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05-13-2018
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#1 |
 Join Date: May 2018
Location: Cypress, Texas
Posts: 27
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Vacuum leak
I have just purchased my 1990 ZR1 last month, which has just over 26,000 miles and I have a couple of problems to try to resolve. The first is a vacuum leak. I can hear the vacuum pump running from the time I turn the key until I start the car and don't know where to start to resolve the problem. I am not a mechanic but can do some basic repair work. Does anyone know where to get a diagram of the vacuum system on the LT5? I have noticed that there is a vacuum line off of one of the parts to the car that is located in the front right side of the car below the headlight. I can see where the vacuum line should be but I cannot find the line, nor do I know where it would go. The part that the vacuum line attaches too is made in Germany and has two numbers on it. One is 10098414 (near the top) and 003-953-06 near the bottom. This part also has an electrical connection going to it.
Thanks |
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05-14-2018
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#2 |
Join Date: Nov 2007
Location: Sunshine State
Posts: 1,071
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Re: Vacuum leak
Post some pics of your car in the general section!
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[B]1990 #2815[/B] [COLOR="Red"][B]Red/Red[/B][/COLOR] Ported Plenum & IH (by Pete) Haibeck Chip Rebuilt FPR (by Phil) FIC Injectors Watson LT Headers 3" Stainless Works exhaust Lingenfelter Open Air Lid Bill B Built Transmission Shifter & C Beam Plates [FONT=Impact][COLOR=red]1992 [COLOR=black]#[/COLOR] 091[/COLOR][/FONT] [FONT=Impact][COLOR=#ff0000]Red/[COLOR=silver]Gray[/COLOR][/COLOR][/FONT] [B]SOLD[/B] |
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05-14-2018
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#3 |
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Join Date: May 2018
Location: Cypress, Texas
Posts: 27
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Re: Vacuum leak
I have uploaded a picture of the part referenced above. It is located below the right head light. It can be see that there is no vacuum line attached to the lower, white, connector on the left side of the part. I have looked and cannot find any vacuum lines on that side of the engine that are not connected. My problem is that I don't know where the lines should go. The connection that is above the white one does have a line that goes behind the oil filter.
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05-14-2018
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#4 |
Join Date: Nov 2016
Location: Norway
Posts: 397
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Re: Vacuum leak
I believe that white connector is the outlet of the pump. The hose with the 90° elbow on the left in the photo is the hose that goes to below the plenum.
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- '90 ZR-1 |
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05-14-2018
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#5 |
 
Join Date: Jun 2006
Location: Sparks, NV
Posts: 2,852
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Re: Vacuum leak
That’s the vacuum pump. Does it stop running when you start the engine?
H
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90'ZR-1 #1461 Red/Black Ported Intake, Degreed Cams, OBX Headers & Exhaust, Fidanza FW, Secondary Delete, Custom tune, C6 GS Wheels. Sold 08 C6 Z51 Crystal Red Metallic Sold Vararam Intake, Tune, Sold 05 C6 Z51 Red/Black Sold 90'ZR-1 #1723 Black/Gray Sold but not forgotten 91' Z51 L98 White Vert. My First, you always remember your first. Sold. Last edited by Ccmano; 05-14-2018 at 09:37 PM. |
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05-15-2018
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#6 |
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Join Date: May 2018
Location: Cypress, Texas
Posts: 27
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Re: Vacuum leak
I am out of town today but will check tomorrow to see if it shuts off when the engine is running. Thanks
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05-16-2018
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#7 |
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Join Date: May 2018
Location: Cypress, Texas
Posts: 27
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Re: Vacuum leak
When I turn the ignition switch the pump cycles about 1 second on and one second off but once I start the car it goes off. Does anyone have a picture of their vacuum pump so I can see what is connected to the lower, white, connection on mine? Thanks
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05-16-2018
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#8 | |
 
Join Date: Dec 2003
Location: Arcadia,OK
Posts: 3,394
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Re: Vacuum leak
Quote:
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Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. |
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05-16-2018
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#9 |
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Join Date: Nov 2016
Location: Norway
Posts: 397
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Re: Vacuum leak
By outlet, I mean that is where the air is vented to atmosphere. You should feel a small amount of air coming out there when the pump is running. More if you pull off the elbow next to it.
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- '90 ZR-1 |
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05-16-2018
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#10 |
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Join Date: Nov 2016
Location: Norway
Posts: 397
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Re: Vacuum leak
1s cycle indicates leakage. Probably the check valve between secondary system and plenum.
You can check this by removing the vacuum line connected to the driver side of the plenum, between the runners, and plug the hose. If the pump stops cycling, or extends the interval, at least you've isolated one fault.
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- '90 ZR-1 Last edited by S.hafsmo; 05-16-2018 at 06:44 PM. |
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