Crazy A/F gauge

[tony_tsi]

1995 eagle talon tsi when i bought my car it came with a mounted a/f gauge i hooked it up i used shielded wire to hook up the gauge to the o2 sensor next to the turbo when the car is idiliting or i am going down the road the gauage reads rich lean rich lean and just keeps going back and forth

does this sound like a gaugage problem or a engine problem

after market modds t28 turbo, inter cooler , alumina inter cooler piping, BOV , GSX engin swap , removed ice box replaced with K&N filter

car seems to run fine only time gauage is steady is when down shifting gauage stays all the way to lean side

please help

 

[Mikes2Gen]

From what I understand the only accurate A/F Gauge is a wideband o2, connecting a a/f gauge to the narrowband on our cars is very un accurate which could be why yours is bouncing. I cant speak from experience but this is just what I've heard.

-mike

 

[Calan]

That's a useless narrowband A/F meter.

Read the rules and try searching before posting.

Search for "narrowband", "wbo2", "wideband", "A/F meter", etc... TONS of information on it

 

[nightspeed87]

Get a wide band.
But in the mean time might as well look at the afr gauge you have.
Its suppose to cycle back and forth like that, as long as under wot that it goes to the blue or green rich side id say you were alright.

 

[architechnik]

As nightspeed87 said, a stock O2 sensor will do that under all standard operating throttle positions. The oscillation is used to determine what A/F should be used by the ECU. I am not certain about a wideband operation, although I believe most send two separate signals - one to replicate the stock O2 that routes to your ECU and another just for a gauge, as you have, or aftermarket management system.

Depending on the oscillation frequency and magnitude compared to the air intake, the computer will decide how much fuel to use without referring to the loaded map. Only when the O2 sensor is determined unreliable by the ECU, such as WOT, will it lookup the predetermined values of the installed map.

 

[JayRolla]

That's a useless narrowband A/F meter.

Read the rules and try searching before posting.

Search for "narrowband", "wbo2", "wideband", "A/F meter", etc... TONS of information on it

Why dont you read the rules on the bottom and you will see you can not post "use the search answers".

To the OP when you not at WOT the NBo2 will just cycle like yours is doing. Once WOT you should get a solid color. But like they said its just for looks and a fun blinking light show to show off to the women when they ask "what is that?".