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Old 12-27-2007, 12:51 AM
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Speedometer problems

Hi im new to the Forums.

I have a Manual '87 Prelude 2.0Si and half of the time my Speedometer works then drops to zero and other times doesn't work at all, the Tachometer works fine same with the Odometer. Can anyone tell me if its the Speedometer cable or the head of the Speedometer ?

Last edited by I CrazyFox I; 12-27-2007 at 01:12 AM.
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Old 12-29-2007, 01:21 AM
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Mine does it too, it seems to be a common problem among 2gs.

The cable needs to be replaced or regreased. i say replace it.
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Old 01-01-2008, 01:29 PM
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chances are its the speedo cable..check where it fits into the gearbox..it may be loose or damaged if u cant figure it out just replace the cable. I did a 3rd gen auto to manual tranny swap and had the same problem..in the end i just got the speedo cable out of the old loom and rewired it myself..its not a surefire fix but may be the cheapest..next option could be an auto electrician or the dreaded arse ripping dealership

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Old 01-02-2008, 04:26 PM
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why do people keep saying, 'its the speedo cable'? pull the ebrake up a click next time i just quits working, just to see. its a lose ground or something. wierd. just try it and tell me if that makes it work again.
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Old 01-03-2008, 02:10 PM
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Quote:
Originally Posted by Prelude85 View Post
Mine does it too, it seems to be a common problem among 2gs.

The cable needs to be replaced or regreased. i say replace it.
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Originally Posted by R8GYY View Post
chances are its the speedo cable..check where it fits into the gearbox..it may be loose or damaged if u cant figure it out just replace the cable. I did a 3rd gen auto to manual tranny swap and had the same problem..in the end i just got the speedo cable out of the old loom and rewired it myself..its not a surefire fix but may be the cheapest..next option could be an auto electrician or the dreaded arse ripping dealership
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Originally Posted by hondalude86 View Post
why do people keep saying, 'its the speedo cable'? pull the ebrake up a click next time i just quits working, just to see. its a lose ground or something. wierd. just try it and tell me if that makes it work again.
No i've tried pulling the e-brake already, im just gonna mess with the Speedo Cable and see if that fixes the problem and if not ill see if its the SpeedoMeter, and hopfully its one or the other and not the Speed Sensor on the Transmission.

Last edited by I CrazyFox I; 01-03-2008 at 05:16 PM.
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Old 01-03-2008, 03:16 PM
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does ur speedo suddenly jump back up and start working again after a little while or does it stay dead until you have been parked up for some time?
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Old 01-03-2008, 05:06 PM
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Originally Posted by R8GYY View Post
does ur speedo suddenly jump back up and start working again after a little while or does it stay dead until you have been parked up for some time?
It doesnt work most of the time, then all of a sudden it will work and then I slow and gear down it will drop to Zero and it only works 15% of the time. Like I said my Odometer, Tripometer and Tachometer work fine as far as I can tell.

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Old 01-03-2008, 05:09 PM
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i had exactly the same prob..i just replaced the speedo cable..it should be a blue one which runs from the sensor in the gearbox..chances are it may be rusted or broken in some places..
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Old 01-03-2008, 06:06 PM
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Icon5 could be the circuit board

I have the same problem in my '85 SI (manual). Like a previous poster, cracking the handbrake enough to light up the handbrake light also kicks the speedo back in. Before I discovered that, I'd bang on the console and sometimes it would "wake up". In my case I really think it's the printed circuit board, and lighting the emergency brake light gives juice to the speedometer.

If it was the cable feeding the assembly how could the odometer still work?
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Old 01-03-2008, 06:34 PM
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Quote:
Originally Posted by jonwz View Post
I have the same problem in my '85 SI (manual). Like a previous poster, cracking the handbrake enough to light up the handbrake light also kicks the speedo back in. Before I discovered that, I'd bang on the console and sometimes it would "wake up". In my case I really think it's the printed circuit board, and lighting the emergency brake light gives juice to the speedometer.

If it was the cable feeding the assembly how could the odometer still work?
I never thought about the Printed Circuit Board, I was looking at repairs and taking apart my Dash Cluster but you maybe right about the Printed Circuit Board being the problem.
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Old 01-03-2008, 06:42 PM
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just to be certain...

... just wanted to check - when you "cracked" the parking brake, did you engage it enough to light up the emergency brake light? As I said, that's what bypassed my problem, I have the brake cables set very high so that lighting the dashboard light is *waaay* before any resistance is applied to the rear brakes through the emergency brake cables.

The gen 2 preludes are great, but they do have their congenital problems (I'm on my ga-zillionthed AC compressor....:(
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Old 01-03-2008, 06:47 PM
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Quote:
Originally Posted by jonwz View Post
I have the same problem in my '85 SI (manual). Like a previous poster, cracking the handbrake enough to light up the handbrake light also kicks the speedo back in. Before I discovered that, I'd bang on the console and sometimes it would "wake up". In my case I really think it's the printed circuit board, and lighting the emergency brake light gives juice to the speedometer.

If it was the cable feeding the assembly how could the odometer still work?
there are different cables going to the cluster. the blue one that i mentioned is the one for the speedo and does not rely on any of the other wires to function. only prob being is the speedo is used more than any of the other dials and due to moving parts i.e speedo sensor motor (in the gearbox) has more current flowing through this wire and therefore causes it to wear out quicker than the others..but your prob could be a combination of probs and not just neccesarily the speedo cable and requires the process of elimination
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Old 01-03-2008, 06:50 PM
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Quote:
Originally Posted by jonwz View Post
... just wanted to check - when you "cracked" the parking brake, did you engage it enough to light up the emergency brake light? As I said, that's what bypassed my problem, I have the brake cables set very high so that lighting the dashboard light is *waaay* before any resistance is applied to the rear brakes through the emergency brake cables.

