Engine Vacuum/Brake problem revisited

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Dec 1, 2004 | 01:48 PM

#21

SilverBeast

Drifting

Joined: Nov 2002

Posts: 1,593

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From: Mobile AL

St. Jude Donor '05

Quote:

Originally Posted by GiDvEtTe84

I thought more RPM should give you more vacuum.

The higher the RPM, the lower the vacuum. At WOT you have almost no vacuum.

Dec 1, 2004 | 02:53 PM

#22

CFI-EFI

Race Director

Joined: Sep 2000

Posts: 17,298

Likes: 33

From: The Top of Utah

Quote:

Originally Posted by GiDvEtTe84

For instance, it was in the upper 30's this morning. Let the car warm up. Still hard. Drove for 5 minutes, not hard anymore.

You have good vacuum, warm. The booster is functional, sometimes. How is the vacuum supply TO the booster? Is there a flap in the hose that partially obstructs the flow of air (vacuum)? How is the in line air filter? You could try subbing some gas line or other handy hose to connect directly from the manifold to the booster, as a test. Then install the filter in the test line, to see what happens. If those tests don't tell you something, exchange the booster as defective. You may have never needed a booster in the first place.

RACE ON!!!

Dec 1, 2004 | 04:45 PM

#23

GiDvEtTe84

Thread Starter

Drifting

Joined: Apr 2000

Posts: 1,915

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From: Maurice, LA

I replaced the hose with a real stiff fuel hose to make sure it wont collapse. I also ran a straight piece of hose with no filter. Neither fixed the problem.