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Old 07-22-2012, 04:01 AM   #1
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Default speedometer reads 140mph when im going 70mph?

exactly what the topic says. I already searched and found different answers on this problem i am having. someone said its the magnet in the speedometer and others say to just buy a new cable. does anyone have a real answer on this issue, i cant be the only one who had this mechanical problem. So, ya like no matter what my speed is, its like the speedometer is x2 the speed that i know i am going. someone please help me, this is driving f**king crazy!!!
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Old 07-22-2012, 10:04 AM   #2
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Is the odometer affected too?
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Old 07-22-2012, 10:44 AM   #3
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what year car?
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Old 07-22-2012, 03:19 PM   #4
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its a 1990 i just bought a few days ago. odometer doesn't appear to be affected from what i can observe because i calculated how far i drove last night and it seemed fairly accurate.
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Old 07-22-2012, 03:23 PM   #5
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speedo is mechanical cable. but unless the digital conversion in your cluster is fubared...
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Old 07-22-2012, 04:45 PM   #6
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its definitely the old crappy mechanical setup from the factory. what do u think it could be braineack? because i'm guessing it the problem lies in one of three areas: 1.cable, 2.speed driven gear, and 3.gauge cluster
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Old 07-22-2012, 05:10 PM   #7
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Car is seriously fast. You should make some youtube videos for us, showing the speedo.
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Old 07-22-2012, 09:21 PM   #8
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lol not funny, but ya it would be funny video
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Old 07-22-2012, 09:28 PM   #9
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1. Take video of 0-140 (indicated) mph run.
2. Post video on CR.net.
3. Sell car on CR.net.
4. Profit!
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Old 07-22-2012, 11:25 PM   #10
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In for the 60mph on 1st gear.
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Old 07-23-2012, 12:08 AM   #11
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tell everyone its LS1 swapped
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Old 07-23-2012, 12:27 AM   #12
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lol omg you guys are serious huh? well that still doesn't solve my problem with a half broke speedo. maybe on my way to work tuesday i will make a video.
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Old 07-23-2012, 12:28 AM   #13
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its not a common problem. I don't think anyone even knows how to help you short of telling you to get a new speedo cable and cluster
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Old 07-23-2012, 01:01 AM   #14
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D**n! I didn't wanna hear that. guess I will be buying both to make sure I fix the problem. Might as well buy the European kilometer style LHD face gauge cluster while I am at it, just so I feel satisfied that I will be installing something different then just plain jane replacement part.
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Old 07-23-2012, 01:20 AM   #15
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Well seeing the odo is not broken then i don't see a reason why it would be the speedo cable.
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Old 07-23-2012, 02:56 AM   #16
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okay so this is what i discovered. I also have a airbag diagnostic module that needs replaced because the airbag light flashes 10 times...so I crawled under the dash and found the larger of the two baby blue modules, lol it says Ford real big on it of course, then i decided to locate my speedo cable and once i did i gave it a very light tug and the darn thing came right out from the cluster as if it was never connected all the way. I looked inside the plastic coupler and all i see is a plastic rectangular peg, is there something else that is suppose to be there? I mean come on a little plastic peg turns the speedo?
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Old 07-23-2012, 03:18 AM   #17
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took some pics



Attached Thumbnails
speedometer reads 140mph when im going 70mph?-375723_2268708774882_1483609587_n.jpg   speedometer reads 140mph when im going 70mph?-391719_2268709934911_1302261109_n.jpg   speedometer reads 140mph when im going 70mph?-418633_2268710214918_1724977147_n.jpg  
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Old 07-23-2012, 09:45 AM   #18
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yep, the speedo gear in the trans spins that.

does your speedo bounce/shake at all?

it guess it's possible you have the wrong gear installed in the trans, i dont see how the cluster would double the speed, i think it's still mechanically linked, but I know the signal is converted digitally IIRC.
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Old 07-23-2012, 09:59 AM   #19
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Quote:
Originally Posted by Braineack View Post
it guess it's possible you have the wrong gear installed in the trans, i dont see how the cluster would double the speed, i think it's still mechanically linked, but I know the signal is converted digitally IIRC.
Whats more screwed up is that he says the odometer reads correctly. Isnt the odo mechanically linked to the speedo as well?

My 2c is the speedo it self is fucked.
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Old 07-23-2012, 10:01 AM   #20
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yeah, which is why my speedo bounces, because the cable is fubared. but I was able to smooth out the routing of it and got it to at least not make any noise.
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