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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 02-11-2004, 08:34 AM   #1 (permalink)
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Besides a faulty 02 sensor, what else can cause a drop in gas mileage?
thanks in advance.
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Old 02-11-2004, 06:30 PM   #2 (permalink)
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Old 02-11-2004, 06:46 PM   #3 (permalink)
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-same again heavy foot............ lol

but if its not the 02 sensor and you dont think its down to petrol intake then then it could possibly be

1.head gasket possibly ?
2.bad catalytic converter .....(i know spelt wrong hehe)
3.piston rings ( which you dont want it to be haha)

if im wrong then please correct me someone !!!! (but would put money on 02 sensor or relay being duff
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Old 02-21-2004, 02:39 AM   #4 (permalink)
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um.... honestly it could be almost anything. Good thing to do first is to check for any leaks. These are hard to find because gas evaporates quickly, but you cant always smell it. Check out your spark plugs, wires, all of the above posts, injectors, there's a lot. Unless you know about cars let some one look at it and post whatever they say before you let them do anything with it.
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