Rev counter bouncing all over the place

[Zippee]

My rev counter has started bouncing very erratically, when I stop accelerating instead of a steady needle it bounces up and down massively before finally settling on the correct RPM. Any ideas what would cause this?

[tvrbob]

This is often due to HT leads shorting out. Re-route them so that they don't rest on any metal surfaces and see if that solves ot for you

[blitzracing]

Not fitted magnecors have you ?

[peteA]

blitzracing said:

Not fitted magnecors have you ?

I have recently fitted magnecors to my Chim400 and the bouncing actually improved over the last set!

Not sure what the cause is but is seems to be quite common?

[Zippee]

blitzracing said:

Not fitted magnecors have you ?

Yes - but they've been on the car for 2 years and over 15'000 miles. The rev counter has only been playing up recently.

[Seasider]

Is it all through the range Zip ?










Or your normal 3500 rpm max

[Cider Andy]

Check the connections to the LT (12V) side of the coil. Make sure the HT leads are routed away from the LT wiring: maybe one of the HT leads has moved?

It's usually caused by the LT wire back to the rev counter picking up interference from the HT system. As someone else suggested, check for a faulty HT lead, but also check the rest of the HT system: coil, distributor cap, rotor arm. Noted any misfiring?

[Ashv8]

Zippee said:

My rev counter has started bouncing very erratically, when I stop accelerating instead of a steady needle it bounces up and down massively before finally settling on the correct RPM. Any ideas what would cause this?

Hi Zippee did you manage to get this rev problem out?

as i have had the same problem today

also it was cutting out when coming up to a stop

and strong smell of feul?

could you please help

ps i have just got my Chim from from Offords

Regards

Ash

[Seasider]

Ashv8 said:

ps i have just got my Chim from from Offords

Get them to sort it out

[Ashv8]

Seasider said:

Ashv8 said:

ps i have just got my Chim from from Offords

Get them to sort it out

Hi Del

thanks for your comment

all fairness Offords have said they would sort it out!!

i just wanted to be a mechanic for the day!!