Right, I just set up a Air Fuel Gauge, it is fine on idle with the reading slowly going from lean to rich as the engine warms up. However, when driving the reading is VERY eratic, jumping from lean to rich and back again constantly. Does anyone know why this is as it's getting anoying. :mad:

Thanks.

i think you need a wide band sensor for those

i think you need a wide band sensor for those

 

I've heard that they work better with a wideband sensor but would that cause the eratic readings (from left AND right feeds) ??

Phil a lot depends on excatly which type you have, but generally on normal driving it will bounce up and down, put yer foot down and hold the revs highish and see if it stays around a constant point. Assuming you've wired it into the ECU ? which is a closed loop, it won't give an accurate reading till around 2.5k revs.

hth

cheers

smithy

If it is a standard AFR gauge then they are almost useless for everything other than decoration.

On full throttle they should show rich as on closed loop they cant read the signal correctly.

During normal driving it should pop up and down quickly as the lambda signal operates to adjust the fueling.

For real monitoring of the AFR you need a wide band lambda set up.

Cheers. It is wired to the ECU, pin 55 and pin 29 switchable. The idea was to use the gauge to get a reading while setting up the fueling for advanced ingition timing and using a APEXi AFC but it's prety useless. Also the AFC I have seems dead too, it's been in storage for ages. Should it light up when connected and ingition is on ? Mine doesn't and the car just splutters and dies when the AFC is connected to the ECU (at pin 26 I think) ??? Runs fine when I disconnect the AFC.

 

 

If it is a standard AFR gauge then they are almost useless for everything other than decoration.

On full throttle they should show rich as on closed loop they cant read the signal correctly.

During normal driving it should pop up and down quickly as the lambda signal operates to adjust the fueling.

For real monitoring of the AFR you need a wide band lambda set up.