07-03-2018, 11:49 AM
For some time, now and again, whilst driving, I have had cause to look at the tacho, as now and again out of the corner of my eye I seem to have seen ( or think I have ) the tacho "glitch", but on looking at the tacho, all seems normal. Its as if the tacho suddenly stopped working, making me look at it, only to find all is well ?
Anyways, reconnected the battery yesterday and all was normal, even the door locks for a minute, but now and again the tacho seems to have a glitch and momentarily stop working, with the needle dropping about 200 revs from 2000, only for the tacho to start working again and the needle return to 2000rpm, all in the matter of a second. There is no dip in engine speed or noise or revs or any misfire, just the tacho needle drop and then return ??
Please can someone tell me what drives the tacho, the flywheel "rev counter" or the cam "rev counter" sensor ??
I did notice the quite quiet high pitched whistle/whine noise again, maybe linked ??
Anyways, reconnected the battery yesterday and all was normal, even the door locks for a minute, but now and again the tacho seems to have a glitch and momentarily stop working, with the needle dropping about 200 revs from 2000, only for the tacho to start working again and the needle return to 2000rpm, all in the matter of a second. There is no dip in engine speed or noise or revs or any misfire, just the tacho needle drop and then return ??
Please can someone tell me what drives the tacho, the flywheel "rev counter" or the cam "rev counter" sensor ??
I did notice the quite quiet high pitched whistle/whine noise again, maybe linked ??