Engine limited to 5000 rpm 1990 ZR1 LT5

[Dynomite]

Originally Posted by DPZR1

Problem solved!!!

Thank you everyone!!

I put new actuators in and tested them!! But under hard acceleration one of the actuators wasn't holding vacuum, so I replaced everything in the secondary port vacuum system.

Runs great again!!!

I assume by actuator you mean vacuum canister.......

Originally Posted by Dynomite

Lets suppose when the Secondary Port Throttle Valve Solenoid opens it dumps vacuum into a completely failed Vacuum Canister (or vacuum lines between Secondary Port Throttle Valve Solenoid and Vacuum Canisters are completely disconnected/failed).....vacuum goes to zero. Once the Secondary Port Throttle Valve Solenoid valve closes vacuum builds up to normal.

The reason I revived this thread is simply because Jerry now has in stock NEW Secondary Port Throttle Vacuum (93'-95')

I have found that New Vaccum System lines and connectors will actually hold vacuum after you turn the key off and come back and check an hour later. It is amazing that the original hardened rubber Vacuum Connectors will never completely hold vacuum.

Jerry.....if you ever decide to build/obtain the NEW Secondary Port Throttle Vacuum System for the 90'-92'......let me know