05-17-2015 | #1 |
Join Date: Apr 2015
Location: Kentucky
Posts: 363
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Clicking from this… what is it?
When the key is turned to electrics on, but prior to start, this clicks quite audibly ever 1.5 seconds. What is it, and is it supposed to make that sound? It's located under the hood up towards the right front facia of the '94 Z.
(BTW, Z manuals are on order!)
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'94 ZR1 LT5 - Dark Red Metallic '79 L82 4-speeds of fun '96 LT1 Borla, H-pipe, TB, CAI (Sold) "An adventure is only an inconvenience rightly considered. An inconvenience is only an adventure wrongly considered." -- G.K. Chesterton |
05-17-2015 | #2 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,664
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Re: Clicking from this… what is it?
Secondary vacuum pump. If its turning on every few seconds, you have a vacuum leak somewhere in the system.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
05-17-2015 | #3 |
Join Date: Apr 2004
Location: ATL. GA.
Posts: 2,162
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Re: Clicking from this… what is it?
Sounds like it is trying to cycle on once on it should run at least a few seconds. It is the vacuum pump for the secondary's. It may be repairable. Check out Dynomite's sticky's or I'm sure he will post up a link.
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Steve 1990 Steel Blue/Black #2355 1990 Red/Red #1473 1991 Quasar /Black #118 Sold 1991 Turquoise/Black #766 Parted Out 1993 Yellow/White #179 Sold 1990 Black/Gray #1361 Headers/4:10s Sold |
05-17-2015 | #5 | |
Join Date: Apr 2015
Location: Kentucky
Posts: 363
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Re: Clicking from this… what is it?
Quote:
The Z starts right up, idles great, runs smooth and like a beast. Appears to be all stock, 19k miles. Wasn't driven but 1,700 miles in the last 9 years. Narrow it down any?
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'94 ZR1 LT5 - Dark Red Metallic '79 L82 4-speeds of fun '96 LT1 Borla, H-pipe, TB, CAI (Sold) "An adventure is only an inconvenience rightly considered. An inconvenience is only an adventure wrongly considered." -- G.K. Chesterton |
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05-17-2015 | #6 | |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,788
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Re: Clicking from this… what is it?
Quote:
Checking for Vacuum Leaks TIPS Finding Vacuum Leak TIPS 1. Secondary Vacuum System The first photo shows details of the vacuum plumbing around the Secondary Vacuum Solenoid and Secondary Vacuum Reservoir Including the Check Valve. The second photo is the complete Secondary Vacuum System. The Check Valve allows plenum vacuum to be seen by Secondary Vacuum Reservoir but does not allow plenum to see Vacuum pump vacuum.
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Left Clickable links -Solutions- LT5 Modifications/Rebuild Tricks Low Mileage ZR-1 Restoration 1990 Corvette (L98) Modifications LT5 Eliminated Systems LT5 Added Systems LT5/ZR-1 Fluids 1995 LT5 SPECIFIC TOP END REBUILD TRICKS Last edited by Dynomite; 05-17-2015 at 08:59 PM. |
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05-17-2015 | #7 | |
Join Date: Apr 2015
Location: Kentucky
Posts: 363
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Re: Clicking from this… what is it?
Quote:
The rubber fitting appeared to be very lose, and I zip-tied it to hold the nylon vacuum line tighter, but no change in the 1.5s cycling of the vacuum pump. Must be the aforementioned leaky check valve? Great pics, BTW!
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'94 ZR1 LT5 - Dark Red Metallic '79 L82 4-speeds of fun '96 LT1 Borla, H-pipe, TB, CAI (Sold) "An adventure is only an inconvenience rightly considered. An inconvenience is only an adventure wrongly considered." -- G.K. Chesterton |
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05-17-2015 | #8 | |
Join Date: Aug 2009
Location: South Dakota/California
Posts: 3,788
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Re: Clicking from this… what is it?
Quote:
Vacuum Check Valve Make sure it is installed correct direction Unfortunately you have to remove Plenum to Replace Check Valve. |
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05-17-2015 | #9 | |
Join Date: Apr 2015
Location: Kentucky
Posts: 363
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Re: Clicking from this… what is it?
Quote:
Well, in the meantime… 1. Is there any problem with driving it for a bit before I do this? 2. What does that vacuum pump do for the secondaries before start? 3. Trying to keep it stock… for a least a month or two or three… and drive and enjoy it. But, what else should one check or replace when finally pulling the Plenum? Thanks for the tremendous help! G
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'94 ZR1 LT5 - Dark Red Metallic '79 L82 4-speeds of fun '96 LT1 Borla, H-pipe, TB, CAI (Sold) "An adventure is only an inconvenience rightly considered. An inconvenience is only an adventure wrongly considered." -- G.K. Chesterton |
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05-17-2015 | #10 |
Join Date: Jun 2005
Location: pittsburgh
Posts: 4,633
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Re: Clicking from this… what is it?
just replace every part you can.
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It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B" |
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