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Old 01-04-2012, 05:52 AM   #1
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rough idle with oil filler cap off

I have been reading about the AOS and the white smoke. My car is new to me and I have seen the puff.

So I just was out pulling radio and did the pressure test on cap. It was a little tight to start twisting but not much pressure. But the idle got rough and tried to smooth out, heard a vacuum like noise. Again very little suction but idle changed and heard air.

Is this normal.
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Old 01-04-2012, 06:41 AM   #2
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Yes, it should run rough with the cap off since there is now a vacuum leak in the intake system.

To check the AOS, put your hand over the opening to seal it. You should feel just the slightest amount of vacuum.
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Old 01-04-2012, 06:46 AM   #3
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If you run with the cap off long enough, it will throw a CEL, too.
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Old 01-04-2012, 07:10 AM   #4
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Ok, I did not hold hand on but will do that in next couple of days. But from feeling of cap there will be very little. I thought that was normal with idle. New to Porsche so just being over careful.

Thanks
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