ECM CODE 61

[gorgeousgeorge]

I finally got the ECM CODE 61 with the method once Bob Saveland shown me(ALDL diagnostic port jumping) and my LT5 engine speed is limited to just 3000 rpm.

I have read the shop manual and now I understand that the CODE 61 refers to "Secondary Port Throttle Valve System". NOT a tiny work to fix..

I am suspecting "Secondary Port Throttle Valve Solenoid" failure or "Electric Vacuum Pump" failure. How would you think about this trouble? Is there any other cause concerning CODE 61?

Thanks in advance.

Yoshifumi Honda
91 Z
Nagoya, Japan