Stupid question re Defoulers

[engineermike]

Are we trying to attribute 10% change in trims due to the rears? That shouldn't be possible

https://www.mustang6g.com/forums/th...-or-not-with-boost.206006/page-4#post-4133619

I have direct experience with 2 cars with the 10% issue and 2 more have reported here.

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[Upallnight91]

Seen it in 2 cars myself first hand

 

[robvas]

I have direct experience with 2 cars with the 10% issue and 2 more have reported here.

It's very possible that other thread isn't completely accurate.

How often do you see cars with defoulers run without issue?

Does it happen without defoulers? Does it make more sense to just live with the light than try to avoid it?

 

[KBR Stang]

I believe what I see rather than what Im told. I ran the anti foulers with GESI UHO cats. Within three or 4 drive cycles I could see the LTFT going richer. When it hit 12% I reset it. Same thing happened again. Start out fine and then goes out of wack not to.mention the heater and o2 sensors wont set.

At the time I was able to turn off FAOSC, the rear O2 sensors, fault codes, and heaters. I drove the car a month and the LTFT stayed at 3% rich. When I put everything back to stock and turned everything back on, same results. Sits at 3%, stay 0 to 1%. There is something to it.

That's what I've been worrying about. I don't want to spend $1300 on GESI Gen 2 UHO just to have the same issue...ugh.

 

[junits15]

That's what I've been worrying about. I don't want to spend $1300 on GESI Gen 2 UHO just to have the same issue...ugh.

Unfortunately the only cats that will guarantee no check engine light without defoulers or disabling P0420/P0430 are factory cats.
And GT cats are not going to last under boost.

 

[Robottrainer]

That's what I've been worrying about. I don't want to spend $1300 on GESI Gen 2 UHO just to have the same issue...ugh.

Mine are sitting in my basement in case one day It's my only option.

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