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Many cars, few motors
Join Date: Sep 2007
Location: Pennsyltucky
Posts: 37
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Dead Speedometer
My speedometer isn't working, and neither are the trip or regular odometers. The MPG calculator below it works, but seems to be working in a funny way, either it pegs all the way at 60 or 0, depending on wether I'm giving it throttle or not, it never picks a value inbetween.
Could these two issues be related? Where do I start testing for the problem? I've replaced the tiny odometer gear before in a friends 944 when it's teeth stripped off due to age, but is there another thing that could cause this? I've already checked the connection to the transmission, since I had that out of the car for a clutch job, but it seems to check out. Car is an 86' n/a
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07-01-2008, 11:18 AM
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Registered
Join Date: Feb 2006
Location: Warrington, PA
Posts: 1,348
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Not a big speedo tech, but ill give you some suggestions. maybee a speedo cable, check you fuses, a bad relay. Also check to see if the ground is in place, and if you are getting power to the speedo.
Where in Pentuky do you live?
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Steve- If you havent looked, look- www.clarks-garage.com 87 951 red- Maria (current) 84 944 white- Percilla (current DD) 85.5 944 red- Pinta (past) 87 924S red- Nina (past) |
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07-02-2008, 08:23 AM
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Many cars, few motors
Join Date: Sep 2007
Location: Pennsyltucky
Posts: 37
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That would be in the State College area, dead center of the state
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-Trying for a Darwin Award since 1977 |
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07-02-2008, 10:50 AM
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Registered
Join Date: Jul 2001
Location: Suntree, Florida, USA
Posts: 2,261
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I have an 83 so it may be different... but, someone (me) might have accidentally forgotten to put the little retaining clip on the left front grease cap to hold the speedo cable in place once or twice (but who is counting).
Anyway, sounds like yours is different since you mention the trans. I just know that when I get know speedo or odometer readings at all it is because that little cable is no longer firmly attached and spinning around 
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JB - BreitWerks www.breitwerks.com 321-806-8664 Engine Rebuild & Restorations |
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07-02-2008, 12:08 PM
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Trying to work for parts!
Join Date: Oct 2006
Location: MO
Posts: 1,760
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Late cars are different then early cars. There is no speedo cable. it's all electronic.
Could be a few things. Check all your grounds and clean any that dont look shiny Could be the impulse sender/gear on the transmission. Easy to replace. Could be the wire from the impulse sender to the gauge cluster Last thing it could be is the gear I'm betting though it's one or a combination of the first 3. For me it was the wire between the impulse sender and the cluster.
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86 Metallic Grey 85.5 Metallic graphite - Gone |
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07-02-2008, 12:51 PM
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Registered
Join Date: Jul 2001
Location: Suntree, Florida, USA
Posts: 2,261
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Dang... you guys get all the cool stuff. Electric speedos, 16 valves, turbo chargers and I bet your A/C works well too!!! I am jealous.
Is there a relay or fuse that runs that circuit?
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JB - BreitWerks www.breitwerks.com 321-806-8664 Engine Rebuild & Restorations |
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07-02-2008, 01:24 PM
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Trying to work for parts!
Join Date: Oct 2006
Location: MO
Posts: 1,760
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Only fuse is for the entire instrument cluster. Wont be a fuse though since it works sometimes and sometimes it doesn't.
I wouldn't say it's cool stuff. It can be an absolute roayla PIA to track this stuff down when it's not working right. Mechanical is always better then electornic in my opnion. So much easier to troubleshoot....so that means it's cheaper to fix when it goes to the shop too.
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86 Metallic Grey 85.5 Metallic graphite - Gone |
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07-02-2008, 01:26 PM
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