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JFairman JFairman is offline
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Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
I think you're 100% right Mark.

The little mechanical thermo valve down under the airflow meter housing is in the vacuum advance line to block vacuum advance when the motor is cold and during the early part of warmup so the timing is not advancing much and exhaust temperatures are therefor higher and heat up the catalytic converter on 1986 and later USA cars faster, making it do it's EPA thing sooner.

The centrifical advance is still working all the time and it has to or the car would be an unbearable slug below 3500rpms when cold.
Old 04-05-2010, 12:38 PM
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