Silver-bullet99

Alright so i've been having trouble for a while now to get my 99 GT dynotuned. The tuner guy told me that the o2 sensor were "dead" i replaced all of em and even the whole engine wiring harness and still nothing-.- my question is can i use a wideband sensor to get the car tuned?

uberstang1

What do you mean there dead, if your conputer had no upstream o2 sensor readings it would run like *** and through a bunch of codes. The car needs upstream o2s to work as they provisw data to the ecu. A wideband sensor cannot do that

audioAl

You did a new wiring harness? Man that's some money!

Mike@DiabloSport

Yeah, what is 'dead' exactly?

Sounds like it was previously tuned to run in Open Loop, not uncommon on some of these cars depending on who was doing the tuning, and why...

Soldier GT

What mods do you have?

Silver-bullet99

No i dont think my stang has ever been tuned, i was just trying to tune it since i had gotten the engine rebuilt and put some comp cam 270's but i showed up to get it tuned and he plugged up the tuner and everything and then told me the o2's were not working he showed me a dynotune file off another mustang on the computer how the readings suppose to be moving up and down like "mountains i guess you can say, sorry for the brainfart lol and my reading for the o2's were just flat lines _______ <---like that hopefully ya'll can understand what im trying to explain..this was my first car i've ever tried to dynotune so im new to this:/

Silver-bullet99

No i dont think my stang has ever been tuned, i was just trying to tune it since i had gotten the engine rebuilt and put some comp cam 270's but i showed up to get it tuned and he plugged up the tuner and everything and then told me the o2's were not working he showed me a dynotune file off another mustang on the computer how the readings suppose to be moving up and down like "mountains i guess you can say, sorry for the brainfart lol and my reading for the o2's were just flat lines _______ <---like that

Silver-bullet99

And also the car really runs like crap too and for the mods, im full bolt ons except for plenum and u/d pulleys..

VTX1800N1

You said you rebuilt the motor. Are you sure the harness for the O2 sensors got connected at the top front of the transmission?

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audioAl

My cousin's husband builds racing harnesses in Tennessee, maybe give him a call? motorvationefi.com