Speedometer off by 10mph, what could it be?
 

I want to start off by saying, that I have a 1994 camry DX 5 speed, and its STOCK. the tires are the correct size, and I tried a different speed sensor and it did not change it a bit.

its around 6mph off around town, but the faster you go, the further it is off.

the odometer is also off by about a tenth of a mile every mile, so every ten miles I go, the odometer records 11 miles (nice way to rack up miles you didn't even drive!)

any ideas on what I should try next? I have had no luck searching online, so I take it that this is not a common problem.

RE: Speedometer off by 10mph, what could it be?
 

Is the trans the original?

RE: Speedometer off by 10mph, what could it be?
 

No speedometer is 100% accurate, and the faster you go, the less accurate it is. How do you assume it is off by 10mph ? I mean how did you gauge this ? The 10th of a mile is a lot easier to gauge with accuracy than exact speed. Yeah this isn't a common problem =/ . When did you notice this issue ? How long have you owned the car ?

RE: Speedometer off by 10mph, what could it be?
 

Yeah, gearing is a strong possibility. Getting more info on the car will help a bunch .

RE: Speedometer off by 10mph, what could it be?
 

I used a gps to measure the mph

RE: Speedometer off by 10mph, what could it be?
 

thanks to the issues with the forum, my 4 paragraph reply was erased before it even got a chance to get posted

RE: Speedometer off by 10mph, what could it be?
 

how do I tell if the transmission has been replaced? is there a serial number to look for? and if it is different would I need an ecu to match that? From what I have seen, the ecu is 1 unit, controls the engine and trans.

any help would be appreciated, I had more but the site is acting up on me, so I will keep it shorter, I am sick of typing!

RE: Speedometer off by 10mph, what could it be?
 

Yeah, that is a pretty accurate way. How long have you owned the car ? It seems to be something to do with the tranny/gearing because it's both the speedometer and odometer . What wheel and tire size do you have ?

RE: Speedometer off by 10mph, what could it be?
 

There serial number may be near the starter. It might give the year as a number and month as a letter, compare to your cars year.

RE: Speedometer off by 10mph, what could it be?
 

the tires are the stock size, I compared the size to the size it shows on the glove box lid and they are the same.

I have owned the car for 2 months, and its been like this since I bought it. the previous owner had a timing belt done, but really no other info on any other repairs.

so my car is a stock 1994 camry DX coupe 5 speed.

HERE IS THE transmission numbers I found near the starter.

hopefully someone can decipher this and shed some light on if the tranny is to blame, or the computer itself may be malfunctioning

40511492

hope that tells you something that is helpful!

RE: Speedometer off by 10mph, what could it be?
 

Can't find anything on this number.

There may a steel serial number plate riveted to the trans body, look on top of the diff housing.

You should be able to see it by looking down between the distributor cap and resontator box (the box is connected to and below the air intake tube going to the throttle body).

RE: Speedometer off by 10mph, what could it be?
 

WELL I think I know now what is causing this issue.

I bought the car about a month and a half ago from a nice lady in her 50's

the cluster says 137,000 on it

the carfax says it had 296,000 in 2004 so I think you know what happened, they did a roll back on it, and in the process, probably wrecked it.

also I had the car up for sale, I wanted to buy a motorcycle, and a guy called me and said he too looked at this same car when it was for sale last time, and he noticed a sticker on the timing belt cover that said 234,000 miles. conveniently , that was removed before I bought it.