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Rev counter indication.
Posted: Sun Jul 12, 2020 3:26 pm
by jmec
Hi, has anyone have their rev counter reading 750 with ignition off? When the ignition is on it returns to zero and is fine with normal running. 325i cabby 1990. Thanks in advance.
Re: Rev counter indication.
Posted: Sun Jul 12, 2020 6:28 pm
by Brianmoooore
Yes, it's a characteristic fault that sometimes occurs with the later type of SI board. No idea what the problem is at component level.
Re: Rev counter indication.
Posted: Mon Jul 13, 2020 10:58 am
by jmec
Thanks Brian. I can live with that. Good to know there's nothing serious lurking.
Re: Rev counter indication.
Posted: Mon Jul 13, 2020 1:31 pm
by Brianmoooore
Might be worth checking how much life is left in the SI board batteries - I don't think I've ever specifically checked them on a cluster displaying this fault.
They are 3 volt each, and are non rechargeable, so as more and more E30s spend the winter months in hibernation with the battery disconnected, flat SI batteries are going to become common.
Re: Rev counter indication.
Posted: Tue Jul 14, 2020 4:29 pm
by jmec
I changed the batteries about a year ago and use the car all year round. So I'm pretty confident they're OK.