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99 Grandeur xg - speedo drops back to zero spasmodically, returns to normal by decelleration been happening about 2 years. Now auto transmission drops from 5th into 3rd gear (get home mode)at speeds ranging 60kmh to 100kmh, spasmodically. Returns to normal by stopping, switching off & restarting. Dealer says elec fault but cant help & to see Auto elec. Auto elec says could take very long time to find fault.

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  • kenegmg Jul 23, 2008

    add to posted request - I already know the computer result - that is why I said the dealer advised - (electrical fault) I thought someone may have experienced my problems & found a solution but as the dealer said it looks like I'm on my own!!!

  • kenegmg Jul 24, 2008

    speedo wiring has been checked/re-checked - sender unit removed cleaned 3 times. I am more concerned with the automatic transmission problem - have had numerous guesses at solutions from mechanics/auto electricians - what I am looking for is a solution if no one can solve this,(having experienced & rectified the same problem) please just say so!

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I'm no expert but I would venture a guess that you have to look in 3 areas. First is the connections/wirings between the transmission, sensors and computer box. There has to be a fault somewhere, if your computer checks out ok then it has to be a faulty sensor sending the wrong data into the computer. Check the input and output speed sensor. This might also be the cause of sending wrong info to the computer. Another one might be the O2 sensor thought i think this might be unlikely. I hope this was helpful. Good luck.

Posted on Jul 24, 2008

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Check also wire harness connections (if dirty or loose) and fuse holder case.

Posted on Jul 24, 2008

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Check speedo wire may be it is loose

Posted on Jul 23, 2008

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It sounds liek you might have a fault in your computer that controls all your speedo and everything.

Posted on Jul 23, 2008

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The speedo gage drops down to zero while driving then drops down afew gears for afew minutes then comes back to normal.how can i fix this problem


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Speedometer goes to zero every now and then


Does this happen intermittently, im guessing so with the wording "Now And Then" also when your coming to a junction/roundabout and the Speedo has gone to Zero, do you feel a decrease in power around 10% and dipping the clutch and braking causes the Red Warning light to flash top right hand side in the dash and the car wants to stall and or Cuts out?

I have this same Problem and Believe it could be the Speed sensor on the gearbox ( Around £30 on ebay that i have found) 50+ from ford Dealer.

My Quick fix to get the speedo back from zero this is what i have found works to make it come back It does not Totally fix the problem, it just makes it come back if the speedo has dropped again whilst Moving.

This normally stops it happening again until the next time the car is turned off or stood for a while I have noticed it happens More often when the fuel gauge is Below 1/4 and its been raining for some reason? so im thinking it might have a loose connector on the sensor and its getting wet? but have to get under to have a check.

try this to see if it works, it does for me and i have a V Reg Focus LX 1.6

------------------------------------------------------------------------------------------------------------

What to do when you notice the Speedo has gone Off .

1) turn the lights on and off then,

2) change DOWN a gear to 3rd, then UP to 4th then to 3rd again

3) and tap the Gear stick on the palm part with the palm of your hand quite hard and wiggle the Gear Stick left and right with dipped clutch in Neutral .

4) turn the main dipped headlights on and off again ( i found also if i have the Heater running it makes this happen so turn it on and off a few times)

5) if it is safe to do so, pull over and turn the car OFF leaving the key in the ignition and then back ON Within 10 Seconds, repeat 1) , 2) 5) again and repeat untill the Speedo Returns (normally within 2-3 mins of this procedure)

if anyone else knows how to fix it please Post any info :)

uni.ianjones@gmail.com

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