88 535i inspection light

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David N Emmet - 18 Nov 2004 22:28 GMT

My 535i will have the tach fail, and the inspection light come on
intermitently.
Car runs fine and does not stumble when this occurs, and corrects itself in
just a moment or two.
Any thoughts?

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Bill - 19 Nov 2004 00:51 GMT

Sounds like the circuit board batteries failing or a loose/bad connection
on/into the instrument cluster.

My 535i will have the tach fail, and the inspection light come on
intermitently.
Car runs fine and does not stumble when this occurs, and corrects itself in
just a moment or two.
Any thoughts?

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Grant - 19 Nov 2004 13:03 GMT

Welcome to my world. I have an 87 535i and experienced the same problem
for a while........until it failed for good. I've been meaning to fix it
and understand that there the problem may be related to 2 batteries behind
the dash. Good luck.

Grant

> My 535i will have the tach fail, and the inspection light come on
> intermitently.
> Car runs fine and does not stumble when this occurs, and corrects itself in
> just a moment or two.
> Any thoughts?

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Bill - 19 Nov 2004 20:44 GMT

I've seen the intakes from BMP and BavAuto for late models. I was wondering
if there was something better for the M30 ('86 535i). I'm not talking about
the filter mods, but the actual intake manifold. Maybe something that
doesn't cross over the head. Has anyone retrofitted a newer hotfilm/wire air
mass meter to the earlier M30?
Bill
'86 535i U.S.

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