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speedometer wiring question by Apricot Punt
Started on: 07-13-2014 12:53 AM
Replies: 2 (100 views)
Last post by: phonedawgz on 07-13-2014 10:57 AM
Apricot Punt
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Report this Post07-13-2014 12:53 AM Click Here to See the Profile for Apricot PuntClick Here to Email Apricot PuntSend a Private Message to Apricot PuntEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hi all,

I've got an 88 GT I swapped a 327 SBC in with an Archie kit. Got everything working properly with exception to the speedometer. Speedometer will jump randomly up to 20 - 40 MPH and back down with the car stationary. Anybody ever seen this?

It tends to do it while reving the engine more so than just idling. Haven't been able to check if the speedometer functions while driving yet. I've tried a new speedometer sensor and did same thing. I did delete the cruise control, cut wires and shrink wrapped the loose ends. I did the same thing on my 87 GT that I previously had this Archie kit on, and all worked okay. I searched the forum and couldn't find the same symptoms that I have here. Next step I was going to check was to swap out speedometer gauge with a known good spare that I have. Any input appreciated.

thanks
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Bloozberry
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Report this Post07-13-2014 08:26 AM Click Here to See the Profile for BloozberrySend a Private Message to BloozberryEdit/Delete MessageReply w/QuoteDirect Link to This Post
It sounds like you've got either a faulty connection to the speedo gauge, a faulty gauge, or perhaps some electromagnetic interference being induced into the purple and yellow signal wires from the sensor, perhaps by running the sensor wires too close to something like ignition system components.
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phonedawgz
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Report this Post07-13-2014 10:57 AM Click Here to See the Profile for phonedawgzClick Here to visit phonedawgz's HomePageClick Here to Email phonedawgzSend a Private Message to phonedawgzEdit/Delete MessageReply w/QuoteDirect Link to This Post
I think I'd try driving it first before replacing more components
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