Quote:
Originally Posted by ischmitz
If your air metering is stock then you have a barn-door style AFM (flapper box) as Don said. MAF (mass air flow) sensors are stock on 993 and later. There are some aftermarket MAF kits for the 964 though for $$$$.
So with the stock AFM the K&N filter does not cause a problem with oil. The reason that your mechanic and others do not like them is that their efficiency is worse compared to the stock filter. On top of that I believe some have found the stock air box draws colder air due to its nozzle location. The reason some like them is the intake sound....
Back to your issue: Do all the tests others have suggested. I think that either the AFM (or its connection) or the O2 sensor (or its connection) are the prime suspects. In my case the issue would show up at random after going days to week without anything. That pointed to the connectors. It made it all the more difficult to pin down without the Bosch tester. Every time you unplug something to measure and put it back together the failure "hides" for a while because the contacts clean themselves to some extend in the proces. You might want to get some electronics contact spray and a small brush and clean the connectors thoroughly.
BTW: A bad or missing CHT would cause cold-start issues and lean running when cold.
Hope that helps,
Ingo
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ah ha..this sounds like my problem, and i agree with all the points about the k&n - like it for the sound. last time it was running rich, dumping raw fuel through the exhaust, it was awful..black smoke and even a small fire i had to extinguish when i tried to make it to the wrench's shop. wrench actually came to my house (not a typo)..and what he did was to clean the afm connections, i'm almost certain. he had to remove the filter to get to the connector and he cleaned the contacts with a wire brush i have. right now, the problem has mysteriously vanished..so i need to know what the afm connector looks like, where to find it exactly and i'll clean that sucker..
