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Dynomite · 08-23-2012

New Secondary Port Throttle Vacuum System for 1990-1995.

See.......Post 234 - Installation of New Secondary Port Vacuum System hoses

This complete NEW vacuum system designed for the 93'-95' can be installed on a 1990-1995 ZR-1. For 1990-1992 this can be accomplished by substituting the longer Manifold Differential Pressure vacuum line on the original 1990-1992 ZR-1 Vacuum System for the shorter curled MDP Vacuum line in the New 93'-95' Secondary Port Throttle Vacuum System.

The New vacuum system connectors are New soft rubber and easy to disconnect connectors which are very tight (just twist the plastic tube back and forth and they will let loose). The Original hard rubber connectors are impossible to disconnect without cutting the connector lengthwise (with razor blade) to remove the plastic tube.

The Tee (T) was moved and a 1 inch long 1/8" Fuel Line PCV/EEC (SAE 30R7 obtained at O'Reillys) was used as a splice where the T was located.

The Stock MDP Vacuum Line was used and added to the New Secondary Vacuum System. I replaced the stock L fitting with the New L fitting removed when T was re-installed for the Drivers Side Secondary Canister.

In this case I also used the Stock line with New L fitting from the check valve to the Vacuum Pump line as that Stock line was just a bit longer

Went for a test drive with the 1990 and ALL is perfect

These New Secondary Vacuum Systems for 93'-95 which can easily be modified for 1990-1992s are offered on Ebay for $100 but one can buy them with an offer for less

New Secondary Vacuum System

Last UPDATE of post 9 Oct, 2022

08-23-2012	#9
Dynomite Join Date: Aug 2009 Location: South Dakota/California Posts: 3,788	New Secondary Port Throttle Vacuum System for 1990-1995 New Secondary Port Throttle Vacuum System for 1990-1995. See.......Post 234 - Installation of New Secondary Port Vacuum System hoses This complete NEW vacuum system designed for the 93'-95' can be installed on a 1990-1995 ZR-1. For 1990-1992 this can be accomplished by substituting the longer Manifold Differential Pressure vacuum line on the original 1990-1992 ZR-1 Vacuum System for the shorter curled MDP Vacuum line in the New 93'-95' Secondary Port Throttle Vacuum System. The New vacuum system connectors are New soft rubber and easy to disconnect connectors which are very tight (just twist the plastic tube back and forth and they will let loose). The Original hard rubber connectors are impossible to disconnect without cutting the connector lengthwise (with razor blade) to remove the plastic tube. The Tee (T) was moved and a 1 inch long 1/8" Fuel Line PCV/EEC (SAE 30R7 obtained at O'Reillys) was used as a splice where the T was located. The Stock MDP Vacuum Line was used and added to the New Secondary Vacuum System. I replaced the stock L fitting with the New L fitting removed when T was re-installed for the Drivers Side Secondary Canister. In this case I also used the Stock line with New L fitting from the check valve to the Vacuum Pump line as that Stock line was just a bit longer Went for a test drive with the 1990 and ALL is perfect These New Secondary Vacuum Systems for 93'-95 which can easily be modified for 1990-1992s are offered on Ebay for $100 but one can buy them with an offer for less New Secondary Vacuum System Last UPDATE of post 9 Oct, 2022 Last edited by Dynomite; 09-21-2022 at 02:39 PM.