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Don 'Mo Lurch'
Don 'Mo Lurch', Auto Mech / Electronics
Category: Chevy
Satisfied Customers: 20436
Experience:  Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
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gmc: ignition timing..find any marks on the timing cover

Resolved Question:

ignition timing on a 1999 5.7 gmc. i could not find any marks on the timing cover
Submitted: 7 years ago.
Category: Chevy
Expert:  Don 'Mo Lurch' replied 7 years ago.

Should be a Timing Guide on Cover like:





Scan Tool is needed for Ignition Timing.
Here is GMC procedure:





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