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View Full Version : Bmw e36 FAILED SMOG @ 15mph



Beamerbmw
09-11-2013, 01:51 PM
Hello I recently purchased a 92 325i with a m52b28 swapped into it with m50 manifold an 3.5 MAF and injectors.

Failed smog @ 15mph by 200 points on the nox.. I will try to post pics


Po, who is on these forums may see this, got it to pass smog by 5 points. 780 out of a max 785.

A year and a half later it's at 1000 and 950

I'm wondering if you guys think there is a vacuum leak or it's running lean or if I should just use a bottle of heet, change oil, and make sure I get it warmed up better?

Thank you.

Eric93se
09-12-2013, 12:19 AM
There are 1000 threads on failed smog. Run a bottle of CRC GTP with premium, use the whole tank, then retest. Read the other threads, and yes vacuum leaks are #1 on tune-up list.