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987 Gen II, 2.9: rough idle, something to worry about?

Graham,

It could be that the AOS is just on the way out which could be giving rise to a rough idle. As you say, a totally failed AOS gives a persistent cloud of smoke.

PCT are a reputable Porsche outfit and should be able to diagnose the fault(s) quickly and rectify the problem.

The Gen2 engines appear to be more robust - no IMS shaft to worry about and the Alusil process is used for the aluminium cylinder blocks whereas the Gen1 engines used a casting technique called Lokasil. Whether or not the Alusil process is superior to that of the Lockasil method is open to question, but there don't appear to be many reported cases of bore scoring on the Gen2 engines which have been running since about 2008.

I'm sure that it's something straightforward and quickly rectified. Keep us posted.

Jeff
 
Good details Jeff, thank you as they are re-assuring!
I'm convinced the diaphragm of the AOS is just starting to split wider.
Looks a bitch of a job. Never had a car where you can't see the engine!
 
Dropped the Boxster over to PCT today where it will rest so they can check things out.
Current thinking is the temperature sensor which I guess at times gives an over-rich fuel on start-up, but I've had the smoke hot and cold engine, but in safe hands now.

hoping for a good call mid next week.
 
PCT have got to the problem, the engine Temperature Sensor is at fault and on order from Germany.
Might get it back end of next week.
 
That's excellent news Graham.

Hope that sorts it and you get the car back on the road ASAP to enjoy some summer motoring.

Jeff
 
Early up-date:

PCT have fitted the sensor for the engine temp from Germany and I collected the car last Thursday from Coventry.
They are happy the car is ok.

Tick-over is not silky smooth but better, but after all of10 start-up from cold, warm, hot not a whiff of smoke.

Early days I know.
Goes well as ever, 36 mpg.

Spanners crossed it is all ok.[:)]
 
3 weeks after getting the car back from PCT and after hot/cold/short-run and long-run starts and restarts all is well, not a whiff of smoke from the engine and the 'smell' of the engine around the car after a good run has gone.

Job done I think.
 
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