Help with codes P1500 P0175 and P0172 for my 2001 330ci, cleaned out icv and replaced intake tubes

[native solar]

OBD2 read 5.3 on maf so ive ruled that out but cant quite figure out whats causing this

[real crest]

What kind of scanner are you using and is that grams/sec or pounds/min?

And I assume when you replaced intake tubes, you’re referring to the two “elbows” that go from the maf to the throttle body? One of them has a t connection to a hard vacuum line that goes back towards the firewall. As a sanity check, how much of a pita was it doing the attachment from the bottom boot to the throttle body itself?

[native solar]

Using a Obd 2 and it’s grams/sec and yes those tubes and what do you mean by pita?

Ohhhh pain in the ass for removing the old tube, it was pretty difficult had to use both hands

[native solar]

Gonna try to get a smoke test to see if there’s any leaks tmrw

[real crest]

Usually I’d look for 3.5 g/s at idle for a MAF reading. But that’s not the whole story, there’s some more accurate testing you can do to confirm the health of the MAF. Link: https://www.e46fanatics.com/threads/testing-maf-sensor-how-to-do-it.617788/

Smoke test is also a good test - a leak in that intake boot is suspect. The reason I asked about the connection to the TB is because the hose connection sits deep against the TB and it’s extremely tricky to get the clamp on correctly. If it was easy to put the clamp on, it’s likely not seated correctly on the TB.

[native solar]

thanks for the help ill report later when i can go outside and not die from 110+ weather

[real crest]

Solid choice. Stay safe!

[native solar]

Got some live data here but not to sure what I’m looking at

[zealous stone]

GG @native solar, you just advanced to level 2! Chat more to level up and earn top roles!

[native solar]

Have noticed car jerks on deceleration and maf could be responsible for that

[real crest]

Ok that’s promising. From the link I provided, follow the instructions in post 1. Record airflow, rpm, intake air temp, and both fuel trims. Make a rolling start wide open throttle run. Grab your data points from that run to use in the calculator (link in post 15)

[native solar]

From what I’ve shown you what else do you think could be the cause

[real crest]

Either an intake leak or a faulty MAF