7.4 Timing Tab

[67vetteal]

I'm stumped! 1997 TBI, Digital Ignition. On the timing cover there is no Degree Tab just a funny looking bracket looking thing where the Tab should be. :smt089 Damper has the line so what do I do to time my engine? Please/Thanks, Al W.:huh:

 

[PlayDate]

On TBI 454's the ignition timing cannot be adjusted the old school way (timing light). To insure proper alignment of the distributor, perform the following:

With the ignition OFF, hook up the scan tool.
Start the engine and bring to normal operating temperature.

Either read the Spark Advance numbers (easiest) or the Cam Retard Offset

Important: Cam Retard Offset reading will not be accurate below 1,000 RPM.

Increase engine speed to 1,000 RPM.
Monitor the Cam Retard Offset.

If the Cam Retard indicates a value of 0 degree + or -2 degree, the distributor is properly adjusted.
If the Cam Retard does not indicate 0 degree + or - 2 degree, the distributor must be adjusted.

-John

 

[67vetteal]

John, Thank you very much! I just serviced the internals on my Dist. and do not want to run the engine without it Timed properly. Thanks again, Al W.