Dodgy speedo!!!

[Knight_Rider]

Only just noticed this problem last couple of weeks. When accelerating above 60 the needle "dithers" as though it's sorta getting stuck, and rather than a smooth motion jerks around between 60-80+. Works fine (so far) below 60? Any suggestions? Did a quick search but didn't find anything tbh. Very annoying tho!!
Also when I brake the rear foglight indicator light on the dash flickers on weakly? Could this be connected or totally separate and bulb related? French wiring eh!

 

[Knight_Rider]

Bump

 

[Nick172Cup]

Try a speedo sensor if you have one on your gearbox, mine was playing havoc like what you've described as well as not even registering speed at all!

 

[Terry172]

Speedo sensor as mentioned...

As for the light flickering, take your rear lights off and clean the connections on the connector and the bulb holder

 

[Ex-User (19928)]

Light flickering could be an earth problem and the fact your speedo is only affected at certain speeds could be linked..

But the speedo sensor is a common fault, it's about £20 from Renault and takes 5 minutes to change so I'd bet on that.

 

[Knight_Rider]

Thanks guys I'll give all that a bash

 

[Knight_Rider]

Lol should have asked how do I find and identify this sensor

 

[Nick172Cup]

Lol should have asked how do I find and identify this sensor

Top of the gearbox at the towards the back of the engine bay, should have a silver heat shield on it.

 

[Ex-User (19928)]

Ah it's a Ph2 172 you have? In which case I believe the pickup is from the ABS sensors. My bad, not sure how you fix that one.

 

[Terry172]

Yes ph2 172 speedo feed is taken from the abs rings on the rear brakes. Close inspection you will probably see damage to the teeth on the ABS rings. Not entirely sure if you can buy these seperate and fit them or whether it's easier to replace the rear discs with the abs rings already fitted

 

[Knight_Rider]

Right so were thinking rear brakes now rather than a gearbox sensor? :/

 

[Terry172]

Right so were thinking rear brakes now rather than a gearbox sensor? :/

Still thinking it's the same sensor mate (Speedo sensor) just different location because you have the ph2 model

 

[Ex-User (19928)]

Right so were thinking rear brakes now rather than a gearbox sensor? :/

Would help if you confirmed which model you have.

 

[Knight_Rider]

172 as it says on the left next to my name

 

[Ex-User (19928)]

Ph2 as your avatar suggests?

 

[Nick172Cup]

Dont take it as gospel that because it's a ph2 that it will be run off the abs, I've seen some of the things Renault have done over the years with regards to their 'parts bin' made cars.

 

[Knight_Rider]

Yeah ph 2 and yeah I agree.... My handbrake gator is totally different to my old one. Think they are thrown together from whatever they can find lol

 

[Knight_Rider]

Lol this problems getting worse now, on motorway last night accelerating up to 70, needle stuck at just over 60 for a few seconds before shooting up to 140!!! Then finally settled back at just over 75!!! Do we have a difinitive answer for where this ere sensor be located on a ph2 172?

 

[172lover]

cup or non cup??
as the speedo sensor is different on them....

iirc
the cups use the speedo sensor on top of the gearbox(as they have no abs...so they cant have abs rings)
http://www.ebay.co.uk/itm/RENAULT-C...arts_Vehicles_CarParts_SM&hash=item19c96a52e4

and for the "normal" 172 PH2 non cupped i think you need to weld the abs rings.

 

[Knight_Rider]

Non cup..... Is that gonna make this whole thing a bigger ball ache?

 

[philsheldon]

hi
my sport 172 ph2 has just started the speedo fault intermittently, whats the best course of action? rear wheels off and give ABS rings a good clean and inspection? sorry to drag up old ground guys, just need a little help.
cheers phil

 

[edde]

If you have a phase 2 none cup then your speedo sensors (bar the odd few early cars) comes form the abs system if theres a speedo issue check your abs rings on each one one will most likly be cracked you can buy replacments from places on ebay etc just make sure they are wide enough and have the right number of teeth. If this doesn't work you need to find out what sensors faulty and chnage it its often the front ones for some reason.