Bouncing tacho needle.

[coolngroovy]

I noticed this today.
When decelerating the tacho needle falls then bounces at approx 1000 - 1250 rpm. This seems to be common when driven over 80kph.

When slowing down to a stop from 60kph, i can almost feel the car surging/stopping, but it's only 250rpm & i might be imagining it.

Any ideas?

 

[Aaron6.93]

My vp did this. Taking my foot off the accelerator completely at 110 km/h the tacho needle would bounce as you described. I think it's normal.

 

[thatbrynguy]

My VY V6 Auto used to do that when rolling down a hill in drive. Never seemed to be a problem.

 

[delcowizzid]

its sort of normal ish LOL its part of the ecu programming deceleration fuel cut generally you dont feel it or see it untill you fit an exhaust and the tune gets slightly out of wack

 

[coolngroovy]

Strange!

Thanks for the replies.

 

[mpower]

sounds like a loose wire somewhere to me, if only the tacho.

The surging is what I'd be concerned about.

 

[Kiddo]

My laser did this, turns out it was my alternator starting to go.

 

[meady_183]

My old vy used to frequently have a bouncing tach needle...
Narrowed it down to the road being slippery...

 

[adam26101]

its just dancing to the music. dont worry about it..

or get a new spedo mech or could even be faulty connection