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SMOG FAILURE - CALIFORNIA
1996 BMW Z3
July, 7, 2009 AT 8:18 PM
Engine Performance problem
1996 BMW Z3 4 cyl Two Wheel Drive Manual 111000 miles
passed the following:
(I tested extremely low for all of the above).
I failed NO (PPM):
15 mph (1982 RPM): 459 (allowed) 1065 (tested)
25 mph (1997 RPM): 746 (allowed) 278 (tested)
My first thought was cats, but the disparity between tested scores vs. Tested RPM has me thinking something else. O2? ECV?
Thanks in advance for the input.
By the way, drove on the freeway at 3500 rpm for an hour prior to the test.
FOUND 741 RELATED QUESTIONS
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Wont Pass Smog, Transmission Shifts Bet
July, 8, 2009 AT 4:35 AM
NOX can often be high due to carbon deposits, I have had success with high NOX cars by running water in the intake. It will clean out the carbon and lower the emissions. Do it slowly, it takes about a half gallon.
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