The gen 2 preludes are great, but they do have their congenital problems (I'm on my ga-zillionthed AC compressor....:(
Well the only time that it works with the Parking Brake is when its pulled fully and then released then I accelerate in first gear. I know it sounds weird but I have never heard of something like this.
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Old 01-03-2008, 06:56 PM
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Originally Posted by R8GYY View Post
there are different cables going to the cluster. the blue one that i mentioned is the one for the speedo and does not rely on any of the other wires to function. only prob being is the speedo is used more than any of the other dials and due to moving parts i.e speedo sensor motor (in the gearbox) has more current flowing through this wire and therefore causes it to wear out quicker than the others..but your prob could be a combination of probs and not just neccesarily the speedo cable and requires the process of elimination
Yeah thats what im gonna do just try all the different posible problems and see what happens and thanks to all of you for your help.
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Old 01-04-2008, 02:33 PM
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Quote:
Originally Posted by R8GYY View Post
there are different cables going to the cluster. the blue one that i mentioned is the one for the speedo and does not rely on any of the other wires to function. only prob being is the speedo is used more than any of the other dials and due to moving parts i.e speedo sensor motor (in the gearbox) has more current flowing through this wire and therefore causes it to wear out quicker than the others..but your prob could be a combination of probs and not just neccesarily the speedo cable and requires the process of elimination
dude, our speedo dont have an electric output from the tranny like the newer gens do. purely mechanical until it gets to the dash. its an electrical problem. probly in the gauge cluster its self. maybe if you take the gauge cluster out make sure everything behind the gauge cluster is tight, maybe that will help. but i want to warn you, once you take the gauge cluster out, getting the speedo cable back on is going to be a serious bitch, so go a little at a time. say like unplugging the wires, and then try plugging them back in. you dont ness have to have the entire unit out to do that. once i finally get my electrical trouble shooting manual, i'll see what it says, but i'm sure its elextrical.
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Old 01-17-2008, 06:00 PM
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dude, our speedo dont have an electric output from the tranny like the newer gens do. purely mechanical until it gets to the dash. its an electrical problem. probly in the gauge cluster its self. maybe if you take the gauge cluster out make sure everything behind the gauge cluster is tight, maybe that will help. but i want to warn you, once you take the gauge cluster out, getting the speedo cable back on is going to be a serious bitch, so go a little at a time. say like unplugging the wires, and then try plugging them back in. you dont ness have to have the entire unit out to do that. once i finally get my electrical trouble shooting manual, i'll see what it says, but i'm sure its elextrical.

Oh the bad luck, I just got my Speedometer Cluster on Tuesday opened the package and my luck the damn thing was poorly removed from the car it previously ocupide. The mounting area was broken and the face was cracked.

And yes it is a electrical problem, the plug that is for the speedometer sits loose in the back and i am trying to fix that problem
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Old 01-18-2008, 12:52 PM
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Icon10 Finaly My Speedometer is working !

Finaly My Speedometer is working, just lastnight the problem was found and was fixed. The part that was broken was very hard to track down but it was a no brainer once it was found. The part in question is the Speed Sensor on the back of the Speedo Cluster it self, yes thats right you heard me say Sensor on the back of the Cluster. Turns out that the part thats in the tranny isnt realy a sensor at all from what I can tell its more of a Speedometer Cable Driver, the Sensor is located in the little part behind the Tachometer where you plug the Speedo Cable in to the cluster and thats what was broken. So I replaced it, put the dash back together and it work perfectly and is still working. Thankyou all for you help in this manner.
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Old 01-18-2008, 01:06 PM
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Old 01-18-2008, 02:25 PM
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i'm glad that worked for yeah, as a matter of fact, i might see if that fixes mine! ah HA
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Old 01-18-2008, 07:34 PM
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Originally Posted by I CrazyFox I View Post
Finaly My Speedometer is working, just lastnight the problem was found and was fixed. The part that was broken was very hard to track down but it was a no brainer once it was found. The part in question is the Speed Sensor on the back of the Speedo Cluster it self, yes thats right you heard me say Sensor on the back of the Cluster. Turns out that the part thats in the tranny isnt realy a sensor at all from what I can tell its more of a Speedometer Cable Driver, the Sensor is located in the little part behind the Tachometer where you plug the Speedo Cable in to the cluster and thats what was broken. So I replaced it, put the dash back together and it work perfectly and is still working. Thankyou all for you help in this manner.
Glad to hear u got is sorted bro...well done
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Old 01-18-2008, 07:35 PM
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Originally Posted by I CrazyFox I View Post
Finaly My Speedometer is working, just lastnight the problem was found and was fixed. The part that was broken was very hard to track down but it was a no brainer once it was found. The part in question is the Speed Sensor on the back of the Speedo Cluster it self, yes thats right you heard me say Sensor on the back of the Cluster. Turns out that the part thats in the tranny isnt realy a sensor at all from what I can tell its more of a Speedometer Cable Driver, the Sensor is located in the little part behind the Tachometer where you plug the Speedo Cable in to the cluster and thats what was broken. So I replaced it, put the dash back together and it work perfectly and is still working. Thankyou all for you help in this manner.
Glad to hear u got it sorted bro...well done
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