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Originally Posted by Petza914
(Post 19427960)
When you turn the key to check the oil level, what does the oil pressure gauge show - anything other than zero means your sender is bad.
Should look like this FWIW, this is a really clean car. I am the second owner. The dealer even commented on how nicely it was kept. All maintenance done. All Porsche parts used except the Bilsteins and IPD plenum. Tried as they might, they could not find anything else to recommend fixing on it, other than the issues that prevented it from starting last year. https://cimg9.ibsrv.net/gimg/rennlis...856db5227.jpeg |
Originally Posted by almico
(Post 19428042)
Of course the sender unit is bad! Good call. Is there anything else that's going to go to sh*t before this car hits 85000 miles? I'll take my '76 911S any day over this. I can't imagine what a new one would be like in 20 years.
FWIW, this is a really clean car. I am the second owner. The dealer even commented on how nicely it was kept. All maintenance done. All Porsche parts used except the Bilsteins and IPD plenum. Tried as they might, they could not find anything else to recommend fixing on it, other than the issues that prevented it from starting last year. https://cimg9.ibsrv.net/gimg/rennlis...856db5227.jpeg Not a hard job. It's along the right side of the engine bay and easily replaceable with a crowsfoot wrench. https://cimg3.ibsrv.net/gimg/rennlis...412244c85f.jpg |
Originally Posted by Petza914
(Post 19428057)
Not a hard job. It's along the right side of the engine bay and easily replaceable with a crowsfoot wrench.
I'm going to drain the oil tomorrow, change the filter and add 8 quarts to get a baseline. |
Originally Posted by almico
(Post 19428083)
I was waiting for an excuse to buy a set of crowsfoot wrenches. Thanks!!! Does that sending unit do anything else but control the gauge? Do we know if the computer use its output for anything?
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Originally Posted by Petza914
(Post 19428092)
Nope, just pressure reading to the gauge. On a 997.1 the oil temp and oil level are a combined sensor and unfortunately, it's so long and inserted from above the motor that there's no way to replace it without dropping the engine. They smartened up on the 997.2 and made the level sensor separate and changeable.
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Originally Posted by almico
(Post 19427696)
The question is do I buy the $500 worth of connecting hoses in advance?
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Originally Posted by jchapura
(Post 19428419)
It depends on if you want to minimize downtime. I had them all in hand when I changed my AOS. Almost assuredly they are brittle and at least one will break when disassembled.
And to repeat: this condition began on its own after driving a few days after a winter break of a few months. I had not changed the oil yet or did anything other than drive it. Let's talk parts: I was in the auto collision industry for 15 years. I've seen lots of parts. Lots and lots of parts. It became pretty clear, especially on older cars, that more frequently than not, a $90 aftermarket radiator for a Toyota Camry was the same exact part, made in exactly the same place as the OEM for $340. The OEM AOS is about $300. A Bilstein AOS is $63. If the OEM is lightyears better, I'm all for it. If both parts are made in the same place and just relabeled, I'd rather put the extra coin to better use. https://www.partsgeek.com/dltchy7-po... https://cimg4.ibsrv.net/gimg/rennlis...8308c8249.jpeg |
When the car is running is the oil fill cap extremely difficult to unscrew and remove? That's a good indicator of a failed AOS which results in excessive crankcase vacuum and why oil consumption and smoke go way up when it happens. Oil cap rest is a quick and easy one but not always conclusive. A manometer is the right way to determine if your AOS is bad or not.
It almost sounds like you had a rodent chewing on the plastic AOS hoses and some wires. Any evidence of that like droppings, next in the airbox above the air filter, etc? |
Originally Posted by Petza914
(Post 19428689)
When the car is running is the oil fill cap extremely difficult to unscrew and remove? That's a good indicator of a failed AOS which results in excessive crankcase vacuum and why oil consumption and smoke go way up when it happens. Oil cap rest is a quick and easy one but not always conclusive. A manometer is the right way to determine if your AOS is bad or not.
It almost sounds like you had a rodent chewing on the plastic AOS hoses and some wires. Any evidence of that like droppings, next in the airbox above the air filter, etc? I think I do remember the oil cap being hard to remove once or twice, and the curse words I used trying to turn it, when I've been adding oil. I'd rather not drive it if the AOS is bad. Also, I just remembered, on that first drive before I added the oil, I did hear a tapping...valve tapping most likely. It went away when I added the oil. So the oil was definitely low. And it went low quickly, like after 100 miles of driving it this year. |
OK then...I went outside with the idea of changing the oil this morning and noticed a few things. Did not start the car all day yesterday.
Lots of oil behind the alternator. Could not see any chewed lines or wires. Turned the key to ON and the oil pressure gauge went from 1 to 5 and stayed there. I pressed the clutch and it dropped to 2 and then went right back up and stayed at 5. https://cimg5.ibsrv.net/gimg/rennlis...ba0d720b5.jpeg Started the car to warm the oil a bit and got lots of smoke as it heated up coming from the headers: No check engine light, but it will throw a lean bank one and two and cylinder misfires if I drive it. Did that twice already in the past week. Misfires likely from oil entering the intake manifold. . |
Changed the oil. Pulled 7 qt, 6oz out including some of the filter oil. Car is dead level. After 7 qts it read:
https://cimg2.ibsrv.net/gimg/rennlis...18fdc70ec.jpeg I had not started the engine to circulate the new oil. I just did that, and now have to wait 29:58 minutes to check it again. Helluva system. No one at Porsche put the brakes on when some engineer decided that no one really needed a manual oil level check? Really!?. Off to road some coffee. Back later. Big thanks for holding my hand through this. Much appreciated. |
There is a plastic AOS hose that runs from the primary AOS at the front of the engine on that port side over to the secondary AOS (the one we all refer to as the AOS). The primary AOS is just a box with some plastic vanes in it that try to knock out some of the oil vapor (no membrane in it).
My guess is that the mechanic either cracked this hose or the oil filler neck hose when replacing your starter and that's where all that oil is coming from. You may be able to get a look at part of that hose from under the car at the front of the engine after removing the rear under tray. #10 on the left is the primary AOS I'm taking about and #7 is probably the hose they broke. https://cimg9.ibsrv.net/gimg/rennlis...39a11b6ce5.jpg |
Originally Posted by Petza914
(Post 19432273)
There is a plastic AOS hose that runs from the primary AOS at the front of the engine on that port side over to the secondary AOS (the one we all refer to as the AOS). The primary AOS is just a box with some plastic vanes in it that try to knock out some of the oil vapor (no membrane in it).
My guess is that the mechanic either cracked this hose or the oil filler neck hose when replacing your starter and that's where all that oil is coming from. You may be able to get a look at part of that hose from under the car at the front of the engine after removing the rear under tray. #10 on the left is the primary AOS I'm taking about and #7 is probably the hose they broke. |
But now that I’m thinking about it, a cracked external line would not account for the oil blowing through the combustion chambers and out the exhaust?
Come to think of it. I am not sure the smoke was coming from the exhaust. It just could be blowing out the line and pouring onto the header when the pressure gets high enough. Then again, the scanner did show misfires on most cylinders at least twice during the past two weeks, which could be caused by oil in the cylinders and fouling plugs? |
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