so do not know what my true spead when driving can anyone give this daft lady some advice please worried due to take long journey
2007-03-21 06:46:52 · 10 answers · asked by little flower 3 in Cars & Transportation ➔ Maintenance & Repairs
my car is a old serria saphire
2007-03-21 07:11:47 · update #1
You is not a daft lady to ask for help, but you is a daft lady if you don't fix it because the magistrate won't accept jumping speedos as excuses for having your picture taken by one of those nice yellow cameras. It's also an MOT failure point.
You may have a faulty speedometer but don't go replacing it straight away. It will be costly and awkward, you'll also have a wrong mileage on your new instrument.
The most likely reason is a sticky bowden cable. That's the cable that runs from your gearbox up to your speedometer head.
These cables have a rigid outer sheath (to which the screw connectors are attached) and a wire core that carries rotating movement from your gearbox to the speedo. It's similar in construction to a bicycle brake cable.
The wire core of this cable should rotate freely within its sheath and they're lubricated during manufacture to make that easy.
Some of these are not as good as others. After many years and several miles some of them 'dry out' and the inner core cannot turn freely. Although the gearbox is trying to make it rotate continuously the steel wire sticks momentarily to the sheath (the natural springyness of steel permits this), then it will free itself, then it will stick again and so on.
The result is a jerky movement at the 'top end' resulting a jumping needle.
Get someone to take the cable out (you'll need to remove the front of the dashboard anyway even if you're changing the speedo itself) and see if you can pull the core out. Grease it and put it back. If you can't do that buy a new one. If the core is rusty or the sheath is damaged then get a new one anyway.
It may be fiddly routing it through the clutter behind the dashboard, through the bulkhead rubbers and down to the gearbox but a hell of a lot cheaper than a speedometer head. If changing the cable doesn't cure it then you'll need a new instrument.
Good luck. :-)
2007-03-21 07:13:05 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Using a stern voice, tell it "If you don't settle down and quit jumping around, I'm going to give you a time out!"
Sorry, since you didn't say make or year or model, that's about all the advice I can give you. I don't know if it's mechanical or electronic, needle type or digital.
If it's one with a cable, it usually means the cable needs to be lubricated or replaced. If electronic, there is a sensor on the front tire(s) that can have a problem. Ask your mechanic.
2007-03-21 06:55:58 · answer #2 · answered by oklatom 7 · 0⤊ 0⤋
The problem is most probably a speedometer cable that needs to be lubricate. it is tricky to do it yourself but the cost of the graphite lubricant is very low. briefly you need to detach the speedometer cable from its connection to the read out gauge... it usually had a knurled plastic nut and a bayonet end that makes it easy to take out, then squirt the lube in and pull the cable towards you about two inches and push it back several times... turn it gently to see if it reseated at the other end while you hold gentle downward pressure... push the bayonet back in to the back of the housing and re tighten the nut... takes about fifteen minutes if youre handy.
2007-03-21 07:02:39 · answer #3 · answered by don t 2 · 2⤊ 0⤋
depending on the vehicle and what type of speed sensor it has, there could be a few things that could cause it. if its a cable driven system or electronic sensor. some transmissions have a plastic drive and driven gear that can wear down. cable systems can become dry and bind giving a jumping needle affect. electronic sensors could start to fail and read improper. the worse case scenerio would be that the speedometer head unit is starting to fail requiring repair or replacement.
2007-03-21 06:52:48 · answer #4 · answered by Anonymous · 3⤊ 0⤋
Two causes.
1. Not enough lubricant within the speedo cable (makes it stick, turn, stick, turn).
2. Worn plastic gears in the gearbox.
Both are relatively simply to fix.
2007-03-21 08:39:14 · answer #5 · answered by Anonymous · 0⤊ 0⤋
possibly your speedo cable is worn or a bit loose,go to a garage to get checked out,im not being funny when i say take a bloke with you as some garages will tell a woman its somthin else and charge you the earth,a bloke can watch as they check it out,good luck
2007-03-21 06:58:28 · answer #6 · answered by Sugarlump 3 · 2⤊ 0⤋
this happened to me then my car conked out. i needed to replace the alternator. problem solved. take it to a reputable garage and get it checked out. I'm not a mechanic, only the voice of experience.
2007-03-21 07:13:54 · answer #7 · answered by val f1 nutter 7 · 0⤊ 0⤋
stop bye the auto shop.
do not take the car in.
Just ,an inocent trivia conversation....with the mechanic
2007-03-21 06:51:35 · answer #8 · answered by Anonymous · 1⤊ 0⤋
i jump up and down when im wearing speedos too
2007-03-21 06:50:24 · answer #9 · answered by Anonymous · 0⤊ 4⤋
Where a normal bathing suit........Speedo's are so EuroTrash....LOL
2007-03-21 06:51:12 · answer #10 · answered by ranger0186 2 · 1⤊ 4⤋