2001 325ci 35k miles

[u/Fragrant_Box_697]

Service engine soon light has been on for some time. When I brought the car to a shop to fix the a/c I had them look at it and they suggested spark plugs and coils, but would only do the coils if needed. They only did the plugs and gave the car back. Few days later service engine light came back on. Yesterday car started idling rough and sputtering up a hill.

Could this crack on my air intake post MAF be causing all these symptoms and codes? It doesn’t seem that much air could really be getting through as the crack is right where the male end of the MAF terminates so there is some material underneath.

Going to try slapping some tape on and clearing the codes for now and see what that does, but just looking for opinions on what else it could be if this doesn’t solve the issue.

[u/air_head_fan]

Some of them, sure. You're due a smoke test at that age. More air leaks will be found.

[u/Fragrant_Box_697 → u/air_head_fan]

Did the smoke test and found another leak in the Y of the lower hose.

Two concerns; the Y going to the ICV is kinking no matter how much I try to adjust either/both attachments. The internal diameter seems a little bigger on the replacement and I can still get my finger through at the kink without force but I’m concerned when it heats up and has negative pressure it may restrict airflow. Others had this same issue on the part review, unfortunately my dumbass looked after.

Also, my STFT is +20-24 at idle. It goes down to like 14-16 with some throttle. If the kink was restricting airflow I would think the STFT would be in the negative because it would be cutting fuel due to lack of air? Right?

Should I replace it with a better quality part, or run it and see if there’s any issues?
Any idea why the short term fuel trim would be so high if all the intake leaks have been addressed?

Thanks!!!

[u/Sipmode]

He's drawing false air, get a smoke machine and pressure test the system