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Old 10-10-2018, 04:44 PM   #1
PhysSDK2
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Default Speedometer Acting Up When Cold

Speedometer is dead...for the first few miles when it’s cold outside, then when the car warms up it pops to life. Capacitors, rear abs sensor, or something else? Also the cluster has been resoldered and I checked all the joints, they’re all good.
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Old 10-10-2018, 05:08 PM   #2
Rusty_ratchet
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What car? 94 940 T?
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Old 10-10-2018, 06:05 PM   #3
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Quote:
Originally Posted by Rusty_ratchet View Post
What car? 94 940 T?
Yes
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Old 10-10-2018, 06:57 PM   #4
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I smacked the dash behind the wheel for 2 years. Before I bought an eBay one
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Old 10-10-2018, 07:14 PM   #5
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Dont know exactly what type speedo you have, mine is a vdo and acted almost the same. It was the germanium diode which most likely got a little too hot during resoldering. My brother wired in a led near that diode and it was clear when it was and wasnt working.
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Old 10-10-2018, 09:48 PM   #6
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This is exactly what my speedo does in my '87 240. Always in the morning or at night when it's fairly cold out that my speedo shuts off mid drive until I smack it back to life. I already know the general speed according to gear and rpm, but it's still annoying because it takes the odo down with it and I like keeping track of miles. For sure it's probably a dying capacitor or bad solder in the speedo itself, all my wires are intact and clean.
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Old 10-11-2018, 02:27 AM   #7
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Yea mine’s a Yazaki cluster, I guess I’ll pull it once my other car’s out of the body shop and see if the caps are leaking or if I have any burned traces. Reading this faq the 91-92s had early issues but perhaps it’s only a matter of time before all electrolytic caps go bad including the 93-94s.
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