Speed o meter problems - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 22 (permalink) Old 02-07-2014, 10:49 PM Thread Starter
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Speed o meter problems

I just found out there isn't an obd port on my 1993 f350 7.3. All gauges work just fine, don't have a speedo. Any suggestions
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post #2 of 22 (permalink) Old 02-08-2014, 04:54 AM
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Re speedo

You have a connector under the hood but this is OBD 1,no help for speedo.Think you have a speedo cable,if so you can remove cable from peedo gear in trans and take a drill and spin cable while someone looks to see if needle moves up.if it's a electric motor for the speedo in the cluster,you will also have a speedo sensor in the transmission tail stock witch is a input signal for speedo motor in the cluster(dash).you can check plug for corroded connection on the speedo sensor.Question to help more,was the speedo bouncing or just quit.
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post #3 of 22 (permalink) Old 02-15-2014, 02:00 AM Thread Starter
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I missed your post, no cable on speedo and no PCM
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post #4 of 22 (permalink) Old 02-15-2014, 05:44 AM
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Re speedo

So if that's the case you then have a speed sensor at the rear side of the the transmission (tail stock).This sensor changes mechanical to electrical signal to the cluster speedometer.it could be one or the other.Question? Did the speedo just stop working or did the speed seem to fast compared to the speed you thought you were going.If so it sounds like the speedo in the cluster.Also check while driving if the odometer(mileage) is working.If not,it's the speedo in the cluster.If both speedo and odometer is not working,suspect speedo sensor in the rear side of transmission is at fault or electrical plug

Last edited by marc sanford; 02-15-2014 at 05:45 AM. Reason: Adding info
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post #5 of 22 (permalink) Old 02-15-2014, 10:50 AM Thread Starter
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The speedo and odometer both don't work at all. All gauges work. The sensor is in the rear end. I changed that.. By not having a PCM it is real hard. I am beginning to think that the speedo itself is bad. In the 92 and 93 are different setup than all the 7.3's. They are old school electronics
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post #6 of 22 (permalink) Old 02-15-2014, 03:26 PM
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Originally Posted by hobbieman View Post
The speedo and odometer both don't work at all. All gauges work. The sensor is in the rear end. I changed that.. By not having a PCM it is real hard. I am beginning to think that the speedo itself is bad. In the 92 and 93 are different setup than all the 7.3's. They are old school electronics
The sensor in the rear axle housing has nothing to do with the speedometer. It is the inductive pickup for the rear anti lock brakes if I remember correctly. The speedo is driven at the transmission output shaft as Mr. Sanford has referenced. There will be an electrical module and plug a few inches forward of the rear of the transmission on the left side tail housing. These do fail from time to time.

The question I seek an answer for is simply; why, or why not?
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post #7 of 22 (permalink) Old 02-15-2014, 03:28 PM Thread Starter
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Kool backslap, I will check it out, great news, thanks a heap
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post #8 of 22 (permalink) Old 02-15-2014, 08:07 PM
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Re speedo

If the guy that just replayed and had read my last post,I gave him the info required!!!!!!
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post #9 of 22 (permalink) Old 02-15-2014, 08:29 PM
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Originally Posted by marc sanford View Post
If the guy that just replayed and had read my last post,I gave him the info required!!!!!!


I did read your post.

BS

The question I seek an answer for is simply; why, or why not?
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post #10 of 22 (permalink) Old 02-15-2014, 10:13 PM
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Tks,Have a great weekend!
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