Speedometer Problem

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Mar 6, 2009 | 05:36 PM

WaltB_FB92

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Junior Member

Joined: Feb 2007

Posts: 41

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From: Central Florida

Car: Pontiac Firebird

Engine: V-8 305

Transmission: Automatic 4-speed

Axle/Gears: non posi

Speedometer Problem

92 Firebird with a 700-R4 trani speedometer not working
changed speedo sensor and checked 10 amp fuse need
suggestion on other solutions.

Mar 8, 2009 | 04:01 PM

LT1-86

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Joined: Mar 2009

Posts: 38

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Car: 86 camaro

Engine: 96 LT1

Transmission: 400

Re: Speedometer Problem

i would do visual on all the wiring make sure you dont have a short or a open somewhere. did you clean up the connection up at all when you changed out the sensor? Did you just check the amp or did you replace it? did you check the connections at your ecu/ecm/pcm? then lastly i would check out the wiring behing the gauges.

Mar 9, 2009 | 01:49 AM

Kevin91Z

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Joined: Jul 1999

Posts: 10,950

Likes: 26

From: Orange, SoCal

Car: 1990 Pontiac Trans Am

Engine: 355 TPI siamesed runners

Transmission: Tremec T56

Axle/Gears: 12-Bolt 3.73

Re: Speedometer Problem

When you changed the speedo sensor (bolted into the tail shaft, right?) did you check to make sure the gear on the output shaft of the tranny was still there? Sometimes that internal one gets chewed up or comes off its stop and then the two speedo gears are not making contact any more.