on the 16v, which wire is the signal and which wire is the ground to the O2 sensor? i'm installing an air/fuel gauge and i need to know. my understanding is that i should not try to test the sensor with a voltmeter because it may damage it.

thanks,

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dew
86' 190e 2.3L 16v

Jason,

There are three wires to/from the O2 sensor. The two that are the same gauge and use the same connector are the power and ground for the sensor. The single green (?) wire with a different plug is the signal wire to the ECU.

You won`t damage it by reading the voltage from the sensor. Leave the power/ground wires connected to keep it properly heated and make sure the motor is good and hot.

The green signal wire is shielded, so be careful if/when you decide to splice into it.

Tinker

what special precautions should i take to spice the shielded signal wire? i am planning on splicing into it.

thanks,

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dew
86' 190e 2.3L 16v

you will want to solder the wires from the 02 wire to the Ecu'
you don't want to just twist it up ,it will get a worry reading,
hey what meter are you using? I was thinking about going with a
mixture read gauge to replace the dead stop watch, Kn has a nice one.
Dave

Jason,

A sheilded wire is a wire within a wire. The inner wire carries the signal, the outer wire is grounded. Make sure you don`t get them crossed AND you retain the ground.

Tinker

what i decided to do was just splice into the wire on the O2 sensor instead of modifying the shielded wire that is part of my car.

i got it hooked up today and it works great. i already adjusted my EHA based on the info i got from the gauge. when i went for another test run my adjustment was evident on the gauge. that's rewarding.

i'm using the Auto meter A/F gauge in 2 1/16". it has 20 LEDs in 3 colors red=lean orange=stoich and green=rich. i payed $60 for it including shipping.

thanks,

__________________
dew
86' 190e 2.3L 16v