No speedo

On Mon, 10 Nov 2003 20:58:05 GMT, "Dennis Cox" shared the following:

Is there no cable involved here? I don't know how the new stuff works. It sounds like your cable just broke (if you have one) but... If the same thing happened to me with my '76 CJ I'd disconnect the cable at both ends and then spin one end of it and see if it spun on the other end, and I'd be shocked if it did. I dunno. Are the newer setups all electronic or something?

-- Travis

Dennis Cox did pass the time by typing:

In modern vehicles everything is related. Most signals flow through the computer before they go anywhere.

Did your engine stammer at all?

Anyhoo, remove, clean and replace the connectors to your Camshaft Position Sensor (located on the distributor) and the Crankshaft Position Sensor (located at 11:00 on the transmission bell housing). Also check and clean the connectors to your tranny and the battery terminals.

On Mon, 10 Nov 2003 15:05:51 -0600, "DougW" shared the following:

Wow. And it used to be as simple as a cable. :-)

-- Travis

travis did pass the time by typing:

Yep. How I fondly remember the mile upon mile of wintertime squeek squeek squeek squeek squeek squeek squeek until the speedometer cable in my C-10 Chevy finally warmed up.

Still have an adapter for my grease gun that's used to lube the cable. First time it got used I gave the gun a couple of good pulls and it filled up the speedometer. oops. Needle stayed put at 40 till I took the dash apart and degreased it.

Your tcase has a speed sensor inside that is merely a gear driven device that sends an electrical signal back to the computer that does whatever the computer does with this sort of stuff. Among the things the computer does is it sends it along to the speedometer which in turn displays the speed you are going.

My guess is the speedometer itself is the problem here. You can check though, try using the Cruise Control. If the Cruise works, the speed is being sent from the tcase. If the Cruise doesn't work, then the tcase speed sensor in the tcase should be examined.

To check the speed sensor, locate the tailhousing on the tcase, then move forward along the tailshaft housing until you find a wire or two that plug in. You can remove a single bolt and pull the sensor out. It has a gear on one end that might not be mating properly with its mate inside the tcase. The sensor is mounted on an ecsentric that is designed to accomodate different sizes of gears -- these different sizes are needed to offset optional tire sizes that Jeeps frequently have installed. My point is, the ecsentric can be turned to change the location with respect to the variouis gear sizes. If the ecsentric is not turned properly, the geras will not mesh and there will be no speed sensor output. If there is no speed sensor output, there will be no Cruise Control, or speedometer.

If the Cruise works properly, then you have lost the ground for the insturment panel, and if you look closely, other guages don't work right either.

Yes, the new ones are electronic.

On Mon, 10 Nov 2003 15:16:14 -0600, "DougW" shared the following:

heh heh Good story. Thanks for sharing. :-)

-- Travis

cruise control? This thang ain't got no cruise control. It's a Jeep, not a Honda or something. :-)

Thanks for the information CRWLR and you too DougW. I'll post what I find. Dennis

Your Sport has no Cruise? I thought Cruise was standard equipment ...

Dennis Cox did pass the time by typing:

Make sure you read Bills post. I forgot the bloody obvious, the dash connector your years TJ has is prone to having connection problems.

maybe not standard in 97. Of course, I've found many weird things about this 97 Sport that make me wonder if it was some reject off the assembly line.

"The sensor is mounted on an ecsentric that is designed to accomodate different sizes of gears -- these different sizes are needed to offset optional tire sizes that Jeeps frequently have installed. My point is, the ecsentric can be turned to change the location with respect to the variouis gear sizes. If the ecsentric is not turned properly, the geras will not mesh and there will be no speed sensor output. If there is no speed sensor output, there will be no Cruise Control, or speedometer."

If you've ever had the speedometer gear housing out, it's likely just not oriented properly as Jeff describes above.

Jerry

What if it was right on the hairy edge, then that edge broke off?

If you have been playing with the speed sensor because of resizing the tires or swapping the gears, then that is the place I would start my search. Loosen the bolt and reseat the sensor. You may need to rock the vehicle a little to get the gears to mesh.

good advice, I'll start there soon. Thanks, Dennis

A speedo right on the hairy edge? Too much information! :)

DAve