Hi all
new to this forum and 1st post
I have a 99 911 C4 (996)
I took it out the other day drove it normal from cold and notice after a couple of miles Smoke from my rear mirror.
I pulled over and it was bellowing out from both tail pipes on tick over .turned it off and towed it home.
I few times before it I could hear a squealing noise as if it was a loose belt but no belt was slack .
the smoke is white and stays in the air .

could do with some advise please (and reasurance)
hoping it's not terminal

Cheers

 

it could be your AOS is failing

 

Yes, as MkC2S said, the most likely scenario is the Air/Oil Separator (AOS). This is a common failure point of the M96 engines.

 

There are a few common ways oil is making it to the combustion chamber, but a failing AOS is the most common on these cars. You should get a manometer and test for "inches of water column". The unit tests the vacuum of the cylinders. It should read around a "5" inches of water.

https://rennlist.com/forums/996-foru...is-mean-2.html

 

Thanks for the replys guys
I have been quoted on 14 hours to do the job ,does that sound right ?!

 

Basically quoting for two days of work? Nope, not in my opinion unless the shop insists on removing the engine to do this job. A skilled mechanic can install the AOS by lowing the engine. It's a beast of a job from what I've personally seen and so I can see why most people elect to have it done with the transmission and/or engine is removed for other things like a clutch replacement or IMS install.

What is the totally estimate in $$?

 

14 hrs ??? yikes
I had mine replaced 3 months ago on my 997 & my indy charged me 4.8 hrs @ $145.00.
Maybe you need to get another estimate somewhere else.

 

Also depends on whether it's a Tiptronic or Manual. Tiptronic cars require engine removal to replace the AOS.