Problem with vacuum

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Jun 18, 2015 | 11:48 AM

vbruno

Thread Starter

2nd Gear

Joined: Jun 2015

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From: Geneva

Problem with vacuum

Hi everybody,

I have a problem with the vacuum of my C3 1970 automatic transmission big block 454, and I can't find the problem because I think I dont have the correct diagram.

Someone can help me to find the diagram plese ?

2) can you tell me what is this lever for ?

(Sorry for my English)

Thanks alot.
Fabio

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Jun 18, 2015 | 01:03 PM

69Vett

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Joined: Oct 2007

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From: Austin Texas

Corvette of the Year Winner 2017

2016 C3 of Year Finalist

that lever is not stock.
if you have vacuum problems first thing isolate all vacuum hoses and record engine base line vacuum.
start adding hoses 1 at a time, until you find your leaks.

Last edited by 69Vett; Jun 18, 2015 at 01:05 PM.

Jun 18, 2015 | 01:06 PM

mikem350

Melting Slicks

Joined: Feb 2006

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From: Sunrise FL

That lever?? You will have dig around under the dash and see what it is connected to. Or at least report back if it has wires OR hoses connected to it.

Jun 19, 2015 | 01:38 PM

Easy Mike

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From: Southbound

Cruise-In II Veteran

Quote:

Originally Posted by vbruno

...I think I dont have the correct diagram...Someone can help me to find the diagram plese?...

FWIW: The assembly instruction manual (AIM) shows the factory vaccum system, the connections, color codes, etc. and includes headlight switch and overrides under the dash. Helpful when chasing vacuum connections.

Jun 19, 2015 | 05:18 PM

7T1vette

Team Owner

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From: Crossville TN

That lever is not stock; but it looks like it is taking the place of the trip odometer reset **** (pull down and turn to reset to 0000).

Jun 20, 2015 | 05:14 AM

vbruno

Thread Starter

2nd Gear

Joined: Jun 2015

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From: Geneva

Quote:

Originally Posted by 7T1vette

That lever is not stock; but it looks like it is taking the place of the trip odometer reset **** (pull down and turn to reset to 0000).

I don't think its the trip odometer, 3 hoses are connected
I need to start all over again !!!!

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Jun 20, 2015 | 10:37 PM

69Vett

Safety Car

Joined: Oct 2007

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From: Austin Texas

Corvette of the Year Winner 2017

2016 C3 of Year Finalist

Quote:

Originally Posted by vbruno

I don't think its the trip odometer, 3 hoses are connected
I need to start all over again !!!!

It appears to be a 3 way vacuum valve, not Orginal

Jun 21, 2015 | 08:09 AM

Super6

Burning Brakes

Joined: Feb 2012

Posts: 925

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And much larger line without the factory colored striping to help you figure out what is what. If you can help, try to troubleshoot what you have without taking the driver's dash panel off, that is a nightmare to put back on correctly. 10 pounds in a 5 pound hole.