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earling
Joined: 24 Oct 2007
Posts: 105
Location: Lenox, MA
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 Posted: Thu Nov 29, 2007 11:12 pm Post subject: weird plateau |
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My 931 has a noticeable flat spot in power delivery at around 3,000 RPM then comes on strong again around 3,400 RPM but not pulling as hard as before the lag. It's not extreme, but just enough to bug me and make me wonder what's causing it
Timing is set stock (20 BTDC @ 2,000 RPM), but no way of telling if the centrifigal advance is working perfectly; vac advance seems fine. Boost is 12
any clues?
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1980 931 w/88K, decorating a field for 3 yrs. |
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earling
Joined: 24 Oct 2007
Posts: 105
Location: Lenox, MA
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| Posted: Thu Nov 29, 2007 11:31 pm Post subject: also |
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I've been wondering about those micro switches by the throttle. I suspect the one that is closed (opened) at around that RPM . . . what do these things do, anyway?
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1980 931 w/88K, decorating a field for 3 yrs. |
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462avi
Joined: 15 Sep 2006
Posts: 149
Location: Hollister, California
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| Posted: Fri Nov 30, 2007 6:43 am Post subject: |
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one switch is for full throttle enrichment the other is for idle. You may have an exhaust leak at the turbo.
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2005 C230K
2002 grand cherokee with 4.7L |
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