Re:<e28> 87 528e problems with oxygen sensor

[Erick Baumeister <erickbau@xxxxxxxxxxx>]

Shawn,

Your Engine management system was designed to use the heated 3 wire
sensor. A single wire sensor won't get hot enough on its own to send the
correct signal consistantly. I installed a Bosch 3 wire sensor from
Grand Auto ($41) in my '88 535i to cure the problems you are
experiencing. I believe the application was for a '90 mustang 305 V8.
Just splice the wires from the old harness to the new sensor, making
sure you get the signal wire right. The other  2 wires(heat circuit) are
interchangeable. Don't forget to apply your choice of weatherproofing on
the splice to ensure an unimpeded signal.

Erick Baumeister
'88 535iA Dinanized, Baumeisterized, etc.

> I recently replaced my oxygen sensor in my 87 528e with a bosch 
> replacement single wire sensor.  After I had finished the replacement 
> the car will hesitate intermittently.  I performed the diagnostic checks 
> on the sensor as described in the bentley manual and the sensor seemed 
> to be working properly.  I cleaned the connections between the sensor 
> and where it plugs into the car.  That seemed to cause the hesitation to 
> decrease but it still hesitates every once in a while.  Does anyone have 
> any comments on how to fix this problem?  Thanks for the help in 
> advance.
> 
> Shawn

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