'93 speedometer ground issue?

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Jan 24, 2016
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I just replaced my power steering oil line and accidentally left the ground going to the intake manifold disconnected. I heard that this is for the speedometer, or affects it somehow. Once I heard that I hooked it back up, but the speedometer still doesn't work. What else should I check?
 
What I don't understand is why an engine ground would affect it, since the engine is grounded other places, and it seems it's just a frame ground. I thought maybe if I left it turned off awhile it might start to behave, but it hasn't seemed to.

Also, it seems to affect the overdrive putting the converter into lock and not unlocking it when I slow down so it kills the engine (at least I think that's what happening). Is there a fuse somewhere that could be having an issue?
 
How do you do that and will it break other stuff?

Disconnect the battery and let it sit for 5-10mins. Then reinstall. This resets the ECU.
 
Nope, this essentially just resets the computer to baseline. If its learned anything wonky that its trying to adjust for this will erase that out.

Btw - I dont know that this will fix your problem, but that's how you reset your ecu. On my '93 I can also pull my efi fuse.
 
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