Thread: O2 Sensors or no O2 Sensors?

Hi. I am wondering if my disco should have O2 sensors or not.

It's a 1996 3.9 and while it has standard headers, it has twin engine pipes (might be normal, dunno). It's running quite rich, floods on startup and often makes passengers feel a littel stoned on the fumes if some come into the cab.

Average L/100km 23.24219

Average MPG 10.65969

Bought the car a few months ago and have changed air filter and had new vacuum advance installed, but nothing else yet. All I can think of is there should be O2 sensor/s, but there are none installed.

Have been considering upgrading ecu, installing a power amplifier (or whatever it is) and maybe changing the MAF for a newie (if they exist). Maybe also change exhaust system for freeflow headers and fatter main and tail pipe/s. It's all a bit costly, but might be worth it.

Any valid ideas would be appreciated ?

The basics are ...
Make sure that the motor comes up to temp ... IE thermostat works and the temp gauge gets to half way

Measure with a multimeter that the Temp sender unit works .... Located just in front of the passenger side front Injector (piston number 1) .... fitted to the intake manifold / same twin wire plug as the injector
Should measure 5000 Ohms when cold ... 300 "odd" Ohms when motor at temp .... A Rave CD (workshop manual) from "Shop" (look at the top of your screen on this browser) .... will help you big time


Remove the MAF .... Take off the large C clip holding the wire gauze mesh ... Look inside the MAF and you will see a 6mm hole ... shine a torch in the hole and you will see a light globe type filament ... clean that wire with a spray of circuit board cleaner .... Reassemble


Advance the Dizzy to 9 degrees


Cheers
Mike