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start here clean the line on the harmonic balancer and mark it with white out,so you can easily see it with a timing light.than clean the timing chain cover so you can see the degree marks it will say like 6420246 left is retarded and right is advanced,than there should be a sticker on the rad support saying what the timing should be set at for example it will say 8degrees with trans in park or neutral at idle, if its carbourated remove the vacuum advance hose from the distributer and plug it off so that the distibuter has no vacuum advance,if its fuel injected than you will have to disconnect what will be a purple wire in the main engine harness,this will be located on the left Sid eof the firewall if you are looking at the engine from the front of the vehicle.than start the engine and inspect the white line on the harmonic with the timing light,than simply move turn the distibuter until you can put that white line with the correspnding timing located on the rad support.once done so tighten the 9/16 bolt under the distibuter to ensure that it will not move.

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โˆ™ 2011-09-12 21:57:37
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Q: How do you set the timing on a 1986 Chevy truck with a 305 engine The engine backfires times?
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