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Have one of these cars myself. The C-3 diagnostic lead is the ALDL mounted to the bottom edge of the dash just right of the steering wheel. You will need to insert a paperclip into the slot to ground terminals A and B to prevent the ECM from advancing or retarding the timing as you adjust the distributer. These are the same terminals you would ground to read the trouble codes.

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โˆ™ 2008-07-19 19:53:18
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Q: 1986 olds cutlass 307 auto set Timing auto zone says to jump ab on the diagnostic plug the label on the fan shroud says to start engine and ground C-3 diagnostic lead where is the C-3 diagnostic lead?
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