CA. Smog Failed 325is - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-17-2007, 02:48 PM
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CA. Smog Failed 325is

Hi I have a 94 325is and it has 150k on it, runs real good. I am trying to gets some Ideas as to why I failed the low idle test the max Hydocarbon allowed is 250 mine was 326. The high rpm test was ok. The car has a new cat eveything was checked, plugs,air filter, o2 sensor ect ect. Any Ideas on what to look for would be a big help. Thanks
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#2 (permalink) Old 04-18-2007, 11:41 PM
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bad plugs are usually the culprit of high hc levels..

or it can be burnt exhaust valves, slight vaccuum leaks, dirty/leaking fuel injectors, clogged fuel filter or bad fuel pump(all lead to poor fuel pressure, and can cause elevated HC lvls)

can be tons of things but bad plugs are the easiest to check for, and go from there.

have your compression checked, as well.

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#3 (permalink) Old 04-19-2007, 12:43 AM
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Thanks man I needed to hear something I have 2 months to get it done, I will start with the plugs and do a compression and leak down test. I hope its something fairly simple, it runs perfect does not use oil or smoke at all, coolant is always spot on, man It should have passed, the 02 sensor is around 5 months old, I need to get a scanner to make sure its working right. Thanks again and keep the ideas coming.
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#4 (permalink) Old 04-19-2007, 01:09 AM
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With my car I believe I failed once, but I revved it for a little bit before I went in the 2nd time, after the guy told me to do that, then I passed, that was when I first got the car and I was fine 2 years later hmm.

+1 on the plugs, fuel filter



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#5 (permalink) Old 04-19-2007, 10:18 AM
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Yep thats what I tried. I drove it hard for a good 30 min. Then took it in and let it run while I waited, then just prior I held the rpm's @ 3000 for a good 2 min. and it still fuc_ing failed, my 92 ZR-1 blew cleaner, Its a bitchin car and always been rock solid so I need to get this whipped. Are the 94's OBD1 or 2?
Is there a chip made to replace the stock one that may help with the A/f ratio, there is a dyno tune shop close by, I could always have it tuned and see what it is really doing. Hmmmmm. Thanks
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