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Ignition Timing


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When adjusting ignition timing on a 218 using a timing light, is the vacuum line going to the vacuum advance left connected or is the line removed and plugged? Does the specification in the shop manual for timing at 0 degrees or 2 degrees BTDC include the advance from the vacuum advance at idle?

On some later model engines, the vacuum is disconnected and plugged when adjusting timing.


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These cars use ported vacuum developed within the carburetor for the vacuum signal. It should not be sending a signal at idle speeds, leaving it connected is not a problem.

You can also use a vacuum gauge hooked to the intake manifold (the vacuum wiper line is a handy spot on earlier Plymouths) The timing is adjusted to obtain the greatest vacuum reading at idle speed.

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