Question about 2001 Ford Focus

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When my friend drives her car, at times the needle in the speedometer goes very high suddenly, even thought the car does not speed forward. If the radio is on, the volume goes up suddenly too.

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A change in voltage from the alternator can cause this.
The most common cause is dirty battery terminals.
Take them off, clean and grease them, and put them back on.
They check with a voltmeter.
should be 12.5 at idle, and above 14 at high rev, but not over 14.5.
If over 14.5, then have alternator rebuilt.

Posted on Sep 13, 2010

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Posted on Jan 02, 2017

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I have a 1996 Honda Accord with 268k miles that sputters at the same timethe speedometer needle fluctuates wildly. But I do have a new Vehicle Speed Sensor. This typically only happens when the engin


I am no Honda expert, but a similar problem happened to my ex sister in-laws Ford Taurus. The speed odometer would jump around and it had trouble shifting (automatic transmission). After driving it I changed out the speed odometer sensor on the transmission and it's been fine ever since. I changed out the sensor because if the cars computer cannot tell how fast the car is traveling then fail safes in place go into effect and the computer will do it's best to keep the cars rpm's down based on the speed indicator and not let it shift or shift properly either. If it's getting false speeds then it will shut down the motor when the speed gets to high and allow it to run as the speeds fall (jumping speed odometer needle). It effects the transmission shift points also. It will either shift erratically or not shift out of say 2nd gear, so that the cars engine can't get damaged based on what signal the speed sensor is sending the computer.

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My speedometer goes up and down , and my radio goes on and off


The speedometer can fluctuate rapidly under normal driving conditions when the car's speed changes abruptly, but sometimes the needle can start swinging around the dial without any fluctuation in speed. If the hairspring comes loose or breaks, it can't hold the speed cup in place, and the result is a fluctuation in the dial. In electrical speedometers, if the circuit that counts the magnetic pulses fails, it can cause the speedometer read-out to vary from the actual speed and to shoot upward or downward without notice. If a speed sensor in the automatic transmission starts to malfunction, it can affect the speedometer and cause fluctuations. In these instances, either the speedometer or the sensor needs replacement.

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My speedometer stops working sometimes.


Find the speedo cable at transmission and see if it is loose.

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Speedometer jumps high sometimes and low


AUTOMATIC TRANMISSON HAS A SPEED SNSOR,CONTOLS SPEEDOMETER,WHEN IT GOES BAD THE NEEDLE GOES EVERYWHERE.

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I have an XJ6 1986 Jaguar, speedometer sometimes works


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2005 Chevy Impala speedometer


Replace the speed sensor, but also make sure you clear any codes, even if none are showing up, disconnect the battery for about 1 hour. After that drive it easy for a while, so it can relearn.

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1 Answer

I have a 1991 buick park avenue ultra


Speedometer or fuel gage?

If speedometer which is bouncing around, it is likely a bad ground near where the speed sensor wire harness (which connects the speed sensor to the rest of the "network") exits the transmission housing. It's at the very back of the transmission (you have a 4T60E trans) to the left of where the right side half-shaft leaves the trans housing. Just look for damaged wires. If none, replace the speed sensor for $50-60.

If it is the fuel gage, the sensor is probably not "zeroed"--it's reading wrong, too high, and if it were to start at true "empty", it would read right. Thus, the gage is always reading a little high (maybe a 1/8-1/10th of a tank too high?). This isn't a problem until to stop, start, or turn quickly and cause the fule to slosh around in the tank and starve the in-tank pickup which sends fuel to the engine.

If it is the fuel gage, you should simply put as much fuel in as you can and see if the needle goes far above "F". If it does, note how far it went and then practice filling the tank when the needle is that same distance above "E".

Hope this helps.

Sep 15, 2008 | 1991 Buick Park Avenue

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