Dancing rev counter

[UIL9794]

Hi Guys,

I've just changed my dizzy cap,rotor arm, coil, h/t leads and plug extenders - they were all past there sell by date. But now i have generated a dancing rev counter - the car is revving normally but the counter is all over the place. Just looked in the bible and am now wondering if it's because i've fitted splitfire leads? Any ideas?

Lee

[GreenV8S]

Worth a quick check to make sure the sensor wire from the dizzy to the ECU isn't running too close to your HT leads, if so it can pick up stray pulses. The wire is usually a single wire coming from the ignition module, over the rocker cover, under the throttle body and joining the main loom where it goes through the bulkhead into the passenger's footwell. It runs quite close to the HT leads over the rocker cover.

[jigs]

Your dancing Reverend Counter reminds me of the dancing priest in Father Ted - life imitating art!

[the dodger]

Lee, I just responded to your other post where I mentioned I also changed my HT leads (Magnecor), dizzy cap, arm and coil - and I HAVE THE SAME PROBLEM NOW!

I'm sure I even headed my earlier post on this with the same title! - spooky. Does your tacho RISE when you take your foot off at say, 3000rpm? Mine rises about 500rpm at any speed from 2500rpm.

I didn't get any positive results from moving wires and checking l.t. connections - it's still the same. Please let me know if you find anything via my e-mail.

[UIL9794]

Hi Dodger,

I tried moving the leads also but doesn't make any difference at all - the tacho seems to be reading not quite double what it should be and seems to rise and fall easily - engine revs constant!

I've done a search and one person who fitted magnecor leads had their rev counter out and sent off for repair - as apparently changing the leads/coil/dizzy cap etc shows up any faults with the rev counter? Not to convinced really.

Lee

[edhorne]

My tachometer used to dance about. That was until Mark Adams diagnosed the coil as a sub standard pattern part which was shorting out inside. The old one was replace with a Bosch coil and the problem was cured instantly.

I know you said you replaced yours but is it the correct one. Mark said the one I had was a TVR coil but they are nowhere near as good as the Bosch ones.

Hope you get it sorted I know how annoying it is.

Cheers

Ed

[the dodger]

Replaced my Bosch coil with a (newer) Bosch coil. I may try changing back as I don't think there was anything wrong with the old one.

May not be doing it for a while but will advise outcome on here.