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1991 940 idle issue 900 1991

posted by  OwenF on  Wed Jan 23 10:48 CST 2019
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last visit: Sat Jul 7 13:55 CST 2012
[RELATED]

well that's impressive Art!! Thank you very much. My 940 is one of the early 940s with the Yazaki instrument cluster, and as you may know these fail due to capacitor leakage. I have recently come to the end of my supply of working Yazaki speedometers so have had to replace it with an aftermarket speedo to meet the UK MoT test requirements. So I have no working original speedo and no speedo signal (my 940 has no ABS).
I had believed that removing the speedo would have no impact on anything else - all other instruments appear to work fine.

I had noticed the "no speed signal" diagnostic code but thought it of no consequence.

Could I ask a couple of questions please?

1. how/why should the speed signal have any impact on the idle speed, especially as it is overcome by a restart?

2. How important is it that I try and rectify this - am I likely to be doing any damage, perhaps affecting the fuel mixture strength etc?

Many thanks again

OwenF






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