Question about 1989 GMC Sierra
Posted by Anonymous on
You have to disconnect the brown wire thats on the firewall. It disables the computer controlled advance and allows you to set the base timing. Disconnect SET TIMING connector (tan/black wire) located in harness close to distributor. DO NOT disconnect 4 wire connector at distributor.
Thank you for using fixya and good luck, set timing is O".
Posted on Jul 17, 2010
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Posted on Jan 02, 2017
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