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RPM "hunting" at idle

baronb55
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baronb55 Member

baronb55

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Hi everyone! I have been having a recurrent problem with idle. It happens only with the engine hot after my track session. As soon as I finish my track session. the idle RPM fluctuates wildly and many times the engine quits. I don't notice any problems at speed. The only codes I get on the Durametric are does related to the removal of the cats. I had the indy look at this but it did not do it with him. Friends tell me that this could be a vacuum issue. 6 months ago I changed the throttle snesor after getting a fault code. This problem started about 1 month ago. The car is a 1999 996 that is dedicated to the track. KN intake , headers and removal of teh cats are the main modifications in the engine. Any ideas on how to tackle this gremlin? Current odometer 85,000. New spark plugs and plug cables.

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Loren Member

Loren

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This is still likely an air leak. Try putting the stock intake back on - if the problem goes away then your K&N intake is the problem.

I've seen bad after market intakes several times and sometimes replacing them works and sometimes it does not.

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