Cranks but wont start

One does not prevent the other. Rather, something in common to both systems stops them from working. Most commonly that is the crankshaft position sensor. Its signal tells the Engine Computer the engine is rotating. That is when the computer turns on the fuel pump. The crank signal is also needed to know when to fire an ignition coil. The place to start is by reading and recording the diagnostic fault codes.

It gets worse. I've been all over the wiring diagram and can only find two wires. The one on the corner that is black / white is the ground wire. That is terminal "A" and is normally the only corner wire that has one right next to it. Those two get connected together to read the codes.

The only other wire I found is orange and is the serial data wire from the Engine Computer. I can't even find a third wire. By comparing to a different year and model, I can tell you that orange wire is not the one to ground to read codes. Any chance there are some wires someone cut off and are hidden in there?

Hey David,

Here is a guide that should show you how to run the codes on it,

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Please let us know happens so it will help others.

Best, Ken