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Generation III Internal Engine 1997-2006 LS1 | LS6
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MS4 vacuum at idle?

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Old Oct 9, 2007 | 08:11 PM
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Kevin Doe
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Default MS4 vacuum at idle?
I have an MS4 cam, and I'm having trouble getting it running. I have pretty low manifold pressure at idle, 800 rpms. I have 71 kPa pressure, which equates to ~9 inHg vacuum. Is that normal?
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Old Oct 9, 2007 | 08:13 PM
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Originally Posted by Kevin Doe
I have an MS4 cam, and I'm having trouble getting it running. I have pretty low manifold pressure at idle, 800 rpms. I have 71 kPa pressure, which equates to ~9 inHg vacuum. Is that normal?
not surprised that cam has alot of overlap, with a 238-240 cam in a ls2 i have seen 64 kpa at idle
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Old Apr 28, 2008 | 01:51 PM
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Now that I've got it tuned up I see 60 kPa at idle, just an update. It was all in the tune.
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Old Apr 28, 2008 | 04:34 PM
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Originally Posted by Kevin Doe
Now that I've got it tuned up I see 60 kPa at idle, just an update. It was all in the tune.
Is your engine still idling @ 800rpm?

Christian
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Old Apr 28, 2008 | 04:34 PM
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Originally Posted by Kevin Doe
Now that I've got it tuned up I see 60 kPa at idle, just an update. It was all in the tune.

Just like he said. At an idle of 850 rpms I usually had 18" of vacuum
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