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Johnie Boy

Member Since 13 Jul 2009
Offline Last Active Jul 24 2009 06:01 PM
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Topics I've Started

Speedometer wobble

22 July 2009 - 01:05 PM

Like Leighfos’s post in the Fiesta forum on 25 May 09, the speedo on my wife’s Fusion 1.4 (53 plate) bounces, wobbles, and overreads, then settles down for a while, before starting off bouncing again.

I am fairly sure that the Fusion has an electronic speed sensor fitted to the transmission in place of an old-style speedometer cable (but there is no Haynes manual for the Fusion – they say to use the Fiesta Mk5 one instead).

The bouncing speedo problem may have started when I changed the clutch and had to disconnect all the cables etc from the transmission/gearbox area. I had difficulty disconnecting the speedo cable connector, so I removed the whole sensor (as if an old-style cable). The sensor had been bound in foil tape, which I unwound before removing the sensor. I rebound the sensor with the same tape on re-assembly.

I suspect the bouncing is because either the sensor is dirty or damaged, the cable connections are dirty or broken, or the tape binding is inadequate. I have briefly tried re-attaching the cable connections and re-binding the sensor, but got no improvement.

Before I try replacing the sensor itself, I would be grateful if anyone had any suggestions, or knew how to find what is really wrong?

Thanks

JohnieBoy

Speedometer wobble

22 July 2009 - 01:00 PM

Like Leighfos’s post in this forum on 25 May 09, the speedo on my wife’s Fusion 1.4 (53 plate) bounces, wobbles, and overreads, then settles down for a while, before starting off bouncing again.

I am fairly sure that the Fusion has an electronic speed sensor fitted to the transmission in place of an old-style speedometer cable (but there is no Haynes manual for the Fusion – they say to use the Fiesta Mk5 one instead).

The bouncing speedo problem may have started when I changed the clutch and had to disconnect all the cables etc from the transmission/gearbox area. I had difficulty disconnecting the speedo cable connector, so I removed the whole sensor (as if an old-style cable). The sensor had been bound in foil tape, which I unwound before removing the sensor. I rebound the sensor with the same tape on re-assembly.

I suspect the bouncing is because either the sensor is dirty or damaged, the cable connections are dirty or broken, or the tape binding is inadequate. I have briefly tried re-attaching the cable connections and re-binding the sensor, but got no improvement.

Before I try replacing the sensor itself, I would be grateful if anyone had any suggestions, or knew how to find what is really wrong?

Thanks

JohnieBoy