Odometer jumps 10k miles?!

[88911coupe]

Did a search but can't seem to find this same issue. I just realized at some point in the last few days my car's (88 Carrera) odometer has suddenly leapt ahead by about 10,000 miles! Anyone ever seen this before? It appears to be working fine now and registering what seems to be the correct miles actually driven.
Tachometer and speedometer have been working as designed and I'd have noticed anything odd with them. I did have an issue about a year ago with a bad speedo gear which I replaced. I also found out back then that I have a 4 magnetic rotor for the sensor and not the more common 8 magnets. I don't think that is the issue since it was working fine otherwise.
Any ideas welcome,

[Mike80911]

Not sure why that happens but last month on a long drive the odometer on my 87 jumped 100,000 miles thank god I am not trying to sell it. I hope someone answers the thread and clears up what is going on.

[88911coupe]

OK...doing the mental math again, it was more like a 20,000 mile jump...from around 185,000 to 206,000. Still makes no sense. I could see a 100k jump due to one of the gears moving, but 20k?

[Driver_X]

Just to confirm, you are now in 2012, what year were you in last time you checked the odo? :-)

You didn't just install a flux capacitor did you?

[pete3799]

Talk about turbo lag.......

[wholberg]

Wow!!! You drive fast!

[88911coupe]

I keep all the bottles of oil I add and write down the mileage to keep track of the oil usage post rebuild. I noticed that I last added a quart at about in mid May with mileage of about 186,000 miles and now I'm at 206,000!!! I barely drive 800 miles a month...at most.
Somethings wrong...

[Ronnie's.930]

Do you have a teenage son?

[crustychief]

or use valet parking?

[88911coupe]

No kids, no valets ever, just two Welsh Corgies and they can't see over the bottom of the window...and I hide the keys from them.
Is is possible to "correct" an odometer by 20,000 miles and not damage it? It's not really an issue since I am keeping the car but it's bugging me that its wrong. I had it apart about a year ago to replace the gear and that was fairly painless but I obviously did nothing with the mileage.

[DW SD]

I'd suspect a broken or jammed gear within the gauge.

talk to north hollywood speedometer. They will fix it and reset it. Probably $100. They'll restore the gauge for a little more.

They did a great job for me.

Doug

[Chuck.H]

Originally Posted by DW SD

I'd suspect a broken or jammed gear within the gauge.

talk to north hollywood speedometer. They will fix it and reset it. Probably $100. They'll restore the gauge for a little more.

They did a great job for me.

Doug

+1, and then, so the gears don't break again, NEVER press the trip odo reset! After breaking two gears in my first 150k miles (while completely stopped and pressing gently), my last repair has gone 180k + miles with no failures!

HTH,
Chuck.H
'89 TurboLookTarga, 338k miles

[Smoove1010]

I'm glad to read that I'm not the only one - no valet, no Bueller... In the space of one tank of gas my odometer went from 99K and change to 299K and change! My candidate for full resto just became a parts car! Seriously - is correcting an odo a DIY job, or is this best left to the pros (who can update weak gears, etc., while they are at it?) Lastly, this doesn't see logical - how could this happen?
THX,
GK

[88911coupe]

OK...thanks for the recommendations but I've rebuilt my engine down to the crank...do I really need to send my odometer to NHS to correct the mileage? I may just take the thing apart again and, worst case scenario, send it to someone to change the mileage.

[spuggy]

Originally Posted by 88911coupe

OK...thanks for the recommendations but I've rebuilt my engine down to the crank...do I really need to send my odometer to NHS to correct the mileage? I may just take the thing apart again and, worst case scenario, send it to someone to change the mileage.

Don't know. but if you try it, post back and let us know how you got on - I need to add 231,000 miles to the instrument in the car now.

[group911@aol.co]

I wonder if any shop will alter the ODO readings?

[Chuck.H]

Originally Posted by group911@aol.co

I wonder if any shop will alter the ODO readings?

They altered mine - semi reluctantly but I wanted it accurate - when the odo broke, I roughly kept track of my miles and had them add them into the number, which they did.

Chuck.H
'89 TurboLookTarga, 338k miles

[E Sully]

It's not hard to change the mileage. Toughest part is prying the lip to open the speedometer up and recrimp it neatly. When I put the '86 3.2 engine and tranny in my 1973.5, I changed the broken gear on the electronic speedometer I bought, and while I was at it set the mileage to match the original mechanical speedo. I like to keep track of the actual mileage on the car, I even notified DMV of the speedometer swap when I registered it.

[ShakinJoe]

Drive backwards or a while

[FrenchToast]

Originally Posted by pete3799

Talk about turbo lag.......

Originally Posted by wholberg

Wow!!! You drive fast!

We've gone Plaid!

(from the movie Spaceballs)

Take care!