![]() ![]() Restart the engine, bring it up to 1500 rpm and see what the new spec is. After you move the distributor, the ignition has to be cycled off to let the computer learn the new timing spec. You can move the distributor with the engine running but the timing will not change. If the timing specification is not within plus or minus two degrees of zero, you need to move the distributor. Start the engine, and bring it up to 1500 rpm. Connect the scanner and look for a data parameter labeled ‘cam offset’ or possibly ‘cam ******.’ It will be listed in degrees. A scanner is needed to properly adjust the timing. There is a timing mark on the balancer and on the timing cover for referencing Top Dead Center #1 cylinder only, but it is only used for dropping the distributor in to get the engine up and running. You can adjust this distributor, but there are no timing marks to watch as you move it. SOURCE: adjust timing on 1998 GMC K2500 pick up 5.7 liter
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