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Discussion Starter · #1 · (Edited)
I just changed my rear to 4.11 and I am showing 15mph off (more) which is normal after the ratio change...

I was thinking if I were to unplug the sensor (untill I get the correct speedo gear) would it affect the engine timing/computer ? or performance?

Does the on board computer use the speed reading to adjust the fuel etc?

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I have a 95 Wrangler (YJ 4.0, fuel injected. ) It does use the computer for timing.
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Thank you in advance..
 

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Don't unplug it. Just leave it plugged in.
 

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Discussion Starter · #4 · (Edited)
Ok.. it looks like the speed sensor does affect the performance. As soon as I unplugged engine would quit as I would come to a stop with gradual deceleration. No sputters, shaking nothing. RPM slowly goes to 0 and engine stop. Cant even notice it until you try to accelerate again.

I placed it right back.

P.s. It is a manual transmission
 

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Discussion Starter · #6 · (Edited)
Speed sensor ? were is it ? are u sure its a speed sensor - sounds like the crank sensor
yes, unless its called something else....

its on the transfercase

and well my speedo & odo stopped working.. what else could it be? :D

I think the YJ with FI uses it (maybe). My RPM goes to zero or very low (when the speedo sensor off) as I come to a stop. With the speedo sensor on, it does not go below 500.

Anyway.. mystery solved. At least on my YJ 95.


BTW... What does the crank sensor do? Timing?
 
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