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Old 01-25-2005, 05:41 PM   #9
GMMerlin
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Neither one of these engines can be "timed" in the way you are used too.
The distibutor housing holds the cam sensor, The PCM calculates the timing by measuring the crank signal and the cam signal.
What you are seting by turning the distibutor housing is the correlation between the 2 sensors.
On the V-6 model, the housing holddown bracket is fixed to the housing so if you return the rotor to the proper position when reinstalling the housing, the engine should be at the correct cam sensor position setting.
Believe me I have seen them installed incorrectly
I don't know why they did not fix the holddown bracket to the V-8 models, it would have saved a lot of headaches.

To set the correlation between the 2, you will need a scan tool that can read camshaft position offset.
With the engine RPM over 1200 adjust the offset too 0 degrees.
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