ph-quick speedo & sensor

[RichMcc]

Folks need to know about how the speedo works, the speedo sensor is on the gearbox so I need to know how it works from inside the box to the dials to help diagnose a problem.

Any info appriciated

 

[RichMcc]

Bump, problem Im having it seems somethings coming loose.
If I drive the car gently the speedo seems fine, but if I put my foot down it goes haywire wildly moving up and down, or if I go above 80 it starts waggling about.
Just been testing it again and I heavily put my foot down and it dropped to 0 for a few seconds then came back to life.
Now one of my mounts is shagged so the engines moving about more than normal so it seems like its loosing connection with the sensor?

Anyone got any ideas?

 

[skinner]

IIRC the connections to the dash are multiplexed so it is not going to be at the dash end. Try the dash trick (hold in trip computer stalk button whilst turning on ignition) anyway to make sure the speedo is ok.

 

[RichMcc]

Yep done that its fine so its gotta be either the sensor or the connection to the sensor or something along those lines

 

[16v_jon]

check the earth on the gearbox its down by the gearbox sensor

 

[RichMcc]

where is the sensor anyway?

 

[edde]

where is the sensor anyway?

Its at the back of the gearbox. I'm sure someoen posted a pic a while back.

 

[RichMcc]

To me it seems like a loose connection but I wanna know how it actually works.
I know its on the box but its not been right since the box was rebuilt, it worked then died off the first time I had the car back but only drove it back to my house then it went back.
Now its working most of the time its only when I really push the engine that it flakes out.
Examples
If I go above 80 driving smoothly gently accelerating it starts jumping around waving 10mph each way

Then I was coming off a roundabout in 2nd, gave it some beans and rose up to 60mph as normal then shot upto over 100, then back down.

If I put stress on the engine the whole engines gonna move about and that when it plays up so Im thinking its gotta be coming loose?

Thoughts?

 

[RichMcc]

Guys is this my speedo sensor? With the earth out of view and just to the right of it?
My speedo totally crapped out today so I unplugged this, jiggled it all about, went for another drive and about a min into the drive it started to work again.

 

[Fred@BTM]

thats the one

 

[RichMcc]

Can you buy the connectors anywhere? That bit connects to the sensor?
Is it easy to replace the whole sensor?
The earth seems a bit loose but not enough to cause this but I might take it off and give the surfaces a rub with some wet & dry.

 

[RichMcc]

:bump:

 

[ben_p]

clean the earth up, rich i can post you my sensor until you find a new one dude if you want

 

[ben_p]

my old one did the same, got a new sensor. job jone, i also cleaned up the cnections with contact cleaner

drop us a line if you want me to post mine

 

[RichMcc]

Are you not using your sensor or would you need it back lol?
How much was the new one can you remember?

If you look at this post, watch the 2nd vid thats what its doing under hard acceleration :S

http://www.cliosport.net/forum/showthread.php?t=248807

Or if I go above 80mph it starts going nuts too.

 

[ben_p]

yer mine used to do it @ 70 anything after that and it went awol!

it happends when you refit the box with the sensor in, if its knocked then they f**k up as its like a plastic wheel on a stick LOL

i dont need mine for like 10 weeks. ( i will need it back or a second hand replacement) upto you dude

 

[RichMcc]

hahah yep it waves about 10mph each way so I could be doing 100...or 90... or 110 who knows!

Is it easy to change? I know you gotta be strech armstrong to get down there lol

Fred said hes got a spare one
Its anoying I know the cars fast I just wanna know how fast...

 

[Fred@BTM]

it just pulls out rich

i'm not back in the uk until the 6th, so i can post it to you then

 

[RichMcc]

Groovy cheers Fred