Vacuum Lines Disconnected
Thread Starter
Navigator
Joined: Dec 2009
Posts: 9
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Vacuum Lines Disconnected
Hi,
I bought my wife an 81 that has all the original parts in a box, but has a new manifold and carb. After poking around, it appears that there are many vacuum lines (hoses - maybe not all vacuum) that are disconnected and just laying there open ended. Is this a bad thing? How do I figure out what all these are for and which are critical? The car runs well, windshield wipers and lights work. Any suggestions would be appreciated. I want it to be right.
Also, where do I get a diagram of how all this stuff is supposed to be hooked up on the original?
Shiff
I bought my wife an 81 that has all the original parts in a box, but has a new manifold and carb. After poking around, it appears that there are many vacuum lines (hoses - maybe not all vacuum) that are disconnected and just laying there open ended. Is this a bad thing? How do I figure out what all these are for and which are critical? The car runs well, windshield wipers and lights work. Any suggestions would be appreciated. I want it to be right.
Also, where do I get a diagram of how all this stuff is supposed to be hooked up on the original?
Shiff
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
It would be much easier to help if you post a couple pics.
Here's an AIM on CD that might help.
http://willcoxcorvette.com/product_i...ducts_id=25543
Here's an AIM on CD that might help.
http://willcoxcorvette.com/product_i...ducts_id=25543
Last edited by ...Roger...; Dec 13, 2009 at 12:06 PM.
Thread Starter
Navigator
Joined: Dec 2009
Posts: 9
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Shop Manual
Would this be the Shop Manual or is there something else/better?
http://www.ecklers.com/product.asp?p...10&dept_id=226
Shiff
http://www.ecklers.com/product.asp?p...10&dept_id=226
Shiff
Instructor
Joined: Sep 2009
Posts: 135
Likes: 2
From: Waterbury CT.
Go to abebooks.com and enter 1981 corvette on the key word line.
54. Bookseller Photo 1981 Chevrolet Corvette Shop Manual ST-364-81
No Author Noted
Bookseller: Good Earth Books
(Evansville, IN, U.S.A.)
Bookseller Rating:
Quantity Available: 1
Book Description: Chevrolet Motor Division, Detroit, Michigan, U.S.A., 1980. Trade Paperback. Book Condition: Good Minus. No Jacket. 8 1/2 x 11 inches. This shop manual is sound and tight and 100% readable; interior is surpisingly clean, considering that the exterior is quite soiled; binding shows rubbing and edgewear but is still solid and very firmly attached and not torn. Unpaginated, but 1 1/4" thick and printed on thin but sturdy stock and profusely illustrated. "This manual contains procedures for diagnosis, maintenance adjustments, minor service operations, replacement of components (Service) and for disassembly and assembly of major components (Unit Repair-Overhaul).". Bookseller Inventory # 012764
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Price: US$ 60.00
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54. Bookseller Photo 1981 Chevrolet Corvette Shop Manual ST-364-81
No Author Noted
Bookseller: Good Earth Books
(Evansville, IN, U.S.A.)
Bookseller Rating:
Quantity Available: 1
Book Description: Chevrolet Motor Division, Detroit, Michigan, U.S.A., 1980. Trade Paperback. Book Condition: Good Minus. No Jacket. 8 1/2 x 11 inches. This shop manual is sound and tight and 100% readable; interior is surpisingly clean, considering that the exterior is quite soiled; binding shows rubbing and edgewear but is still solid and very firmly attached and not torn. Unpaginated, but 1 1/4" thick and printed on thin but sturdy stock and profusely illustrated. "This manual contains procedures for diagnosis, maintenance adjustments, minor service operations, replacement of components (Service) and for disassembly and assembly of major components (Unit Repair-Overhaul).". Bookseller Inventory # 012764
Bookseller & Payment Information | More Books from this Seller | Ask Bookseller a Question
Price: US$ 60.00
Convert Currency
Shipping: US$ 3.95
Within U.S.A.
Destination, Rates & Speeds
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
In answer to your original question.... Yes, having vacuum lines loose/open is a bad thing, particularly if the other end is still connected to the intake manifold and/or carb. Vacuum leaks are a major source of idle and performance problems. In addition, not being connected means that they are not providing signal to the devices which they were intended to operate...ie, EGR valve, distributor vacuum can, etc, etc. Study the vacuum system design and the function of the devices connected to it. Then decide which ones you need to keep, which ones you want to keep, and which you can discard without negative impact to the vehicle.
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Drifting
Joined: Aug 2009
Posts: 1,635
Likes: 8
From: Enid Oklahoma
Hi,
I bought my wife an 81 that has all the original parts in a box, but has a new manifold and carb. After poking around, it appears that there are many vacuum lines (hoses - maybe not all vacuum) that are disconnected and just laying there open ended. Is this a bad thing? How do I figure out what all these are for and which are critical? The car runs well, windshield wipers and lights work. Any suggestions would be appreciated. I want it to be right.
Also, where do I get a diagram of how all this stuff is supposed to be hooked up on the original?
Shiff
I bought my wife an 81 that has all the original parts in a box, but has a new manifold and carb. After poking around, it appears that there are many vacuum lines (hoses - maybe not all vacuum) that are disconnected and just laying there open ended. Is this a bad thing? How do I figure out what all these are for and which are critical? The car runs well, windshield wipers and lights work. Any suggestions would be appreciated. I want it to be right.
Also, where do I get a diagram of how all this stuff is supposed to be hooked up on the original?
Shiff
Thread Starter
Navigator
Joined: Dec 2009
Posts: 9
Likes: 0
The lines that are disconnected appear to only be relevant to a cold start EGR 'feature' to keep emissions down when the engine is cold. Not mission critical, but I will probably hook them up again. The Vacuum chart has different colors and lines with stripes. What is the difference between the lines - there is no color code or legend on the diagram in the car or in the book?
Racer
Joined: Dec 2009
Posts: 308
Likes: 2
From: South Italy
Hello,
put some picture of your engine bay,in this way is to easy help you.
If you can drive the car with out all the stauff for smog(legal for your contry) remove it.
I have an '81 too and I have removed and the engine bay appear too clean.
Merry X-Mas
Giuseppe
put some picture of your engine bay,in this way is to easy help you.
If you can drive the car with out all the stauff for smog(legal for your contry) remove it.
I have an '81 too and I have removed and the engine bay appear too clean.
Merry X-Mas
Giuseppe
Racer
Joined: Nov 2009
Posts: 289
Likes: 0
From: Franksville Wisconsin
I agree, souds like computer system has been defeated. Thats a good thing it will be less problems down the road. I just did that on my '81, it the best thing I ever did to it.
You just need to find out what the lines were for and reconnect or remove if its somthing for the emissions. If you need to pass emission test a '81 without computer. etc.. will pass as long as you have a converter and proper tuning. Pictures on here will help us help you. Congrats and Good luck
You just need to find out what the lines were for and reconnect or remove if its somthing for the emissions. If you need to pass emission test a '81 without computer. etc.. will pass as long as you have a converter and proper tuning. Pictures on here will help us help you. Congrats and Good luck
