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Old July 5th, 2009, 07:27 PM   #1
98redwrangler
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Default 98 TJ bad speedo after SYE install

Have read some of the other posts but mine might be slightly different. Before the SYE, speedo worked but showed slightly off because of going to 33 inch MT's. Went to a Rugged Ridge Mega Short SYE and custom drive shafts. Now the speedo shows nothing over 30 mph, needle jumps around, odometer shows .5 miles over a one mile course. Even after having the gauge cluster unit out while doing touch-up work, all of the other gauges work OK. This SYE has a magnetic speed sensor and plugs right into the wiring harness so there are no gears to play with. Have called Omix-Ada, makers of the SYE but their customer support is the engineering department and claim that the install shops do all of their trouble shooting, Omix-Ada didn't even have an old or new speedo sensor to look at, so no help from them. I put a new ground on the harness plug ( have had grounding issues in the past) but have not yet checked for the 5V output from the PCM. Maybe I could get 4WD to give an exchange on the sensor. Any ideas would be appreciated.
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Old July 5th, 2009, 07:59 PM   #2
mzy4v1
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The speed sensor on my Rubicon went bad, it uses a magnetic style sensor also. The needle was doing the same thing you described, especially the part about jumping around eratically.

I replaced the sensor and now everything is normal. I would try getting a new sensor.
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Old July 6th, 2009, 08:20 AM   #3
98redwrangler
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Thanks for the info, I was leaning toward changing the sensor since it was the major variable in the whole system. It's just a matter of 4WD calling it a defective exchange
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