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Showing results for tags 'injector leaking'.
Found 1 result
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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