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Pelican Technical Article:

Vacuum Lines

Steve Vernon

Time:

1-6 hours

Tab:

$2 to $100

Talent:

***

Tools:

Philips head screwdriver

Applicable Models:

Porsche 944 Turbo (1986-89)

Parts Required:

Vacuum lines and connections

Hot Tip:

Use care as the lines get old and brittle

Performance Gain:

Proper functioning engine

Complementary Modification:

Engine air filter

Like most cars from the mid 1980's era the Porsche 951 is susceptible to dry, cracked and leaking vacuum lines. These cars are dependent on a well working vacuum system for the vehicle to operate properly. A system with leaks or clogs in it can lead to all kinds of issues from rough running, bad idle, poor acceleration to the motor not running at all.

If you suspect a vacuum issue or leak it is a good idea to smoke test the system. Most of the leaks will be small and cause small problems but a bunch of leaks can add up to a big problem.

This article will attempt to show the various vacuum lines, where they run and their proper running position.

Most of these lines are located under the intake manifold and will necessitate the removal of the manifold to work on. Please see our article on intake manifold removal.

The fuel vacuum lines run from:
Figure 1

The fuel vacuum lines run from: 1- the control valve, 2- a Y splitter, 3-fuel pressure regulator, 4- intake manifold, 5- fuel dampener, 6- Y splitter, 7- air circulation valve, 8- vacuum banjo to manifold

Vacuum line 1- brake booster,
Figure 2

Vacuum line 1- brake booster, 2- check valve, 3- vacuum canister, 4- idle control valve

The cycling valve has three lines: red arrows- waste gate connection, green arrows- inlet air pipe side of turbo, yellow arrows- turbo boost side via banjo bolt.
Figure 3

The cycling valve has three lines: red arrows- waste gate connection, green arrows- inlet air pipe side of turbo, yellow arrows- turbo boost side via banjo bolt.

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