Throttle Opener Check
- Complete "Dashpot System Check" as outlined above.
- By-pass the speed sensor by applying battery voltage to yellow/black wire at throttle opener solenoid connector.
- Raise engine speed to 3500 RPM and release throttle. Engine should return to idle in less than 6 seconds, but not faster than dashpot check time.
- If return time is less than check valve time, remove vacuum line from throttle opener solenoid valve to throttle control valve. Feel for vacuum at throttle opener solenoid.
- If vacuum is present, replace throttle control valve. If no vacuum, replace throttle opener solenoid valve. If return time to idle was more than 6 seconds, replace the throttle opener valve. After component replacement, retest system and remove jumper wires.