White smoke on start up

[Stevenash56]

Hi all I hope you can help with some answers 986 3.2s recently mot,d with no emmisision issues what so ever never had issues with white smoke on start up before. Drove about 50-80 miles .Now on start up huge plumes of white smoke and I mean it hangs for 1 to 2 minutes in the air .Then on driving goes away on start up from even leaving it only 1 minute smokes again then goes away .It's not the normal small puff as is known on boxster .last trip engine became lumpy as in mis firing and white smoke as if the engine had gone then on acceleration disappeared as did the misfire. I hope you may have some avenues I could go down . I've changed the MAF no change .Engine light doesn't come on. Was looking at changing coil packs Lambda Sensor's to see if this helped
Thanks in advance
Steve

 

[3286ib]

Hi all I hope you can help with some answers 986 3.2s recently mot,d with no emmisision issues what so ever never had issues with white smoke on start up before. Drove about 50-80 miles .Now on start up huge plumes of white smoke and I mean it hangs for 1 to 2 minutes in the air .Then on driving goes away on start up from even leaving it only 1 minute smokes again then goes away .It's not the normal small puff as is known on boxster .last trip engine became lumpy as in mis firing and white smoke as if the engine had gone then on acceleration disappeared as did the misfire. I hope you may have some avenues I could go down . I've changed the MAF no change .Engine light doesn't come on. Was looking at changing coil packs Lambda Sensor's to see if this helped
Thanks in advance
Steve

 

[3286ib]

Hi all I hope you can help with some answers 986 3.2s recently mot,d with no emmisision issues what so ever never had issues with white smoke on start up before. Drove about 50-80 miles .Now on start up huge plumes of white smoke and I mean it hangs for 1 to 2 minutes in the air .Then on driving goes away on start up from even leaving it only 1 minute smokes again then goes away .It's not the normal small puff as is known on boxster .last trip engine became lumpy as in mis firing and white smoke as if the engine had gone then on acceleration disappeared as did the misfire. I hope you may have some avenues I could go down . I've changed the MAF no change .Engine light doesn't come on. Was looking at changing coil packs Lambda Sensor's to see if this helped
Thanks in advance
Steve

 

[3286ib]

Hi Steve,
Could be the AOS (Air oil separator)

 

[1WEL]

Have you lost any coolant?
Re: excessive exhaust smoke, years ago I was taught as a general rule of thumb:-
White smoke = burning water
Blue smoke = burning oil
Black smoke = over fuelling (diesels)

 

[911hillclimber]

Your first action imho should be to replace your AOS, about £60 to buy from Porsche, a pain to replace (I've read), about £300 at an Indie fitted.

The oil residue will still linger in the inlet tract for a while, so the issue will still persist for a while and slowly disappear.

When you have changed the AOS, carefully open the old one up (it s not designed to come apart) and see if the rubber diaphragm inside is split.
If it is then oil from the crank case has got into the inlet tract and hence to one/more of the cylinders and on start-up you get the heavy smoke.

To see if the water of the cooling system is in the engine, with the engine off, remove the oil filler cap and look at the underside, it should be nice and clean.

I hope it is your AOS!
Graham.

 

[Motorhead]

Steve,

As already noted, the AOS is favourite but firstly it would be worth checking the inlet ducting downstream of the MAF to check for the presence of oil which would indicate an AOS problem.

Jeff

 

[Stevenash56]

Thanks for the replies I have no white emulsion on oil filler cap that was my first thought but all clean and dry. No loss of coolant either .I will exchange AOS as you've all said And will check all intake pipes for oil .