Anti-dieseling solenoid questions

[Stanco]

The solenoid has a high current draw and was powered by a 12 gauge pink wire connected to the ignition terminal of the fuse panel. Connecting it to the ignition coil is a bad idea.

The solenoid is part of the TCS system. In an effort to reduce emissions Chevrolet increased the mechanical advance in the distributor while reducing the initial advance. The TCS system shut down the vacuum advance until the transmission was in high gear. With the reduced initial advance they had to open the throttle more to get it to idle. This caused a dieseling problem on shut down hence the solenoid.

I removed my solenoid and recurved my distributor with 12° mechanical advance (24° at the crankshaft) + 12° initial for 36° total advance all in at 3200 RPM. I'm also running full manifold vacuum advance.

I also removed the rest of the TCS system including all the wiring. I used the 12 gauge pink idle stop solenoid wire to power the Petronix module I installed in the distributor. This large pink wire is controlled by the ignition switch and was perfect to power the Petronix module. The truck idles and runs much better with this tune.