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  1. #1
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    SMOG failure 88 325is

    I just bought an 88 325is and the owner didn't smog it before sale. It failed smog. I don't really want to go back to the owner bc I want to keep the car, but do you know what might help make it pass?
    Didn't pass on hydrocarbons (HCs) and NO (nitrous oxide?).
    1. I took it in cold. I heard that warming it up properly will make a big difference.
    2. It was recommended that I change the oil, air filter and put high octane gas in it.
    Any others??
    Help!!


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    bring the car in HOT!

    Were you close to passing? If you drive the car pretty hard before going to get a smog (make sure you warm it up properly first), the cats will heat up more and may make enough difference for you to pass if you were close.
    2002 M3 || 1994 LandCruiser "Canyonero"

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    Re: bring the car in HOT!

    At 15mph 1863 rpms, failed HC and NO
    measured max avg
    c02 14.18
    02 .47
    *HCs 168 114 31
    C0 .52 .73 .10
    *N0 1662 785 237

    At 25mph 1908rpm, passed but close on the HCs
    C02 14.7
    02 .11
    HC 88 20 88
    c0 .15 .61 .09
    NO 334 724 199

    The car has 129k, and passed 2 years ago, 3k miles ago. The fact that it passed at a higher level rpm makes me think that it really needed to be warmed up. Are these numbers close? Do you think warming it up might make it pass?

    ------------------------------------------------------------------------

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    VoltesV
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    Hard to say (m)

    But I would guess that it would. Don't hold me to that!!

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    Re: Hard to say (m)

    I'm having the same problem with my '87 535is. Here are some suggestions that I've found from others:

    - use premium gas
    - run a can of CRC Guranteed to Pass (12oz size) through it. Follow the directions.
    - make sure it has the correct spark plugs, fresh oil and filter change, new air filter
    - make sure the air flow meter is set properly
    - check all vacuum lines and intake bellows for leaks
    - check for leaks in exhaust
    - does it have an aftermarket catalytic converter? These are usually the problem. Most aftermarket cats don't last more than a few months. You may need to install a BMW factory cat. They aren't cheap, can run up to $1500 depending on the car. I suspect that based on your numbers, your cat is bad.

    Good luck.

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