Quote:
Originally Posted by Old Mechanic
...You need to tap the vacuum from the intake plenum, where all the manifold runners meet.
My preference is the hose to the brake booster, which should connect to a steady vacuum source. If you try that and it still fluctuates it might indicate there is a problem with the engine, induction, or ignition systems.
Idle vacuum is also a function of idle speed, and engine compression. My Echo is 10.5 to one so it reads fairly high idle vacuum...
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The compression ratio for my car is 10.1:1 with the idle at 650-675 RPM. If the vacuum readings i'm getting now stay this way, i'll try connecting it to the brake booster like u had said.
This is where i have it connected to currently (sry the arrows are kinda small):
