Blue smoke on startup

[Karl Owen]

My bone-stock 2007 997.1 C4S with 71k miles is my daily driver, and the last few days it has a big puff of blueish smoke upon engine startup which then clears in a few seconds. The smoke occurs in the morning (cold start) and also on warm restart. I searched on Google and found that these engines can burn a little oil etc, but strangely enough it hasn't done this for 11 years and 70k miles, so I am thinking something is wrong. Coolant is not low. Car maintained at the dealership, except for oil changes which I do myself every 5000 miles.

Also has P2187/2189, which it had before and I cleared it with Durametric thinking it's the gas cap. Maybe I am imagining it but the exhaust is a little more hoary than before.

Any ideas? Thanks guys.

[Jager]

Air Oil Separator (AOS) would be my first guess.

[Karl Owen]

 I just ran the Durametric on it:

	Bosch Digital Motor Electronics Motronic 7.8.1
	Module Identification
	Part Number      997.xx Supplier Part Number      xx
	Current Fault Codes
	P2187 Oxy. sensor control adapt. RKAT bank 1 range near idle speed Freeze Frame Information Fault symptom Limit exceeded   Self test not complete   Fault status fault not present   Warning light off   Fault path num 49920   FLC/HLC state 10   Fault check state 0A   FCM line status 00   FCM output data (mil, svs) 11   Error Path Status 9217   Counter Continuous Error 0   Counter Accumulated Error 256   MIL on counter 1   MIL off counter 3   Clear counter 78   Frequency counter 1   Calculated LOAD value 18 % Engine coolant temperature 88 °C Short Term Fuel Trim - Bank 1 13 % Long Term Fuel Trim - Bank 1 2 % Short Term Fuel Trim - Bank 2 11 % Long Term Fuel Trim - Bank 2 2 % Vehicle speed sensor 0 km/h Ignition Timing Advance for #1 Cylinder 3 ° Intake Air Temperature 51 °C Absolute Throttle Position 12 % Commanded Secondary Air Status 04   Commanded Evaporative Purge 0 % Barometric Pressure 940 kPa Relative Throttle Position 1 % Ambient air temperature 27 °C Absolute Throttle Position B 12 % Commanded Throttle Actuator Control 1 % Long term secondary oxygen sensor fuel trim - Bank 1 0 % Long term secondary oxygen sensor fuel trim - Bank 2 0 % Fuel system 1 status 0480   Engine RPM 704 rpm Air Flow Rate from Mass Air Flow Sensor 4 g/s Absolute Load Value 48 % Total operating time (first occurrence) 2563.4 h Total mileage (first occurrence) 114642 km
	P2189 Oxy. sensor control adapt. RKAT bank 2 range near idle speed Freeze Frame Information Fault symptom Limit exceeded   Self test not complete   Fault status fault not present   Warning light off   Fault path num 50176   FLC/HLC state 10   Fault check state 0A   FCM line status 00   FCM output data (mil, svs) 11   Error Path Status 9217   Counter Continuous Error 0   Counter Accumulated Error 256   MIL on counter 1   MIL off counter 3   Clear counter 78   Frequency counter 1   Calculated LOAD value 18 % Engine coolant temperature 88 °C Short Term Fuel Trim - Bank 1 13 % Long Term Fuel Trim - Bank 1 2 % Short Term Fuel Trim - Bank 2 11 % Long Term Fuel Trim - Bank 2 2 % Vehicle speed sensor 0 km/h Ignition Timing Advance for #1 Cylinder 3 ° Intake Air Temperature 51 °C Absolute Throttle Position 12 % Commanded Secondary Air Status 04   Commanded Evaporative Purge 0 % Barometric Pressure 940 kPa Relative Throttle Position 1 % Ambient air temperature 27 °C Absolute Throttle Position B 12 % Commanded Throttle Actuator Control 1 % Long term secondary oxygen sensor fuel trim - Bank 1 0 % Long term secondary oxygen sensor fuel trim - Bank 2 0 % Fuel system 1 status 0480   Engine RPM 704 rpm Air Flow Rate from Mass Air Flow Sensor 4 g/s Absolute Load Value 48 % Total operating time (first occurrence) 2563.4 h Total mileage (first occurrence) 114642 km
