Bouncing Speedo?
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Junior User
Joined: Dec 2009
Posts: 50
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From: Big Rapids, MI
Bouncing Speedo?
The title pretty well describes it. Noticed a few months back my speedo bouncing a little. It's grown progressively more pronounced along with my level of concern. To be clear I'm not referring to the tack or cps issues. Anyone know what could be causing this? With a magnetic pickup in the diff and an electronic cluster I don't have a clue where to start......and I don't want to start along side the road after something's died and I'm stranded. 
Thanks in advance!
Thanks in advance!
Hotshot
Joined: Aug 2006
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Hotshot
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From: Newport, WA
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Post Fiend
Joined: Apr 2004
Posts: 12,835
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From: Silver Lake Dunes, MI
Could be but start with the easy stuff! Pull the VSS and clean any rust off the mounting. Wipe the sensor off and look close at the connector/wiring.
Hotshot
Joined: Aug 2006
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Rust on the mounting surface is a very good call.....
Hotshot
Joined: Aug 2006
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It keeps getting worse over time ....
Logistics Pro
Joined: Jul 2001
Posts: 4,137
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From: Marble Falls, Texas
Pull the speed sensor on the rear axle and clean it. But while it's out.....here's the kicker. Have the rear end up on jack stands and have someone slowly spin the wheels while you look at the tone ring with a flashlight. Make sure there are no teeth missing or chunks gone. If there is.....there's only on thing that causes that and that's broken differential parts. So if the tone ring is okay, reinstall the clean sensor and breath a sigh of relief. Then start looking up the line if the speedo still jumps.