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e34-520iSE View Drop Down
Really Senior Member I
Really Senior Member I
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Joined: 22-December-2003
Location: Gateshead, UK
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Points: 453 		Direct Link To This Post Topic: Why no o2 sensor?
    Posted: 18-February-2005 at 14:49
Hi all! Why is my car (early '90 M20'd 520) not fitted
with an o2 sensor? It seems to be a very important
part on other models fitted with Motronic ECU's. If the
Motronic unit needs an o2 sensor input, then surely
the lack of one will richen the mixture? Just a
thought!

Cheers,

Shaun
Self confessed madman
1990 Brilliantrot 2 ltr M20.

Air force definition of explosives: A loud noise followed by the sudden going away of what was once there a second ago.



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Steve W View Drop Down
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Joined: 08-January-2003
Location: United Kingdom
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Points: 84 		Direct Link To This Post Posted: 19-February-2005 at 09:36
Oxygen sensors were only usually fitted to Motronic systems when a catalytic converter is present. This is mainly to protect the catalyst from under/ overfuelling.
The Motronic without oxygen sensor uses a pre programmed map of values to run the engine, instead of relying on the lambda signal.
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e34-520iSE View Drop Down
Really Senior Member I
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Joined: 22-December-2003
Location: Gateshead, UK
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Points: 453 		Direct Link To This Post Posted: 19-February-2005 at 16:17
Thanks for that Steve. So does that mean a M20'd
525 of a similar age also has no O2 sensor? Any
idea if a cat was ever fitted to an E34 M20 block in
the UK?

Cheers,

Shaun
Self confessed madman
1990 Brilliantrot 2 ltr M20.

Air force definition of explosives: A loud noise followed by the sudden going away of what was once there a second ago.



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e34m5 View Drop Down
Really Senior Member II
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Joined: 26-June-2003
Location: Near Rugby, Warwickshire
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Points: 1344 		Direct Link To This Post Posted: 19-February-2005 at 16:28
According to the ETK catalytic converters were available on all E34's from 1987...


Miles

1991 525i Sport Manual


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