Somethign is going weird after my install of my A/F gauge.... i tapped into the wires gong into the ECU and the gauge spastically changes from lean to rich to stoic... it won't stay steady? what do you think? bad connection or bad car?

It's supposed to do that. Only at WOT will lit be a constant. Try going out and putting the pedal to the floor and it should read rich.

mine does that too,it's supposed to fluctuate as the computer tries to keep the mixture stoic.

Originally posted by 89ssgti
mine does that too,it's supposed to fluctuate as the computer tries to keep the mixture stoic.

it fluctuates so damn much i can barely tell whats going on.

Originally posted by igo4bmx


it fluctuates so damn much i can barely tell whats going on.
did you solder the splice?:confused:
mine goes lean at idle when cold,then goes up to like half when warmed up,but fluctuate a bit,and at full throttle it stays where it is.
Btw,I connected mine on the sensor wire,just after the connector for the O2 sensor.

the ECU program uses the "law of averages" to create a stoich reading ;)

Originally posted by 89ssgti

did you solder the splice?:confused:
mine goes lean at idle when cold,then goes up to like half when warmed up,but fluctuate a bit,and at full throttle it stays where it is.
Btw,I connected mine on the sensor wire,just after the connector for the O2 sensor.

i used a tap because i was afraid of generating too much heat on that sensor with a solder.

Originally posted by igo4bmx


i used a tap because i was afraid of generating too much heat on that sensor with a solder.
I unplugged mine when I solered it,tap sucks,it could be the only thing messing up your readings.I would lenghten the wire and splice it as close to the o2 sensor plug as possible(on the engine harness side).

Originally posted by 89ssgti

I unplugged mine when I solered it,tap sucks,it could be the only thing messing up your readings.I would lenghten the wire and splice it as close to the o2 sensor plug as possible(on the engine harness side).

i spliced it like an inch from the ECU..

Originally posted by igo4bmx


i spliced it like an inch from the ECU..
I did mine in the engine bay,just before the sensor plug on the engine harness,but I guess at the ecu is good as it's the same wire:D
I'd still solder it though

Originally posted by 89ssgti

I did mine in the engine bay,just before the sensor plug on the engine harness,but I guess at the ecu is good as it's the same wire:D
I'd still solder it though

one thing i've noticed is that the gauge reading even moves up and down, during idle. and sometime the light just goes out... WTF

Originally posted by igo4bmx


one thing i've noticed is that the gauge reading even moves up and down, during idle. and sometime the light just goes out... WTF
it's normal,if you let off the gas and coast,the computer doesn't inject any gas,if you press back on the gas,the reading will show up.
also the computer monitors the ratio and change it all the time to try and stay as close as possible to stoic

Originally posted by igo4bmx


one thing i've noticed is that the gauge reading even moves up and down, during idle. and sometime the light just goes out... WTF
my friend's did that when all 4 pistons were misfiring in his Lude.

Originally posted by sweetcarz.com

my friend's did that when all 4 pistons were misfiring in his Lude.

*old horror movie music* DUH DUH DUHHHHHHHHHHHHHHHHHH
:devil: