yajkenji

Like the title say will a speed sensor off a 96 miata work on my 92 miata???

Doppelgänger

iTrader: (12)

it will fit. But it depends on if the 96 it came out of had a Torsen LSD or not. Torsens had a 4.10 gear ratio that the sensor is calibrated to. But, if the car had a open diff. you'll be ok because ALL open diff. cars from 90-97 had a 4.30 rear gear.

Hope this helps.

olderguy

iTrader: (19)

Solomiata : Transmission : Ring and pinion tooth counts


The speed sensors, themselves, are interchangeable. The change from 4.3 to 4.1 rear on my 91 made the speedometer accurate but the odometer went off.

mrtonyg

iTrader: (1)

Funny, the link above doesn't show the 90-93 Miata RP which I believe was a 4.3 ratio.

Tony

olderguy

iTrader: (19)

That is strange. Maybe he didn't think to restate that all the first (89-93) models were 4.3 to 1

jsisco

iTrader: (7)

When you guys say speed sensor are you talking about the piece on the transmission or the circuit in the back of the speedo? I'm assuming your talking about the part on the transmission, because I was under the impression there wasn't an interchangeable part in the speedo.

Olderguy how did it change your odometer? Recently when I swapped in my 2000 engine I had trouble with the transmission, and found out the transmission had been swapped with a 89-93 car.

The reason I'm asking is, because I've had a CEL since I purchased the car for malfunctioning speed sensor. I've always figured it was the circuit in the back of the speedo, but I am curious now if the OBDII is thrown off by an incorrect reading from the gearing. Would that be possible?

yajkenji

ok i was wondering after i put in the speed sensor the speed gaugde will start working agian right?

olderguy

iTrader: (19)

I'm talking about the mechanical speed sensor in the transmission that feeds the speedo cable. Going to a 4.1 to 1 torsen on my '91 changed the actual miles vs. indicated miles since the odometer was set up for a 4.3 to 1 rear.

My speedometer had always read higher than actual and it just happened the the 4.1 to 1 rear corrected it to GPS. I could correct both by putting in a sensor from a '94 and adjusting the spring in the speedo, but it isn't worth the effort.

jsisco

iTrader: (7)

Assuming the speedo or speedo cable aren't the problem then yes it should work. Your speed will vary slightly from your actual speed. Check it with a GPS though to get an idea of how much.

Edit: although you asked if they are swappable if your speedometer isn't working it is more likely the speedometer cable.

yajkenji

ok let say it was the speedometer cable than wat should i do?

jsisco

iTrader: (7)

I've never actually tried this on a Miata, but I helped a friend do it on an old truck. If you disconnect the speedometer cable from the transmission there is a little piece that actually goes into the transmission that spins. It spins inside the cable all the way to the speedometer. My friend tested his speedometer cable by gently putting a drill on the part the goes in the transmission and then slowly spinning the drill. Then have someone looking through the window to see if the speedometer is working. You probably want to go really slow at first so you don't damage anything.

YMMV and I'm not responsible if you mess up a working cable.

If the cable is bad (ie doesn't spin the speedo) you just remove the gauge cluster and remove the cable from the back of the speedometer. Remove the old cable and run the new cable. Goes out the firewall and along the firewall. Then it goes down into the transmission tunnel. A haynes or other repair manual should give you some more direction if you don't feel comfortable with my replacement directions.

olderguy

iTrader: (19)

The unit that goes into the transmission has a gear that will shear off if the speedometer cable is binding in the casing going up to the speedometer. If the gear is screwed up, fix the cause before ruining another.