96 cobra loading up

[Night/MareCobra]

i have a 96 cobra that has been loading up and running rich on fuel since i cut the cats off...it has an x pipe with cats on it until i had them cut off the front o2s were reading rich tried replacing coils and spark plugs still no luck...car runs perfect the 1st time you start it in a day but 2nd time and any after that it loads up just had the car tuned the day before i cut the cats off also and it ran perfect any ideas?

[JIMS SVT]

Bad 02 sensor

[Blackout]

OK, your post is a little confusing.... Did you cut off the cats or the O2's? Hopefully just the cats and if so then with the car running rich doesn't really make sense. If you cut the cats off, the back O2's just will make the car run lean. Basically in the 96-98 GT's and cobra's they run a fuel pressure regulator on top of the fuel rail. Make sure that all you vacuums are hooked up. One of the other things that can make you car run rich is the Mass/Air, make sure its connected and its clean. You can clean it by taking it off and spraying it with some brake parts cleaner.

There may be some other stuff it could be, but this is a place to start. Good Luck and I hoped I helped.

[700hp04mystic]

not sure on this but i could be the map sensor also i had it happen on a 99 cobra. but iam not sure the 96-98 have them just something else to check.

[Blackout]

As far as I know... these cars don't have map sensors. They were replaced the OBD II computer driven Mass-Air systems.

[700hp04mystic]

ok does the 99 have the map sensor i was sure that is what is on the back of the intake and thats what i replaced on my 99.mabye its call somthing diffrent.

[Blackout]

I might be standing corrected.... I know for a fact that the 03-04 cobras use the for referencing boos in cunjunction with the mass air, and as I have read the 99-01's may also.

If it does have this, then yes it can cause an all the time rich condition.

[Adam@S&MMotorsports]

Did your tuner turn off the rear O2s? I'm assuming you are datalogging it and that is why the O2s are saying its rich. If that is the case and the o2s were switching and reading close to each other it's probably tune related...

[NXcoupe]

i have a 96 cobra that has been loading up and running rich on fuel since i cut the cats off...it has an x pipe with cats on it until i had them cut off the front o2s were reading rich tried replacing coils and spark plugs still no luck...car runs perfect the 1st time you start it in a day but 2nd time and any after that it loads up just had the car tuned the day before i cut the cats off also and it ran perfect any ideas?

Take it back and get it retuned.

[Night/MareCobra]

yes i only cut off the cats sorry bout the confusion and the guy who tuned it turned the back o2's off i just replaced both front o2's also now the car only loads up for like 3 min after start then clears out and runs fine

[Adam@S&MMotorsports]

yes i only cut off the cats sorry bout the confusion and the guy who tuned it turned the back o2's off i just replaced both front o2's also now the car only loads up for like 3 min after start then clears out and runs fine

It is probably clearing up once it goes into closed loop. Sound like a tuning issue for sure...

[Night/MareCobra]

yeah thanks for the advice i guess tuning it will be the next step whats your thoughts on some good places to get it tuned? dayton performance is the one who just tuned it

[blown96cobra]

Take it back to mike and have him check it out on the dyno.