Question about 1993 GMC Sierra K1500
Ok, there is an earth wire between the engine and the body (usually bolted to the exhaust manifold), you need to undo it from the body, and with a piece of sandpaper or a file, you need to clear away the paint from under where the wire connects to the body, (might be a bad earth giving a faulty sensor reading, because on the production line the body is painted before anything else is fitted), clean the end of the earth wire contact and re-connect.
if you still have the same problem, you need to see an auto electrician or your nearest dealer.
Posted on Dec 03, 2008
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Posted on Jan 02, 2017
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