Speedometer off in increments

[Zakkb787]

I have a 1993 cb7 5-speed with the stock f22 in it. It was my first car and I bought it from the guy that bought it new. I always thought that since I have bought it, I was going slower than everyone else. After passing a few speed detectors, I figured out why. When it says I'm doing 40, I'm going about 38. When I'm doing 50, it says about 45. Then it says 70, and I'm doing 62. I know the first thing I should do is search the forum. I did. I found nothing. So could this be my speed sensor? Gauge cluster? Please help. I drive 80 miles a day to work and cops are everywhere. I really really need this fixed.

[mtnbikaah]

what size tires do you have? if you have the wrong size it would cause the speedometer to be off...

[2doorhardcore]

could be tire size, could be speed sensor, what size rims are you running and might want to pull the speed sensor of and clean it. see if that helps..

[Zakkb787]

I have the stock size on it. 195/60/15 i believe. At times the speedometer will be right. It will actually jump back to the right speed sometimes.

[koslauj]

Check your speed sensor and get that sucker cleaned. If the speedle is correct and then it goes out and then jumps back to correct mph like you've mentioned, i'm almost positive its the speed sensor.

[Bad_dude]

Check your speed sensor and get that sucker cleaned. If the speedle is correct and then it goes out and then jumps back to correct mph like you've mentioned, i'm almost positive its the speed sensor.

Is this the speed sensor above the tranny or the ones by the wheels?
Thanks.

[dysfunk]

Speed sensor is located on the back side of the transmission.

http://www.cb7tuner.com/vbb/showthread.php?t=110686

[203CB7TUNER]

tranny sensor.

[reklipz]

Your numbers are all roughly equivalently proportional:

40/38 = 1.05
50/45 = 1.11
70/62 = 1.13


Your figures were guesstimates it seems, so I would say the electronics and mechanics are probably working just fine. I would chalk this up to worn tread, low tire pressure, or tires different in size from stock. :/

[dysfunk]

I would clean the sensor, considering you said that it'll be off, then it'll be dead even.

But, I want to know, what kind of shape are your tires in? Are you running the recommended air pressure in your tires? Tread wear? Lastly, can you confirm your tire size? I know that you said that you think they're 195/60/15.. but if they're a different size, even a 205/60/15 or a 195/65/15, it will make a difference.

[deevergote]

tranny sensor.

What's a "tranny sensor"?

[Straight Success]

What's a "tranny sensor"?

A sensor imbedded in a man's brain to allow him to correctly identify if the person standing in front of him is a man with tits. This way he doesn't make the mistake of pursuing sex with the same gender unless he's into that lifestyle. I'm not into that lifestyle, but I am aware that the speed sensor is what someone was hinting at.

[deevergote]

Ah yes. I hear tranny sensors made in Thailand may be faulty as well.

My post-whore sensor must be acting up again.

[Zakkb787]

The size is 195/60/15. They are brand new, less than 5,000 miles. they have the correct pressure in them, too. The old tires were the same factory size and it was off with them too. Like i said it is correct sometimes. It skips. so it is definitely the sensor?

[deevergote]

We can't say it's definitely anything... but that's most likely the case. Replacing it won't hurt. Even if it's not the issue, it's never a bad thing to replace a wear item before it fails. Plus, I'll be one more possibility ruled out.