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post #1 of (permalink) Old 12-01-2002, 06:46 PM Thread Starter
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Dead \'92 speedo. Suggestions?

The speedo in my '92 Bronco is dead. All the other guages work fine. Just the speedo/ odo, don't work. The tranny (E4OD) is shifting fine, too. Is there any way to test the speedo? It's too expensive of an item to go trial and error.
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post #2 of (permalink) Old 12-01-2002, 07:12 PM
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Re: Dead \'92 speedo. Suggestions?

can you still read the odometer or is it gone completely?
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post #3 of (permalink) Old 12-01-2002, 07:40 PM Thread Starter
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Re: Dead \'92 speedo. Suggestions?

The odometer is blank. Nothing at all.
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post #4 of (permalink) Old 12-01-2002, 09:13 PM
 
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Re: Dead \'92 speedo. Suggestions?

the speedo reads off the top of your rear axle housing. there should be a two wire lead with connection that goes into your axle via a plug. i would check those wires to make shure there in good condition. the next step i would do is pull the cover and manually inspect the ring thats attached to the ring gear. ive worked on one 8.8 that the teeth had gotten screwed up on in one spot, and the abs malfunctioned(was a 90, so speedo didnt read off of it).
there is also a certtain air gap that has to be between the sensor and the ring. i dont have the spec off hand.
good luck tracing the problem.
Zach
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post #5 of (permalink) Old 12-01-2002, 09:22 PM
 
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Re: Dead \'92 speedo. Suggestions?

Don't go faster than traffic. [img]images/graemlins/grin.gif[/img] Or do what I did. Install 4.56 gears and you can't speed. [img]images/graemlins/shocked.gif[/img]
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post #6 of (permalink) Old 12-01-2002, 11:46 PM
 
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Re: Dead \'92 speedo. Suggestions?

If the tranny shifts fine and you get no check engine light the the sensor in the rear axle is fine. The dead odometer tells me that you got a bad PSOM or it has come unplugged. Check the codes and see if it gives you a code 533. Steve83 can sell you a PSOM for less than Ford. They aren't cheep but if you get a used one close to your mileage then it will be fine.
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post #7 of (permalink) Old 12-02-2002, 02:44 AM Thread Starter
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Re: Dead \'92 speedo. Suggestions?

Thank you. Great site, by the way! Now... electronics aren't really my thing. I learn about them, as I'm forced to. How do I get the codes? Do I get them from the EEC-IV test plugs, under the hood? I also found plugs behimd the pass side kick panel. I may be going junkyard diving, wednsday. If I can find an instrument cluster, what can I expect to pay? Can I just unplug the PSOM, rather than buy the whole cluster?
Sorry for all the newbie type questions. I've been running Jeeps, for a while and have let my Ford tech slip. Seems like I have some catching up to do! [img]images/graemlins/confused.gif[/img]
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post #8 of (permalink) Old 12-02-2002, 07:02 AM
 
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Re: Dead \'92 speedo. Suggestions?

My site tells how to get the codes from the under the hood connector.

You can get just the PSOM if they will let you seperate it out. I have seen broken clusters with a good PSOM go for as low as $40.
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post #9 of (permalink) Old 12-02-2002, 07:51 AM
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Re: Dead \'92 speedo. Suggestions?

I'd pull the original PSOM first and diagnose it. You might just have a bad ground or a cut power wire. It can't be the sensor in the rear end - I've tested my spare PSOMs by just powering them up with no sensor attached.
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post #10 of (permalink) Old 12-04-2002, 07:06 PM Thread Starter
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Re: Dead \'92 speedo. Suggestions?

OK... I just replaced the guage cluster. My guages are all nice and bright, now and all the guages work... except the odo. I haven't driven it, but I assume that if the odo doesn't work, the speedo won't either. What exactly does the PSOM look like and where is it? Is it inside the cluster? Anyone have a pic of it?
As for bad grounds or loss of power to it, are there any common trouble spots to look at?
Sorry for all the questions, but electrical just isn't my strong point. [img]images/graemlins/confused.gif[/img]
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