Boost gauge people, how much vac do you see at idle?
From the Evo's shop manual:
So at idle, you should see vacuum of at least 51 kPa or 15 in Hg, which is about 0.5 bar.
MANIFOLD VACUUM CHECK
1. Before inspection, check that the engine oil, starter and
battery are normal. Also, set the vehicle to the following
conditions:
•Engine coolant temperature: 80 −95C (176 −203F)
•Lights, and all accessories: OFF
•Transaxle: Neutral
2. Connect an engine tachometer.
3. Attach a tee-fitting joint to the vacuum hose between the fuel
pressure solenoid and the intake manifold plenum, and
connect a vacuum gauge.
4. Start the engine and check that idle speed is within
specification. Then check the vacuum gauge reading.
Idle speed: 850 ± 100 r/min
Minimum limit: 51 kPa (15 in Hg)
1. Before inspection, check that the engine oil, starter and
battery are normal. Also, set the vehicle to the following
conditions:
•Engine coolant temperature: 80 −95C (176 −203F)
•Lights, and all accessories: OFF
•Transaxle: Neutral
2. Connect an engine tachometer.
3. Attach a tee-fitting joint to the vacuum hose between the fuel
pressure solenoid and the intake manifold plenum, and
connect a vacuum gauge.
4. Start the engine and check that idle speed is within
specification. Then check the vacuum gauge reading.
Idle speed: 850 ± 100 r/min
Minimum limit: 51 kPa (15 in Hg)
Evolving Member
Joined: Nov 2003
Posts: 253
Likes: 0
ok ok I idle at 20 which is much like a lot of us... but when I slam on it I spike above 20 and it drops down right above 20...
I dont think thats right ...Is it??? all I have is a BR turboback and an HKS RS kit
-non
I dont think thats right ...Is it??? all I have is a BR turboback and an HKS RS kit
-non
So a Idle vacuum that appears to be within spec (17-20 on stock Cam's) would indicate that there are no leaks correct? Or is it possible for leaks to still exist even when my cars shows 20 at idle?
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