Question about 1990 GMC Sierra
Posted by Anonymous on
Set it at 12 degrees btdc where it should be
If it has electronic timing it will advance /retard from that point and not as you expect to go to the correct setting
Posted on Mar 07, 2018
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Posted on Jan 02, 2017
SOURCE: 89 gmc
I time these engines at 4 to 6 degrees BTDC. If there is timing chain wear or if it has higher mileage, I go to 8 BTDC. The extra degrees help with the timing chain stretch.
Posted on Jun 20, 2008
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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