Vaccum solenoid switch - Page 2 - ZR-1 Net Registry Forums

whale · 12-07-2019

So there is a filter that goes on the 3rd port. That means there are only 2 vacuum ports or hoses that are used.

Z51JEFF · 12-07-2019

Quote:

Originally Posted by whale

So there is a filter that goes on the 3rd port. That means there are only 2 vacuum ports or hoses that are used.

I believe the filter goes on the silver nipple. In the picture the switch on the top is the early design,if you look on the switch you can see the small retainer for the flat filter. Can’t answer the questions a punt the port but my guess is one line in,one line out.

Corvette95 · 03-29-2020

Quote:

Originally Posted by Dynomite

Maybe four Solenoid Valves?

Vacuum Solenoid for early (90' under Plenum).
Vacuum Solenoid (filter) for Later (95' under Plenum)................Solenoid for Charcoal Canister (91'-95' under Plenum).

Solenoid located on Charcoal Canister (not shown) under Drivers Headlight (90').

Is the later 91+ adaptable to work on a 90 or is the 90 solenoid still available? Was going to replace it for maintenance purposes.

Young1 · 03-30-2020

Either will work. Later ones has a round filter earlier ones a flat filter. Put a new one in while you have the plenum off.
ACDelco 214-358 GM Original Equipment EGR Vacuum Regulator Solenoid Valve
$18.36 Prime FREE Delivery
Order it from Amazon.
Originals no longer available. Same valve. Different mount. You can swap out the mounts or cut each off and bolt together. I have done it both ways.

Corvette95 · 03-31-2020

Do you know the early (90) part # , I know it is discontinued.

G8nightman · 03-31-2020

Quote:

Originally Posted by Young1

Either will work. Later ones has a round filter earlier ones a flat filter. Put a new one in while you have the plenum off.
ACDelco 214-358 GM Original Equipment EGR Vacuum Regulator Solenoid Valve
$18.36 Prime FREE Delivery
Order it from Amazon.
Originals no longer available. Same valve. Different mount. You can swap out the mounts or cut each off and bolt together. I have done it both ways.

I have noticed the new ones not holding vacuum pressure did you test the new ones any issues?

A26B · 03-31-2020

Quote:

Originally Posted by G8nightman

I have noticed the new ones not holding vacuum pressure did you test the new ones any issues?

Agree. I ordered about 20 of them a couple of years ago and not a single one passed vacuum test. I disassembled one. If I recall correctly, the plunger seal looked like a piece of cardboard. I was planning to try to cut a piece of soft rubber to replace it.

Young1 · 03-31-2020

I installed one 3 years ago for myself and another 6 months ago for another car. Maybe I got lucky?

G8nightman · 03-31-2020

I ended up buying a used one that passed vacuum test

A26B · 03-31-2020

Quote:

Originally Posted by Young1

I installed one 3 years ago for myself and another 6 months ago for another car. Maybe I got lucky?

The SPT system doesn't require 100%, leak free vacuum. It can withstand slow leakdown better if both check valves and the vacuum pump are working properly.

Did you vacuum test the valve prior to installation? The ones I tested weren't a total bust but they weren't serviceable in my opinion.

12-07-2019	#11
whale Join Date: Jan 2005 Location: chattanooga, tn Posts: 27	Re: Vaccum solenoid switch So there is a filter that goes on the 3rd port. That means there are only 2 vacuum ports or hoses that are used.

03-30-2020	#14
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 881	Re: Vaccum solenoid switch Either will work. Later ones has a round filter earlier ones a flat filter. Put a new one in while you have the plenum off. ACDelco 214-358 GM Original Equipment EGR Vacuum Regulator Solenoid Valve $18.36 Prime FREE Delivery Order it from Amazon. Originals no longer available. Same valve. Different mount. You can swap out the mounts or cut each off and bolt together. I have done it both ways. __________________ 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.

03-31-2020	#15
Corvette95 Join Date: Jan 2006 Location: Decatur, AL Posts: 1,107	Re: Vaccum solenoid switch Do you know the early (90) part # , I know it is discontinued. __________________ Corvette95 Registry and Forum (*************) 1989 C4 Conv Wht/Gry Auto Hardtop Top Flight SOLD 1995 C4 Coupe Purple/Blk 6 Speed 1989 C4 Conv Wht/Red Auto SOLD 1996 C4 Conv Black/Tan Auto SOLD 1994 C4 Coupe Wht/Blk SOLD 1995 C4 ZR-1 White/Gry #278 Dual Dunn Head SOLD 1986 C4 Coupe Black/Red 4+3 SOLD 1990 C4 ZR-1 Red/Red #0454

03-31-2020	#18
Young1 Join Date: Sep 2016 Location: Ocala, FL Posts: 881	Re: Vaccum solenoid switch I installed one 3 years ago for myself and another 6 months ago for another car. Maybe I got lucky? __________________ 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.

03-31-2020	#19
G8nightman Join Date: Dec 2007 Location: NYC Posts: 1,182	Re: Vaccum solenoid switch I ended up buying a used one that passed vacuum test __________________ 90 Chevy ZR1 LPE #2315 'SOLD' 90 Chevy ZR1 LPE #2774 'SOLD' 91 Chevy ZR1 Callaway aerobody 91 Chevy ZR1 #1512 91 Chevy ZR1 #951 95 Chevy ZR1 #338 'SOLD' 91 BMW 850i 94 BMW 850csi 95 BMW 850csi 94 Lotus Esprit S4 07 Benz CLS550 06 BMW M5 "SOLD"