Question about 1999 GMC Jimmy
The timing will need to be set with a scanner, look at CMP offset , set to "0"
Posted on Jul 05, 2010
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Posted on Jan 02, 2017
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Turn off the engine and connect a tachometer to the distributor per the manufacturer's instructions. Connect the timing light to the battery and then to the number one ignition wire. Start the engine and verify it's idling at 1,000 RPM. Adjust the idle speed if necessary
Point the timing light at the crankshaft pulley to determine the amount of adjustment needed. Adjust the timing by loosening the distributor mounting bolts and turning the distributor until the crankshaft timing mark lines up with the middle line of the timing light.
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