Just bought a 2008 Turbo with 76K miles - blue smoke after hard accels
10-09-2018, 05:01 PM
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Just bought a 2008 Turbo with 76K miles - blue smoke after hard accels
Hi, After lurking and looking at Cayennes for a while I bought a 2008 Turbo with 76K miles. After driving it home (from Philly, PA to Ann Arbor, MI) I got the CEL - with a P000C and P0018 codes. Cleared it but it came back. Took it to an indy mechanic and he replaced the cam shaft position sensor and the crankshaft position sensor. The service cost ~$1100 and seeing as I'd got the price down on the initial purchase by $900 I guess I feel fine about that. Except.... As the indy had it I asked him to do an oil change. He used Mobil 1. Ever since then if I get on it and get the turbo to 0.4bar or higher then on the next accel after that I get a lovely puff of blue smoke out the back. (I'm moving from a Chevy Volt to this beast - so I don't really want to burn oil as well as gas!!!).
What are your thoughts on addressing this? Does it fall within the "1 quart per 800 miles" guideline? Is there something that might have happened during the cam and crank sensor replacement that might have caused this? Is there something with the oil change that might have caused this? I'm thinking that maybe I should go up a notch on viscosity? Or if it is a coincidence and not related to the sensors or the oil change then what should I look at? Is there any service I can do related to the turbo that might address this?
I've also heard stories about not giving turbos "cool down" time before switching off can cause issues. Yikes. Are those issues fixable?
Many thanks from a "slightly worried" noob.
What are your thoughts on addressing this? Does it fall within the "1 quart per 800 miles" guideline? Is there something that might have happened during the cam and crank sensor replacement that might have caused this? Is there something with the oil change that might have caused this? I'm thinking that maybe I should go up a notch on viscosity? Or if it is a coincidence and not related to the sensors or the oil change then what should I look at? Is there any service I can do related to the turbo that might address this?
I've also heard stories about not giving turbos "cool down" time before switching off can cause issues. Yikes. Are those issues fixable?
Many thanks from a "slightly worried" noob.
Last edited by jdh2550; 10-09-2018 at 05:15 PM. Reason: change title
10-09-2018, 06:36 PM
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Dear Noob,
Not to worry. The puff of smoke you see is usually a sign that there is some oil in the downpipe for the port side intercooler. When you push the fun pedal, a bit of that oil is streamed along with the air going through the intercooler - and sent to the intake. Puff of blue smoke is the result. Usual fix - (and there are various threads on it) - is to disassemble and clean out the pipe and the intercooler. Then when you get an oil change - draining that pipe is part of the fun. Mobil-1 Euro formula is fine for your turbo. It's unlikely that the cam and crank sensor replacements have any effect on this - unless some of the plastic plumbing under the hood suffered from age and being moved (the accordion-like pipes like to crack when they get old..) You might do a search on "catch-can" (I think you may have to be a paid user to do an in-depth search) - I know the oil issue on turbos has a number of people advocating adding one to the side that likes to accumulate oil (it accumulates it on the one side because the engine crankcase is vented to that side..)
The turbos on the Cayenne are water cooled. The old "turbo cooldown" goes back to oil cooled turbos which would coke the oil in the bearings if shutdown when red hot. That's not an issue with a Cayenne - the turbos are one of the least troublesome parts of the car.
Not to worry. The puff of smoke you see is usually a sign that there is some oil in the downpipe for the port side intercooler. When you push the fun pedal, a bit of that oil is streamed along with the air going through the intercooler - and sent to the intake. Puff of blue smoke is the result. Usual fix - (and there are various threads on it) - is to disassemble and clean out the pipe and the intercooler. Then when you get an oil change - draining that pipe is part of the fun. Mobil-1 Euro formula is fine for your turbo. It's unlikely that the cam and crank sensor replacements have any effect on this - unless some of the plastic plumbing under the hood suffered from age and being moved (the accordion-like pipes like to crack when they get old..) You might do a search on "catch-can" (I think you may have to be a paid user to do an in-depth search) - I know the oil issue on turbos has a number of people advocating adding one to the side that likes to accumulate oil (it accumulates it on the one side because the engine crankcase is vented to that side..)
The turbos on the Cayenne are water cooled. The old "turbo cooldown" goes back to oil cooled turbos which would coke the oil in the bearings if shutdown when red hot. That's not an issue with a Cayenne - the turbos are one of the least troublesome parts of the car.
10-10-2018, 02:50 PM
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So I took this information to the indy and he said that he felt all these things weren't going to solve the underlying problems and he thinks the turbos should be replaced... That's about a $6K job - and ain't gonna happen...
Any thoughts on what I should do?
Any thoughts on what I should do?
- Ignore it
- Clean things out
- Install a catch-can
- replace the plumbing
- next oil change go up a bump in viscosity
- All of the above (excluding #1 of course)
10-10-2018, 03:02 PM
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First - find a new indy. and do #2 and #3. You want an indy who actually knows Cayennes, this one insisting on bad turbos obviously doesn't.
You might also consider changing the diaphragm in the Air-Oil-Separator, although that usually makes a honking noise when it goes bad.
Reading material:
https://rennlist.com/forums/cayenne-...nd-y-pipe.html
https://www.6speedonline.com/forums/...n-install.html
You might also consider changing the diaphragm in the Air-Oil-Separator, although that usually makes a honking noise when it goes bad.
Reading material:
https://rennlist.com/forums/cayenne-...nd-y-pipe.html
https://www.6speedonline.com/forums/...n-install.html
10-14-2018, 04:14 PM
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Mmmm. Not to let my complete ignorance show. But where exactly is this hose I want to drain? Is there a step by step anywhere?
Do I tackle this from the top? Or the bottom?
Do I tackle this from the top? Or the bottom?
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10-14-2018, 04:25 PM
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Bottom. Look at your car from the front, you can see ICs behind the outermost grilles. It's the one on the RIGHT if you're looking at the car from the front. (Driver's side if you're in the US)
Jack up the car (front is enough). Put down the plastic protection tray(s) and disconnect the bottom hose from the driver's sice IC. Drain. Reconnect. Put everything back together. That's it.
And install a catch can (look for the thread).
Jack up the car (front is enough). Put down the plastic protection tray(s) and disconnect the bottom hose from the driver's sice IC. Drain. Reconnect. Put everything back together. That's it.
And install a catch can (look for the thread).
10-14-2018, 06:39 PM
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Hmm. Disconnected hose and drained a small amount of oil. Took it out for 5 mile test drive but still have smoking. Do I need to drain lC as well? Will I need to remove the IC to do that?