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Dale Helman
Join Date: May 2013
Location: Spokane WA
Posts: 1
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idle oscillation
After engine warms up the idle begins to oscillate from normal to about 400 rpms about every 1to 2 seconds. Where would you begin looking?
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05-16-2014, 04:29 PM
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Registered
Join Date: Oct 2007
Posts: 363
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Could be the MAF sensor, or the AOS (Air Oil Separator). Some of the early warning signs of a failing AOS is hunting idle. On the Boxster, the symptoms seem to be more prevalent (engine smokes on start up, and hunting idle), but on the 996 the symptoms may not manifest in such an obvious way. Check engine light on?
Last edited by Yellowb1rd; 05-17-2014 at 01:52 PM.. |
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05-17-2014, 01:46 PM
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Registered
Join Date: Jan 2008
Location: NJ
Posts: 1,186
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What year? 1999 (and 2000?) non e-gas Have an idle control valve that can get gummed up and cause that.
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2013 991.1 Carrera S Cab 2004 996 Turbo CAB X50 sold 2003 996 cab 6 speed Sold 1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold DE instructor since 1985 |
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05-18-2014, 08:41 AM
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