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Distributor Vacuum lines

Forum: C4 Engines, Driveline and Handling

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Distributor Vacuum lines

Posted: 11/8/10 3:37amMessage 1 of 10
r
rugdoz
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Merritt Island, FL - USA
Joined: 4/27/2008
Posts: 35
Vette(s): 1981

Bought a 96 with a LT-4 engine and as we are going through everything, the distributor vacuum lines are not connected.  Getting deeper into it, am wondering which line connects to air intake and which one connects to engine vent.  Thinking the smaller distributor line closer to the block is the intake line.  Wondering the effect of not having it hooked up and any pointers on where to get hose kits and tricks to reconnecting without taking everything off.  Thanks!   

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Distributor Vacuum lines

Posted: 11/8/10 6:04pmMessage 2 of 10
e
eddie20875
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Lanoka Harbor, NJ - USA
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Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
just a question here...are you sure there is supposed to be vacuum lines going to the distributor? on my 90 the computer and sensors control the advance on it. if i come across a diagram i will let you know.
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Distributor Vacuum lines

Posted: 11/9/10 3:11amMessage 3 of 10
r
rugdoz
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Merritt Island, FL - USA
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I understand the two lines are to keep the LT-1/LT-4 distributers dry and was a change from the eirlier C-4s.  I found the distributer vacuum harness  on-line from the GM Parts Center, Part number 12558921, Cheverlot has discontinued providing the part.  It is a beast to get to when the distributer is on the car.
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Distributor Vacuum lines

Posted: 11/9/10 4:37amMessage 4 of 10
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eddie20875
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Lanoka Harbor, NJ - USA
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Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
send a PM to adam's apple and he might be able to tell you.
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Distributor Vacuum lines

Posted: 11/9/10 6:13amMessage 5 of 10
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Adams' Apple
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Duncanville, TX - USA
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
There is a vacuum line going to the dist to try to keep the moisture down, Along with the vacuum, there is another line going up to the throttle body/air intake. This line is to allow fresh air into the dist, while the vac pulls it thru. The idea is to keep fresh clean air circulating thru the dist to keep it dry. Moisture and Opti-Spark do NOT mix well!
I'm not sure it would make any difference at all which line went where...I'll see if I can pull up a diagram...

As far as the vac harness, you might try "thepartsladi" on e-bay. They have TONS of discontinued, NOS GM parts, and they go by part numbers. Since you have the GM #, they should be able totell ya pretty quick if they have it or not. Sometimes, they will also offer to help search for stuff they don't have. It's worth a crap. I know they do sell quite a few Opti-Spark distributors....
Adams' Apple2010-11-09 11:03:45

Joel Adams
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Distributor Vacuum lines

Posted: 11/9/10 3:11pmMessage 6 of 10
b
bobges
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I think the partsladi is done on ebay, alot of bad deals, check but be careful 
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Distributor Vacuum lines

Posted: 11/9/10 7:31pmMessage 7 of 10
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eddie20875
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Lanoka Harbor, NJ - USA
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Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
[QUOTE=bobges]I think the partsladi is done on ebay, alot of bad deals, check but be careful  [/QUOTE]
i heard the samething. think she got booted.
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Distributor Vacuum lines

Posted: 11/10/10 5:44amMessage 8 of 10
r
rugdoz
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Merritt Island, FL - USA
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The on-line GM parts center Canax my order.  Back to making it myself.  Really Appricate all the input on what I am dealing with.  Thanks!     Clap 
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Distributor Vacuum lines

Posted: 11/10/10 5:57amMessage 9 of 10
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Adams' Apple
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Duncanville, TX - USA
Joined: 11/8/2003
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Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
[QUOTE=eddie20890][QUOTE=bobges]I think the partsladi is done on ebay, alot of bad deals, check but be careful  [/QUOTE]
i heard the same thing. think she got booted.[/QUOTE]

Embarrassed I did not know that...I had heard they were a great place to get NOS parts from. They've never had anything I was looking for, tho.Ouch

The vacuum line for the dist comes from the rear area of the intake plenum. Then the vent line from the dist goes up to the air cleaner housing somewhere. The diagram I have is not very detailed.



Joel Adams
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Distributor Vacuum lines

Posted: 11/10/10 5:48pmMessage 10 of 10
b
bobges
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Try Jason at vet to vet- 815-673-6200, i can't find his web page at this time
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