolds, one of those bolts is a major PITA

Click to expand...

i heare ya, i had to use a 1/4" drive and extension with a 180 swivel before the socket cuz the bolt is so small. Thought i was going to break the extension from torqueing it.

 

D

Dragstr05

New Member

Dec 21, 2004

643

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Stafford VA

Dec 1, 2006

#13

• Dec 1, 2006

• #13

thomas91169 said:

^^^yep

when you got on it the a/f must have dipped into a range that the rear o2 sensors liked seeing, so the ecu got happy thinking you put your cats back and took the code away.

Though it has no effect on performance, the rear o2's job is to make sure the cats are working properly, and is merely a OBDII Emissions related component, not a sensor that can affect fuel/ignition parameters.

Click to expand...

While the rear O2's dont directly control the fuel trims, they can/will affect performance. I was told that running with no MIL's throws the computer into fail safe mode. This info came from a senior master ford tech, who also has a drag mustang. I can speak for this as well, cause as soon as I put my MIL's in, the car deffinately pulls a little harder, especially at higher speeds.

If the CEL went off, dont worry about it. Going WOT will not just all of a sudden turn the CEL off either just because of a richer A/F ratio. WOT is not a drive cycle.

 

M

mustangcam

New Member

Mar 21, 2006

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Pensacola, Florida

Dec 1, 2006

#14

• Dec 1, 2006

• #14

what do you do when the ses light is on? do i take it to the dealer to see what the code is? cuz mine came on after the o/r x-pipe went on and i actually used the mils.

 

d98gt

Founding Member

Mar 14, 2002

4,505

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SE Texas

Dec 2, 2006

#15

• Dec 2, 2006

• #15

Autozone pulls codes for free

btw-the light returned