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Registered
Join Date: Nov 2010
Posts: 20
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997 rough idle
i have a 997 here with the typical p2187 and p2189. i have replaced all o2 sensors all coils and the maf sensor. could the rough idle be caused by the throttle body and set these codes?
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11-14-2011, 08:50 AM
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Porsche Wheels
Join Date: Feb 2011
Location: South El Monte, CA
Posts: 324
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Quote:
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11-14-2011, 10:50 AM
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Registered
Join Date: Nov 2010
Posts: 20
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yes, they came back twice.
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11-14-2011, 11:16 AM
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Registered
Join Date: Jan 2009
Location: maryland
Posts: 271
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I looked up in the manual and 2187 and 2189 are sort of companion codes. They mean that the fuel trims are so far out that they are uncorrectable to bring lambda to a 1 value. They are written to indicate a bad condition (either rich or lean) at an off idle under load (RKAT) or the lower range of the freeway driving speeds (FRAU). You must use the scanner to see what the fuel trims are at the RKAT and the FRAU load values. This will tell you whether you have a rich or lean condition.
Some of the items mentioned are (too rich) fuel pressure too high, leaking injector, maf sensor inaccurate; or (too lean) tank vent valve stuck open, sai valve leaking, fuel pressure too low, maf inaccurate. |
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11-15-2011, 09:59 AM
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Registered
Join Date: Nov 2010
Posts: 20
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thank you matt. should i be looking at the fuel trim driving or at idle? the car will idle fine one day then horrible the next, it is intermittent.
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11-15-2011, 12:58 PM
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Registered
Join Date: Jan 2009
Location: maryland
Posts: 271
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Using PIWIS I would look up the codes as they will have expanded data and will tell you rich or lean and at what range. Maybe autologic has same capability. If not try durametric on front pass seat and read fuel trims while driving in failure mode.
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11-15-2011, 02:13 PM
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