[eamon]

Hey guys

Recently, about a couple months ago, I noticed my car having rough starts.
Felt like the power was there, but the car would start jerking (like hiccups) even while reversing for about a minute or two. After a minute of driving it seems to stop.

I didn't think much of the situation until a couple weeks ago when I noticed a little bit of smoke coming out of my tailpipes even before the car fully warmed up. The smoke has worsened and I can see it at night in my rearview when I give it gas if there is a car behind me with their lights shining.

And most recently, I left my car idling for 15 minutes and it started shaking violently and a "service engine soon" light came on, almost felt like it was spitting or cutting out power every couple seconds. As soon as I went to drive it continued jerking for 5 minutes. I had tried turning it on and off.

What could the problem be?

I had sparkplugs, oil, and basic maintenance completed only a few thousand miles ago.

Edit:
Extra details- Mods- Vishnu tune on map 1 and muffler delete, that is all
No codes except for the time my car idled for 15 min

[rismo]

Shaking -> Either a dying HPFP or injectors/plugs/coils
Fumes -> Turbo's might be leaking but could also be caused by gasket issues around your engine.
As you have fumes during acceleration the chance is there that is caused by your turbo's.

What kind of oil do you use? I have had issues in the past by using BMW certified but too thin oil (0w30 and 0w40) and after using 5w40 again my smoke issues went away.
Also check if you have either white-is or black fumes and if you have oil residu around/in your exhaust tips.
half burned oil = white-is
burned = black BUT if "pure" black oil is dripping of your exhaust this could indicate that oil is leaking after your cylinders -> Possible turbo seals.

Anyway, dealer/mechanic time.... but check your oil type!

[Jeff@TopGearSolutions]

If you throw a Service engine soon light or any CEL you have codes. Not all generic scanners or code readers can read them though.

We are all just guessing but it sounds fuel related. Injectors, HPFP or LPFP.

[eamon]

Originally Posted by rismo

Shaking -> Either a dying HPFP or injectors/plugs/coils
Fumes -> Turbo's might be leaking but could also be caused by gasket issues around your engine.
As you have fumes during acceleration the chance is there that is caused by your turbo's.

What kind of oil do you use? I have had issues in the past by using BMW certified but too thin oil (0w30 and 0w40) and after using 5w40 again my smoke issues went away.
Also check if you have either white-is or black fumes and if you have oil residu around/in your exhaust tips.
half burned oil = white-is
burned = black BUT if "pure" black oil is dripping of your exhaust this could indicate that oil is leaking after your cylinders -> Possible turbo seals.

Anyway, dealer/mechanic time.... but check your oil type!

I've been taking it to the dealer for oil changes as its still under warranty at 47k miles. I thought it was 5w-30 oil though. I also had my hpfp replaced less than 10k miles ago.
What do you mean by white"-is?"
I can't tell if the fumes are white or greyish but the exhaust tips are completely black inside and pretty dirty on the outside.
I also noticed a very slight clicking or tapping sound coming from around the car, not sure if its relevant.

[eamon]

Originally Posted by Jeff@TopGearSolutions

If you throw a Service engine soon light or any CEL you have codes. Not all generic scanners or code readers can read them though.

We are all just guessing but it sounds fuel related. Injectors, HPFP or LPFP.

I have a PROcede tune on, I'm not sure, but I think it automatically clears the codes.
I also had my hpfp replaced just a few thousand miles ago after getting long cranks, I think.

[j1gilles]

Its infector(s) probably.... Scan it

[rismo]

Originally Posted by eamon

I have a PROcede tune on, I'm not sure, but I think it automatically clears the codes.
I also had my hpfp replaced just a few thousand miles ago after getting long cranks, I think.

Procede will not clear engine issues, only tuner codes.

[eamon]

bump

[rismo]

answers are given: Injectors, plugs,coils, but in case you have already replaced the HPFP, could be your injectors..
Have you inspected your plugs?

[eamon]

Originally Posted by rismo

answers are given: Injectors, plugs,coils, but in case you have already replaced the HPFP, could be your injectors..
Have you inspected your plugs?

I'm thinking it is either turbo or injector related.
Plugs were replaced 2k miles ago.
I was kind of wondering if it would be a full turbo replacement or just the seals.

The only thing that worried me was when a tech I ran into told me it could be the seals for the cylinders which would be considered as a head job and take 20+ hours to fix. Going to take it in the next couple weeks.