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Registered
Join Date: Dec 2006
Location: Brentwood, California
Posts: 232
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The auxiliary enrichment only kicks in when you are in overrun (rpm >1350 and throttle at idle stops). The link that BK911 has a good description of the aux enrichment circuit and how to set it. An apparently common problem is that the rpm transducer stops working (do a search on rpm transducer -- lots of info on how to diagnose and fix -- much of it relates to MFI cars, but the device is the same for our Ts). None of this helps with your question about backfires when idling -- an issue I'm currently trying to address myself on my recently rebuilt Zeniths.
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1969 912/6 Coupe
1970 911 T Targa
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