S3 8V shaking while idling

[samjekel]

So my check engine light recently came on. I checked the codes with OBDeleven and I got the codes P030000 (engine misfire detected, which gives notices for all 4 cylinders) and p001100 (A camshaft position [bank 1], timing over advanced). After a minute of idling, the engine and car will start to shake. I recently added a stage one integrated engineering ecu tune and a integrated engineering dsg tune.

From Google search it seems to either be a spark plug issue or a cam issue.

I'm not to excited about taking my car to the shop after only a few weeks of owning it, does anyone have experience with a similar issue and know how it was fixed?

Car is a 2015 s3 8v btw.

Thanks in advance.

[TheMysticWizard]

How many miles on it?

I'd throw a new set of plug in it, see if that helps your misfires. Easiest and cheapest thing to do, worth a try.

Cam code makes me uncomfortable tho, who knows maybe the plugs will take care of it, if not... time to find a good indy mechanic imo.

[Phoenix Fab]

I hope you are having a nice day. You may want to be sitting for this....

There are so many things it could be, it would be damn near impossible to diagnose THIS kind of issue in a forum. Dont get me wrong, there are plenty of things that CAN be diagnosed on a Forum. However, this could be the tune, or a vacuum leak, it could be a fowled injector, could be bad gas. I would suggest a good indy shop and don't throw money at it hoping for a fix.

[Sv2k]

Tune it back to stock. I doubt it’s the tune, but should be your first step regardless if you try to troubleshoot yourself or take it somewhere.


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[aaronc7]

Sounds like intake cam is going full advance and ECU can't control it. Would point towards the sprocket or VVT solenoid.

[samjekel]

I appreciate the input everyone. Here's an update from what I learned.

After doing some research, it seems with my obdeleven I can check how many misfires per cylinder per 1000 revolutions. If the misfires are spread to every cylinder that would likely be a cam, vacuum, or solenoid issue. If the misfires are mostly on just one or two of the cyls, then it's a spark plug or ignition coil issue.

With this in hand, I went out to my car to do my best to diagnose the shaking. To my surprise everything was working perfectly...... Which is super relieving but next time it happens I may be able to figure it out.

[aaronc7]

Vacuum leak probably no effect on these cars as they are MAP or speed density based. If the intake cam went full advance, it would create a ton of valve overlap, similar to an aggressive V8 cammed setup, which results in rough idle condition, misfires at idle etc.

Hopefully it's just a fluke, but something to keep an eye on for sure.

You can probably monitor intake cam position commanded vs actual in OBD11 as well. Commanded is probably called "set point". The check engine light/code appears to be associated with that. A condition where the car is commanding a certain value but can't achieve it for whatever reason.

[samjekel]

I'll see if I can check that in the live data.

The misfires at idle do still happen occasionally, but it seems only if it's idling and didn't get to drive much (like when I change parking spots at work). It does not seem to misfire ever after the car gets to stretch it's legs. When this poor idling happens it is across all cylinders at a rate of 40-60 misfires per 1000 revolutions. Which according to my research would point to it not being a speak plug or ignition coil issue as those would be very unlikely to all fail at the exact same time.

[PaperLion]

PCV valve?