Technical bouncing needle?

[MickeyBravo]

whats the reason for the speedo needle bouncing?
is it down to the alternator?

Mike

 

[MrMigs08]

Is it idling, remaining constantly rev ready?

If so could be alternator or just the dash plug maybe a tad loose/worn.

 

[MickeyBravo]

Yer its idling fine just under 1k its just when i go out it starts to play up.ive always known it to be the alternator as ive this problem in a previous car.

 

[MrMigs08]

Yeah should be fine unless your idling is rough! never had alternator mess with counter personally, but i know that slamming my door can sometimes bounce the needles with the o'l marea haha!

 

[lownwide]

Mike,

I've just had a similar thing on my HGT, turned out to be the main engine earth on the gearbox.

Mine started by bouncing around when I was out driving, then the temp needle climbed off the scale a few weeks later, then the rev counter wound its way round to the facia and stuck there, then the car wouldn't start. Chucked a jump lead from the battery to the engine and everything went back to normal (except the bloody rev counter which is firmly wedged.......) Since then I have re-made the earth connection and also stuck a couple of slightly smaller earths in as well, just in case it does it again!

Hope this helps,

Lee

 

[MickeyBravo]

Cheers lee ill go and check that main earth lead and give it a clean too.
I do think it maybe the alt aswell tho cos like i say when the sat nav was plugged in it started and also the wipers are slow.

But anyhow ill go and check over that earth lead
Cheers

 

[MickeyBravo]

not checked it yet due to getting home from work late,soon as i got time i will go over it.

just bought an alternator off a friend that the car had done 76k so once i receive it ill see how i get on.

 

[Rigby]

Mike,

I've just had a similar thing on my HGT, turned out to be the main engine earth on the gearbox.

Mine started by bouncing around when I was out driving, then the temp needle climbed off the scale a few weeks later, then the rev counter wound its way round to the facia and stuck there, then the car wouldn't start. Chucked a jump lead from the battery to the engine and everything went back to normal (except the bloody rev counter which is firmly wedged.......) Since then I have re-made the earth connection and also stuck a couple of slightly smaller earths in as well, just in case it does it again!

Hope this helps,

Lee

My car did EXACTLY the same a few weeks ago, an extra earth sorted the problem.

 

[MickeyBravo]

how do you mean you 're-made' and extra Earth?

not looked at it yet as been getting back late with work.fathers day tomoz too.will have to wait till i get an early finish

 

[lownwide]

I took the earth off the gearbox, cleaned everything up and re-fitted it using a spring washer between the bolt and crimp to ensure a bit of bite and to stop it loosening. Chuck a dollop of thick grease over it when you are done to keep the damp out!

I also ran two thick amplifier power cables from the battery -ve to a couple of different points on the engine to back up the main strap. You can never have enough earthing to the engine

 

[MickeyBravo]

ah righty,cheers for that i was back early today (mondays are quiet) so should have stripped it and try to sort it then BUT as the weather was nice i just had to go out in it on the school run with the missus LOL

ill crack on with it tomorrow or next day im back early

Cheers
Mike

 

[MickeyBravo]

Thought id replied lol

When i took the bolt out to clean the earth point up,i went to put it back in and the end of the bolt snapped :s I thought great,but i put the earth point over the bolt and screwed the bolt back in so now the earth point/lead is right against the gearbox with a washer .It seems to have done the trick anyhow