Speedometer Erratic when braking -MR2 Turbo

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mattyboy44
Posts: 56
Joined: Fri May 01, 2015 11:20 am
Location: Braintree, Essex

Speedometer Erratic when braking -MR2 Turbo

Post by mattyboy44 »

Hi

I have rev3 MR2 Turbo 1994, it has the mph clocks all changed but since I have had it I have noticed that the speedometer needle is erratic when braking going up quickly then back down like a surge of electricity has set it off. Sometimes when coming to full stop it can fly up to 100mph when I am doing like 5mph or completely stopped and back down again and then up and down a few times until it finally stops after a few seconds if that. This doesn't happen if I am not driving fir example if I start the car and put my foot on the brakes.

Anyone got any ides what might be causing this? Or can point me in the right direction please.
Thanks
thomp1983
Posts: 1545
Joined: Sat Oct 01, 2011 1:30 pm
Location: newark, notts

Re: Speedometer Erratic when braking -MR2 Turbo

Post by thomp1983 »

Sounds like the nylon cogs on the gearbox sender are becoming worn
mattyboy44
Posts: 56
Joined: Fri May 01, 2015 11:20 am
Location: Braintree, Essex

Re: Speedometer Erratic when braking -MR2 Turbo

Post by mattyboy44 »

thomp1983 wrote:Sounds like the nylon cogs on the gearbox sender are becoming worn


OK so can I replace or fix this? What do I need and where can I get it please?
thomp1983
Posts: 1545
Joined: Sat Oct 01, 2011 1:30 pm
Location: newark, notts

Re: Speedometer Erratic when braking -MR2 Turbo

Post by thomp1983 »

If it's the sender then it'll be a case of sourcing a new or second hand one and swapping them, if it's the part in the gearbox ive no idea how easy it is to replace.

Start by inspecting what's already there
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