[BRD1234]

Hello E90Post members.
For the past about 4 weeks now I have been having the issue of my car upon start-up after it cooling down during the night sputtering and shaking uncontrollably.

I am waiting for my friend to give me back my BT Cable so I can go scan it but I have an error for my o2 sensors already.

After I rev the car just a small amount (1500-2500rpms) it calms down and the idle returns to normal.

Could that issue be my o2 sensors? I keep feeling like it could be my injectors gunking up after it cools down and revving it just cleans them off faster.

Thanks for any input ahead of time!

[Andrewah05]

Could be a number of things but you are on the right track, change the o2 sensors for sure, the shaking I believe is a result of carbon build up as many members will tell you on the forum, carbon cleaning is the way to go! However things like plugs, coils, and injectors can cause the shaky idle, I had my carbon cleaning done and I still have a little bit of shaky idling

[BRD1234]

Originally Posted by Andrewah05

Could be a number of things but you are on the right track, change the o2 sensors for sure, the shaking I believe is a result of carbon build up as many members will tell you on the forum, carbon cleaning is the way to go! However things like plugs, coils, and injectors can cause the shaky idle, I had my carbon cleaning done and I still have a little bit of shaky idling

I just did a carbon cleaning myself about 300 miles ago. After 102,000 miles and being the third owner I was surprised at how bad it actually was. Definitely felt a difference once I got it all put back together.
But yeah I'm about to change coils and plugs on the next fat paycheck I get.
Thanks for your help!

[Andrewah05]

No problem, let us no how things turn out!

[Miller335]

Try resetting adaptions with your BT cable now that your valves are clean.

[BRD1234]

Originally Posted by Miller335

Try resetting adaptions with your BT cable now that your valves are clean.

+1 good idea I never thought of that! Thanks!