Car will intermittently shake when stopped after driving (when put in park)

boomwoss_191889
Mon, 16 Dec 2024 09:28:14 +0000
Maintenance/Repairs

Hey everone!

We have an issue with our 2015 MB c200d-

It always starts OK and it drives well but we have an issue with intermittent shaking after being driven for a while. It doesn’t always happen and we can have a full good week with no issues, but we will sometimes experience shaking when we come to a complete stop and put it in PARK. We can sit there with the brake down after a good ride with no shaking at any point, but as soon as we put it in park it could start shaking. My best guess is that it’s misfiring, but what do I know honestly

It has never happened while the engine was cold!

We have seen smoke only once out of many, my best guess is it was white as it was dark out

I’ve checked the oil and coolant, they both look just fine… No milky oil and coolant looks and smells fine (I checked these as I’m aware a blown head gasket can cause a leak, right).

Fuel economy seems to be just normal(satisfying), but we recently had a full service on the adblue system + new much needed tires, so fuel economy is hard to say if it has changed recently, I would say it hasn’t.

So it seems to me it only happens at operating temperature and when the RPM drops when putting it in PARK. We HAVE experienced it shaking/misfiring under a whole short trip after coming home from work, sitting shortly in PARK and continuing the drive to a store nearby.

Any ideas? If this was a leak due to a head blown gasket, wouldn’t it rather happen when the engine was cold rather than when it’s running hot? Maybe a faulty fuel injector?

Any feedback is greatly appreciated, thank you!

20 posts - 9 participants