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RPM "hunting" at idle

baronb55
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baronb55 Member

baronb55

Posted
Posted

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

Posted
  • Admin
Posted

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.

logray Member

logray

Posted
Posted

If you've eliminated vacuum leaks and the stock box doesn't fix it, other possibilities are:

DME (just experienced this one).

IACV (been there done that).

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