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Hi Ber, It would help a great deal to know what vehicle and the year of manufacture we're talking about. Modern vehicles use the speed sensor to actuate the gear change on auto boxes. take the vehicle for a diagnostic scan. Have the speedo repaired and you will probably have the vehicle back to being faithful again. Regards John
Sticks? Where? Zero miles per hour, or a value above that? The problem is likely the speedo "head", the part immediately behind the speedometer that makes it work. And if the speedo is not working right, the trans will not either. It might be worthwhile to have it "scanned" to see if the computer can identify the cause of the fault.
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 :)
I am no expert on this but have the same problem. Here is where I am at. I bought the truck used, needed a new PCM which after installing one from a gas job and verifying that wiring was good, bought a reman from Chrysler. Speedo still did not work even though it did with the gas PCM but was fluctuating allover. Chrysler replaced PCM and speedo started to work intermittantly. Took truck into dealer and $600. later told mechanic thought it was faulty PCM. He called Chrysler and asked them to pull one from the shelf and test. They said needed a new crankshaft speed sensor.Mechanic took truck on the road, shifted into nuetral then turned ignition back on, speedo works. Replaced crankshaft speed sensor and situation didn't change. Total spent $1000. and no speedo and no overdrive. Speedo started working intermittantly, seemed like depending on transmission temperature. Friend that works on dodge said is instrument cluster. tried another cluster still the same. Replaced ignition switch, thinking that may be the problem. Still the same. Bought a new Neutral starting switch, which I have not replaced as of yet. If I place truck in neutral and start the truck speedometer is activated right away but does not stay. So right now am down to two scenarios. The neutral starting switch or,...... the temp sensor in the oil line. Feeling is it is the neutral starting switch. By the way had already replaced speed sensor in tranny and rear end. Going to replace neutral starting switch, cost is $25. for the part and see what happens. Please keep us posted, as others are having the same problem.
I beleive you possibly have a earth problem on the engine and because of which the car tends to earth through the speedo cable causing it to get very hot and often melt the casing resulting in no speedo best to check all the earth straps on engine to body work for corrosion etc. if need be try using a jump lead off any steel bolt or fixing from the engine and put the other end on the body work and see if this works for the earth solution and regards to the speedo simply check th outer state of the speedo cable casing to see if its melted? you can allso remaove cable from gearbox end and spin using a hand drill or small low speed cordless drill to see if speedo then works?regards to the spring coming out? this is difficult to determine but maybe due to the over heating? so go through the above steps as the most important issue is the smoke/overheating which may have caused further faults.
I have a similar problem with the speedo needle which sticks at 0 occasionally. To get it working I tap firmly on the front of the instrument panel and it pops right up. I don't know the cause but it isn't a major issue. Try it.