2003 955I Possibly running to rich

[Wilky]

Folks, what would change over time to cause engine to run to rich. Mainly when starting from cold after not having been for a couple of days.

I have no fault codes. I'm thinking either 02 sensor or stepper. Thoughts anyone. Runs TOR muffler and the modified map to suit.

cheers
Wilky

[orange99]

Dirty Air Filter?

[JoeDirt]

Folks, what would change over time to cause engine to run to rich. Mainly when starting from cold after not having been for a couple of days.

I have no fault codes. I'm thinking either 02 sensor or stepper. Thoughts anyone. Runs TOR muffler and the modified map to suit.

cheers
Wilky

When you say "rich"... does it smell like it has been flooded or it's rev'ing too high?

Do your symptoms go away after it is warmed-up?

[SteveFord]

Check the hoses that go onto the IACV and if the rubber ends have fallen apart, replace them with 7mm silicone vacuum lines.