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Showing results for tags 'white smoke'.
2001 Boxster S 90k miles newly rebuilt engine. I just fitted a new AOS and it shows 4.6" but has huge clouds of oil smoke ! Edit - well, maybe not oil but un-burnt gas on a cold start? -see later Posts for diagnostics. Diagnosis: 1.I suspected the old AOS was due for replacement based on age and some white smoke after start up. The old AOS tested O.K. but replaced it anyway. The new one seemed no different in terms of white oil smoke production. I dissected the old AOS to see if the diaphragm was sagging/torn. It was perfect .I epoxy-ed it back together to carry as an emergency spare. Now I have huge plumes of white oil smoke and 4.6" of water vacuum on the Pyle manometer. BTW the oil pressure at start-up is 75+ lbs on a newly rebuilt engine and the compression/leakdown is perfect and even on all 6 cyl So is the 4.6" AOS defective/marginal ? What should a new, perfect AOS measure ? Pelican say 4"- 7" is O.K. and above 9 is fail - so I may have to try the block-off hack for diagnosis here: " If you're still not sure, you can take a closer look at the hose that connects the air-oil separator to the intake manifold (yellow arrow, Figure 2). If the unit is failing, then there will be a significant amount of oil or residue in this tube. If the car is running rough, then removing this tube and blocking off both ends should disable the system and restore previous performance. This is not a long-term fix, but instead a short-term diagnosis step to use before you replace the air-oil separator. " I ask because there has been discussion of defective,new AOS units from even reputable suppliers. I bought my new (4.6") one from name begins with Auto and ends AZ. I used to buy from RND/SSF in Los Angeles but they have 'retired'. 2. There is also a ?related? P0301 Misfire which I had blamed on Ticking Lifters(now replaced). The code persists . There is gasoline seeping from around Cylinder # 1 header tube at the steel gasket. That is near where the SAI pumps into. Coincidence? I did recently repair /completely overhaul the SAI system to pass the Ca Smog Test. It passed easily and ran well until the lifters started ticking(again). There is a good spark at Cyl 1 and it has good compression/leakdown compared to the other cylinders. Why would a marginal AOS push gasoline out of the gasket near Cyl 1 exhaust pipe? Car starts easily and runs smoothly other than Cyl 1. What other tests to do for diagnosis ? BTW if the Cyl 1 misfire caught your attention ,the best recent ,comprehensive Thread on that subject that I found to help is linked below. Interesting that there were multiple causes but mainly bad lifters,Variocam issues and a mismatched/under-performing injector on cyl#1. Fuel Trims were not very helpful in the diagnosis. https://rennlist.com/forums/996-forum/917082-yet-another-996-cylinder-1-misfire-thread.html
Hello, Please have a look at this video: https://www.youtube.com/watch?v=4WD1b8naXgo On my car it only lasts for a couple seconds. This occurs perhaps 1 per 20 startups and I have a strong feeling that only after cold nights or during cold mornings (defining cold here as 40-50F). I drive this car on a daily basis. Would you consider this normal behaviour? Many are posting similar questions like mine but without a video it is hard to judge if it is fine and occurs because some oil flows past rings to combustion chamber due to Boxster engine layout. Also some are talking of white, some grayish and some blue smoke :-) My car is 996, 2004, 3.6L, around 90k miles. AOS, plugs, coils are brand new. Both exhaust and cats look like brand new when borescoping. Leak down test >96/100PSI each cylinder, does not consume oil or coolant. Oil level is very close to maximum level, perhaps a tad lower than maximum. Using Motul X-Cess 8100 5w40. Thank you!
Okay I know this has been covered a million times. I searched and read quite a few topics. And I know it's common for Boxsters, but I need just a little input. 2002 Boxster, tiptronic, 116k miles. For quite a while now (since I got the car 2 years ago), every couple weeks or so on a random startup I would get a decent sized cloud of white smoke out of the back. As soon as I drove off, no problem. I know there's oil that drains and it gets burned off on startup. However, in the last couple weeks I've noticed the cloud of smoke is a lot more frequent. But it's not usually during the day, just on a cold startup (the car has sit for several hours). It's just about every other day. It's been about 6000 miles since my last oil change. I did the AOS check by seeing if I left the car idling and removed the oil filler cap whether it was hard to remove. It was not, the car just kind of made a grumpy noise because it lost vacuum. I have absolutely no performance problems that I can see or feel, and the smoke is always only on startup, not while the car is running. Should I have my AOS changed anyway? Is there any other tests I should do? Should I just continue to drive it as is until I notice a performance problem or something more severe? Is it possible I just need some fresh oil and a new filter? Thanks!