1991 Dodge Shadow 2.5L Speedometer Not Working

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  #1  
Old 04-05-08, 08:44 PM
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1991 Dodge Shadow 2.5L Speedometer Not Working

Just Wondering Where To Start Looking For Speed Sensor Output On Tranny.Or Should I be Looking For Other Things That Might Cause Speedometer Not To Work.
 
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Old 04-06-08, 08:59 AM
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I'd like to know the mystery myself. Neighbor and I have similar cars. Both of our cars have had the speedometer go out, and then either the same day, or days later they gave started working again, and STAYED working.

My car has done this twice so far, and the last time it was out, temporarily, was many months ago. My neighbor's just had it happen, and I told him about what mine did, and how it fixed itself. So did his then, in 2 days! Both are 2.5L 91's, also.

Borderline bad connection somewhere maybe? Don't know. Will be forced to look into this though if it ever goes out for good.
 
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Old 04-06-08, 09:29 AM
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Old 04-06-08, 10:33 AM
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I may be totally off track here but if you don't have the speedo cable that run from the dash to speed sensor behind the trans, the speed sensor itself may be bad.

If you have the cable that connected to speed sensor, first of, I would check the cable at the trans, you can get to it from the top without jacking your car up, remove the cable and check to see if it's broken, then you need to remove the speed sensor and check the drive gear to see if gera teeth are stripped out, if they both look OK and your speedo starts working again for some reason that you donot know, check the front engine/trans mount at the radiator support, I've seen them goes bad and when you on heavy accelerate, the eng/trans "jump" forward just enough to pull the speedo cable out of it place, then "pop" back after driving for awhile.

Just a though.
 
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Old 04-06-08, 10:58 AM
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Originally Posted by New guy View Post
if they both look OK and your speedo starts working again for some reason that you donot know, check the front engine/trans mount at the radiator support, I've seen them goes bad and when you on heavy accelerate, the eng/trans "jump" forward just enough to pull the speedo cable out of it place, then "pop" back after driving for awhile.

Just a though.
Interesting.

MY metal mount bracket is secure. To check the rubber mount itself I guess you'd need to see what happens by creating a torque situation by putting it in drive with your foot on the brake, and giving it pulsations of throttle, to see if the motor rocks to and aft? Does that sound like a plan?

The fact that the poster has this problem and both me and my neighbor on the same year and engine have had this problem, and the fact OUR two went away by itself (and note that when it went away, I mean away is in 'normal- again away', as the speedo needle does not even waver. It is rock solid. In fact it never wavered even when it went out.

You'd think if there was some connection issue, that every now and then the signal pulses would get weird and cause jumping in the needle. There is none of that. It went from working, to 0 mph, to fully working again, in an instant. And stayed that way. And maybe the poster's will also, as we all have the same year and engine.
 
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Old 04-06-08, 11:20 AM
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Originally Posted by ecman51` View Post
Interesting.

MY metal mount bracket is secure. To check the rubber mount itself I guess you'd need to see what happens by creating a torque situation by putting it in drive with your foot on the brake, and giving it pulsations of throttle, to see if the motor rocks to and aft? Does that sound like a plan?

.
Yes it's, the way we do it is one guy sit in the car, e-brake on, choked the wheels, put it in gear with left foot on service brake pedal and "tap" the throttle with right foot, the other stay on the side of the car and watch the engine "jumps", it shouldn't jumps more than 1/2 of an inch, try on both in Drive and in Rev. Be Very Carefull when working around a running engine even though there's a guy in it with foot on brake. Do Not stay in front of the car.
 
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Old 04-06-08, 11:24 AM
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Originally Posted by New guy View Post
Be Very Carefull when working around a running engine even though there's a guy in it with foot on brake. Do Not stay in front of the car.
It be funny to get my neighbor on this, and tell him that I thought it be best if HE be the one to stand in front of the car and watch, just to see what he says.
 
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Old 04-06-08, 08:11 PM
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well, here's a thought:
after you found your speed sensor, which should not be that much of a deal, losen up the mounting bolt and tilt sensor. which way to tilt? eyeball where driveshaft runs into tranny and titl it so that the inside end of it towards the driveshaft. then jamm it with something in that position. i drove for several mths with sock holding it in place like this.
or you can jackstand the front end, start it up, and simply put into drive or gear.
did your speedometer come back to life? then plastic gear on the sensor shaft is worn out and out of engagement with the driveshaft. tilting it simply re-enaged it. in my case, it cost me $9 for new warm gear and about 10 minutes to replace it. xxxxxxxx transmission in xxxxxxx alabama wanted $800 and 3 days "to remove trannie and replace driveshaft warm gear, that was probably worn out".
 

Last edited by carguyinva; 04-07-08 at 04:13 AM.
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