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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 03-30-2009, 04:52 PM   #1 (permalink)
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Question Calling All Bimmer Experts!!

How you doing...I have a 93 325i..and i recently failed the smog test go my baby is in the garage..I need to know all possible problems so i can pass the smog test...i already changed the spark plugs, oil, and air filter...the last is the cats and o2 sensors..Will this be last thing??..are there any other possibilites that i am missing???..Any help will be appreciated..
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Old 03-30-2009, 05:23 PM   #2 (permalink)
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How many mi.? IDK how much the O2 sensors effect the fuel charge on an OBDI car. Are you throwing any CEL codes? If you are, fix those first. High hydrocarbons could be corrected by a new cat. Just my $.02.
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Old 03-30-2009, 05:58 PM   #3 (permalink)
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Im not getting any codes..no check engine light at all..just failed the smog test..and i am running with that guarentee to pass stuff in my tank and am going for a retest tomorrow..not to confident that it will pass tho cuz of the cats..
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Old 03-30-2009, 06:52 PM   #4 (permalink)
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Make sure the car is warmed up good, 5mi at highway speeds might be helpful.
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Old 03-30-2009, 10:22 PM   #5 (permalink)
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I made the mistake last time....not letting the cats warm up..but is there anything im missing tho??...or are the cats going to be the difference maker??
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Old 04-02-2009, 08:41 PM   #6 (permalink)
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could be a fuel injector leak.

you could possibly have a fuel injector leak. older model bimmers are partial to that problem. when you changed the plugs, were they black and reaking of fuel? i know that if you are running rich in the fuel to air ratio then you will fail a smog.

hope it helps.
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Old 04-04-2009, 05:40 PM   #7 (permalink)
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Originally Posted by acid86 View Post
you could possibly have a fuel injector leak. older model bimmers are partial to that problem. when you changed the plugs, were they black and reaking of fuel? i know that if you are running rich in the fuel to air ratio then you will fail a smog.

hope it helps.
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