Join Date: Mar 2002
Location: Austin, TX, USA
Measure the resistance of the mixture solenoid. I don't know what the spec is. I'd guess somewhere between 8 and 30 ohms. If the solenoid is bad, it will most likely measure open. If you see some resistance there and no ticking, sounds like the computer isn't commanding the solenoid. You can back probe the solenoid with the ignition on. You should see somewhere between 1 and 4 volts on a DC volt meter. If not, start tracing back toward the computer.
Electrical connections are responsible for about 90% of the engine control problems in the early years. Check for broken wires, loose terminals and bad grounds also.
68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI