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Old 05-28-2012, 03:33 AM
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cobalt327 cobalt327 is offline
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Good info; '81 began ECM TCC control (unless CA possibly). Before then (like on my '80 Malibu wagon) it was analog, used a vacuum switch mounted on the fenderwell or firewall.

My engine doesn't use an EGR valve so I run manifold vacuum directly to the TCC vacuum switch and to the distributor vacuum advance, w/o the intake water crossover-mounted temperature switch. Using a temp switch wouldn't hurt, it would only prevent TCC lock up (as well as vacuum advance if that was also hooked through the switch) until the engine was up to temp.

Last edited by cobalt327; 05-28-2012 at 03:40 AM.
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