	P2187 Oxy. sensor control adapt. RKAT bank 1 range near idle speed Freeze Frame Information Fault symptom open circuit   Self test not complete   Fault status fault not present   Warning light off   Fault path num 21248   FLC/HLC state 10   Fault check state 0A   FCM line status 00   FCM output data (mil, svs) 44   Error Path Status 2817   Counter Continuous Error 0   Counter Accumulated Error 256   MIL on counter 1   MIL off counter 3   Clear counter 78   Frequency counter 1   Calculated LOAD value 18 % Engine coolant temperature 88 °C Short Term Fuel Trim - Bank 1 13 % Long Term Fuel Trim - Bank 1 2 % Short Term Fuel Trim - Bank 2 11 % Long Term Fuel Trim - Bank 2 2 % Vehicle speed sensor 0 km/h Ignition Timing Advance for #1 Cylinder 3 ° Intake Air Temperature 51 °C Absolute Throttle Position 12 % Commanded Secondary Air Status 04   Commanded Evaporative Purge 0 % Barometric Pressure 940 kPa Relative Throttle Position 1 % Ambient air temperature 27 °C Absolute Throttle Position B 12 % Commanded Throttle Actuator Control 1 % Long term secondary oxygen sensor fuel trim - Bank 1 0 % Long term secondary oxygen sensor fuel trim - Bank 2 0 % Fuel system 1 status 0480   Engine RPM 704 rpm Air Flow Rate from Mass Air Flow Sensor 4 g/s Absolute Load Value 48 % Total operating time (first occurrence) 2563.4 h Total mileage (first occurrence) 114642 km
	P2189 Oxy. sensor control adapt. RKAT bank 2 range near idle speed Freeze Frame Information Fault symptom open circuit   Self test not complete   Fault status fault not present   Warning light off   Fault path num 21504   FLC/HLC state 10   Fault check state 0A   FCM line status 00   FCM output data (mil, svs) 44   Error Path Status 2817   Counter Continuous Error 0   Counter Accumulated Error 256   MIL on counter 1   MIL off counter 3   Clear counter 78   Frequency counter 1   Calculated LOAD value 18 % Engine coolant temperature 88 °C Short Term Fuel Trim - Bank 1 13 % Long Term Fuel Trim - Bank 1 2 % Short Term Fuel Trim - Bank 2 11 % Long Term Fuel Trim - Bank 2 2 % Vehicle speed sensor 0 km/h Ignition Timing Advance for #1 Cylinder 3 ° Intake Air Temperature 51 °C Absolute Throttle Position 12 % Commanded Secondary Air Status 04   Commanded Evaporative Purge 0 % Barometric Pressure 940 kPa Relative Throttle Position 1 % Ambient air temperature 27 °C Absolute Throttle Position B 12 % Commanded Throttle Actuator Control 1 % Long term secondary oxygen sensor fuel trim - Bank 1 0 % Long term secondary oxygen sensor fuel trim - Bank 2 0 % Fuel system 1 status 0480   Engine RPM 704 rpm Air Flow Rate from Mass Air Flow Sensor 4 g/s Absolute Load Value 48 % Total operating time (first occurrence) 2563.4 h Total mileage (first occurrence) 114642 km

[JFP in PA]

I would have to agree with Jager, I would start by hooking up a digital manometer to the oil fill cap and reading the crankcase vacuum, which should be no more than 5 inches of water.

[Karl Owen]

I would have to agree with Jager, I would start by hooking up a digital manometer to the oil fill cap and reading the crankcase vacuum, which should be no more than 5 inches of water.

Thank you both you guys are great! Will post an update for the archives once sorted out.

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[Karl Owen]

Yup, it was the AOS. Hat tip to you, gentlemen.

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[Jager]

Thank you for the follow-up, resolution, post.