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I am getting no timing advance under load but when in neutral it gets full advance, there seems to be something telling it not to advance

No codes are set and is not going into forced reduction this engine ran fine 3 weeks ago I am simply lost without it setting a code.

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Ignition advance depends on several things happening. When in neutral there is high vacuum which sets the spark advance accordingly to be right for the mixture at the rpms
under load there is low or no vacuum so the mixture is different which requires a different timing setting
It was always known as timing advance on distributors but in many cases the ignition timing was actually retarded according to vacuum and rpms requirements.
If there are no codes being recorded then the electronics are doing their job.

Posted on Apr 02, 2015

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