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Have 944, will restore
Join Date: May 2014
Location: Vermilion Ohio
Posts: 618
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Speedometer Randomly Cuts Out
Originally the speedometer and odometer on my 85.2 944 were not working. I traced the cause to a burned resistor on the speedometer's breadboard and found that the odometer gear was bad. I ordered the Armworx speedometer rebuilt kit and a new odometer gear and rebuilt the speedometer. It worked great for about 500 miles and then the speedometer and odometer would randomly not work. They would cut out five or so minutes into my drive and a tap on the dash would sometimes bring them back and sometimes not. Sometimes I would just have to wait and they would come back on their own. Now that the weather is warmer, they do not work at all initially and after a few minutes of driving they will randomly come back after a tap on the dash. Can anyone point me in the right direction on this or has anyone else experienced the same issues and found a cause?
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85.2 944 Guards Red M456 5spd 85 RX-7 Ocean Blue 5spd /80 RX-7 LS 5spd 84 RX-7 GSL-SE/ 88 RX-7 10th Anniversary 04 RX-8 Brilliant Black 6spd/ 04 RX-8 Nordic Green 6spd 84 Corvette 4+3, 93, 95 Corvette 6spd, 18 Camry SE |
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05-05-2015, 09:40 AM
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Registered
Join Date: May 2008
Posts: 1,701
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When my 85.5 showed the same symptoms, I found an effective and free fix by unclipping the speedometer sensor from where it attaches to the transmission case (driver's side, in the upper portion about mid-case), and giving the contacts a good cleaning. Has worked well since then.
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05-05-2015, 10:22 AM
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Have 944, will restore
Join Date: May 2014
Location: Vermilion Ohio
Posts: 618
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I appreciate the advice. I'll give that a try today!!
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85.2 944 Guards Red M456 5spd 85 RX-7 Ocean Blue 5spd /80 RX-7 LS 5spd 84 RX-7 GSL-SE/ 88 RX-7 10th Anniversary 04 RX-8 Brilliant Black 6spd/ 04 RX-8 Nordic Green 6spd 84 Corvette 4+3, 93, 95 Corvette 6spd, 18 Camry SE |
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05-05-2015, 11:21 AM
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Registered
Join Date: Feb 2003
Location: SF East Bay
Posts: 1,856
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Anyone have a 'scope waveform for the speedo-sensor output?
And how many pulses-per-rev it is? Thx |
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05-05-2015, 01:28 PM
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Registered
Join Date: Jul 2004
Location: Upstate New York
Posts: 3,261
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The speedometer pulses at 100 Hz for 60 mph. The rest is left as an exercise for the student.
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Good luck, George Beuselinck |
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05-05-2015, 02:10 PM
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