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GMC Forum: How do you set timing on a '99 GMC Yukon 350 Vortec?
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Old 11-21-2010, 10:24 AM
Brant Bridges Brant Bridges is offline
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Default How do you set timing on a '99 GMC Yukon 350 Vortec?

Timing chain broke, I replaced & now cant get it back in time. I aligned the marks on the crank & cam shafts & still it's not in time. Can someone give me the step by step on the whole process including the distributor?
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Old 11-21-2010, 01:38 PM
Molson02536 Molson02536 is offline
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Quote:
Originally Posted by Brant Bridges View Post
Timing chain broke, I replaced & now cant get it back in time. I aligned the marks on the crank & cam shafts & still it's not in time. Can someone give me the step by step on the whole process including the distributor?
Before we get in to all that step by step, your going to need a scanner to time the Vortec. Without a scanner,your going to have a hard time timing your engine.

On the 5.7 Vorted you have, the distributor can be rotated unlike the 4.3 vortec's. The best way for you to try to time it to get your engine started is to rotate the distributor by hand till you get the engine started.

Once the engine is started, you then can go with timing it with a scanner. The timing is controled by the ECM from the crank and cam shaft readings, and with the engine steady at 1,500RPM. The engine should be times at 0" with the engine at 1,500 RPM steady with the use of the scanner's reading.

Good luck and hope this helps.
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