Failed CA Smog

[elbrack]

Hey so went to get the check done on my 1991 318is.

Failed emissions.


15MPH - FAIL

HC Measured - 135 FAIL
HC Max Allowed - 124

CO Measured - 0.34 PASS
CO Max Allowed - 0.78

NO Measured - 950 FAIL
NO Max Allowed - 754

25MPH - PASS

Car passed back in October of last year, so I'm not sure what is wrong.

Called my BMW Mechanic down in San Diego and he suggested cooking the cat to clear it out a bit. Wanted to get everyone else's first though.

[efficient]

Vacuum leak somewhere. Im having the same problem but with my friends 325i. We sprayed carb cleaner when the motor was hot and we found that the throttle body gasket was leaking.

[jlevie]

Failing at low speed and passing at higher speed is almost always intake leaks. Have a shop run a smoke test to find them.

[efficient]

Did you ever figure it out?