E30 Zone

Hi,

I just bought an Air/Fuel gauge from supercheap, goes very well withteh cars lighting scheme. Got all the wires connected bar one, the o2 signal wire. from what ive read on the net, on a motronic 1.0 car, ecu pin 24 is the o2 connector. so i jam it in and plug it all up, and the gauge acts quite strangely

It goes to Lean/Stoich midpoint when car is in ignition on state. and when car cranks it goes RICH, then settles jsut below Lean/Stoich. THEN, if i put the headlights on it travels toward lean, stereo on, further towards lean.

So weird....

Does anyone knoq what the correct pin is, or better yet wire colour?

Adam

Bump....

I'm assuming your car has an o2 sensor fitted?

If it exists, O2 sensor wire is probably black.
Don't expect to get accurate results from this kind of AFR meter, as the O2 sensor is virtually a switch, producing a voltage output when oxygen is present, and no voltage when it's not.

Yeah it has an o2 Sensor, i connected it into teh ecu harness, im just wondering where the interferance is coming from? Brianmooore, is that because it is a narrowband sensor yes?

Probably I have seen a AFR gauge hooked up to a <=4 wire lambda sensor(narrowband) and it was as good as useless. You need to find out whether the cheap gauge can support a wideband sensor. If so, they are becoming quite cheap these days.

ok thanks