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The mkiv Supra Owners Club

Speedo conversion chip problems


Steviekid

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Hi everyone, I've just bought an Import Supra and have fitted a kph-mph/delimiter chip to the back of the speedo. It works fine except under hard accelaration when the speedo needle flicks up and down a lot. Once I settle on a speed it reads ok again. I've also noticed that it flicks about when you press the windscreen wash buttons etc when the ignition is on but the engine isn't started yet. All the connections are secure enough at the back.

 

Any ideas?!

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Hi mate, its a bad earth by sounds of it, i have very similar problem.

 

Speedo fine....turn lights on and it goes a bit nuts like urs or sometimes dies all together. So i have got a dodgey earth connection for Dash lights. Also if im sat with it idling and flick lights on...the needle *blips* is best i can describe it.

 

Dangerous Brain on here had same problem with old car, went funny or died under accelaration, was a bad earth on his too.

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