rich71 Posted June 7, 2016 Share Posted June 7, 2016 Hi all, if anyone can help in any way it would be great, my tacho has decided to have a mind of its own and goes wild on acceleration and takes a few seconds to settle back down afterwards.Does anyone have any tips of what to check, it is an ECU2 1.6K 1997 supersport. I am also concerned that if it is at the sensor end then would this affect how the gear change light/rev limiter cuts in? Where does the tacho get its signal from initially before the ecu?ThanksRichard Link to comment Share on other sites More sharing options...
Markharrison2 Posted June 7, 2016 Share Posted June 7, 2016 Let me know if you solve this I have a similar issue, although I have a slightly newer car, cheers Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted June 8, 2016 Member Share Posted June 8, 2016 ... my tacho has decided to have a mind of its own and goes wild on acceleration and takes a few seconds to settle back down afterwards.Do you think it temporarily underreads, or is it sometimes overreading?My suggestions for investigating Mark's.Jonathan Link to comment Share on other sites More sharing options...
rich71 Posted June 8, 2016 Author Share Posted June 8, 2016 Jonathan, yes it probably does under and over read as the needle waves about or it may just under read and the max needle is what it actually is.So far i have taken the Tacho out and given it a gentle shake and the needle moves freely, i can probably get it to read 4k by doing this as a guide, is it meant to?I have also unplugged and reconnected the leads on the coil, haven't tried it since as started raining, in the garage it seems ok but it did before when stationary.Richard Link to comment Share on other sites More sharing options...
Bricol Posted June 8, 2016 Share Posted June 8, 2016 On older cars I've had the same with a bad earth to the instrument. Link to comment Share on other sites More sharing options...
rich71 Posted June 8, 2016 Author Share Posted June 8, 2016 I will check, just need to remember the multimeter from work Link to comment Share on other sites More sharing options...
rich71 Posted June 9, 2016 Author Share Posted June 9, 2016 Quick update, seems unplugging and plugging everything back in has worked.... Link to comment Share on other sites More sharing options...
rich71 Posted June 9, 2016 Author Share Posted June 9, 2016 wobbly speedo also fixed by loosening the angle drive thumb screws giving it a shake about and re-tighten Link to comment Share on other sites More sharing options...
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