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Young1 · 06-13-2021

Matt. It appears you are doing a careful diagnosis. Your actuators will not work if the vacuum solenoid for them has failed. It is Standard part number VS124. Common source of vacuum leak also. I have replaced 4 of them in the last five years in 3 different cars. The mounting brackets have to be cut off and screwed together because the original part in NLA. Be sure to do the test for actuator operation per Marcs website. His video IMO is worth it to perform your first plenum pull. Best of luck in keeping your beast alive.

06-13-2021	#5
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 901	Re: Source for secondary vacuum actuators? Matt. It appears you are doing a careful diagnosis. Your actuators will not work if the vacuum solenoid for them has failed. It is Standard part number VS124. Common source of vacuum leak also. I have replaced 4 of them in the last five years in 3 different cars. The mounting brackets have to be cut off and screwed together because the original part in NLA. Be sure to do the test for actuator operation per Marcs website. His video IMO is worth it to perform your first plenum pull. Best of luck in keeping your beast alive. __________________ Steve Young 1991 ZR-1 Quasar Blue Metallic/Black #729 Second Owner 1991 ZR-1 Dark Red Metallic/Black #2040 SOLD 1990 ZR-1 Dark Red Metallic/Saddle #1670 SOLD Double your happiness.....complain half as much.