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Old 04-19-2007, 11:42 AM
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1987 chevy tbi timing?

First off i am working on a 1987 Chevy TBI 1/2 ton 4x4, with a 350 and turbo 350 automatic. Im gonna throw in that i have built this truck from the ground up and have learned alot about these old chevy trucks and pulled alot of information from these forums but i am again puzzled. I am having a driveshaft made currently so i cant do any seat of the pants testing on my timing. 1st question what should the timing be the sticker on the radiator support says the timing should be set at 0 degrees and i have a book that says 6 degrees. This is a stock Gm grate motor. Next question There is a Line on the harmonic balancer which is actually made into the balancer? Im assuming this is tdc? But There is also a Paint mark that the guy i bought the motor off put on the balancer. He also used the same paint to mark 0 degrees on the gauge. Ive never worked on any of the tbi's so any help or steps to properly set the timing on these tbi motors would be greatly apreciated. I did unplug the brown/blackstripe plug on the firewall before i tried to set the timing, but didnt reset the computer by unplugging the ground wire after to reset the computer when finished. Thanks in advance.

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Old 04-19-2007, 02:10 PM
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If it is a stock motor you should have to use the line on the balancer. The computer controled TBI motors are timed at 0*, and the computer takes readings from different sensors and adjusts as needed. When setting the timing with that wire unpluged it allows for it to be timed without "adjustment" from the computer. I set the timing ahead once because it ran a little better, but the problem is when the computer advances timing and it senses spark knock (from your knock sensor) it quickly retards timing to avoid damage. and this sudden change in timing greatly affects performance. So I would stick with 0*, especialy if that is what the vehicle sticker says (assuming the truck was originaly equiped with a 350).
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