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BMW 3-Series (E90 E92) Forum
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oil on MAF
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01-31-2013, 05:28 PM | #1 |
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oil on MAF
i decided to clean my mass air flow sensor today cause my gas mileage been crappy. so when i took it out it was covered with oil. and i didnt have any engine light malfunction or anything. what could cause this.
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01-31-2013, 06:37 PM | #2 |
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New here and know little of the N54 motor yet (about to buy in soon!) but I'd guess turbo seals are potentially leaking oil. I don't know if that's a common issue on this motor or not.
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01-31-2013, 11:16 PM | #3 |
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That's not a maf. Thats a manifold pressure sensor and if you have an N54 then there isn't a Maf on the car. Plus oil in the intake is completely normal on all BMW engines. I've never seen a single one that wasn't at least coated in a thin coat. It's how the crankcase ventilation on these cars is. Totally normal.
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02-01-2013, 07:22 AM | #4 | |
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Quote:
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02-01-2013, 08:27 AM | #6 |
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Sounds like it would be worth pulling the plugs on your vehicle to see if any look really black. Might be a leaking injector(s) killing your mileage. I've heard of other people complain about bad mileage but was never able to verified it.
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02-01-2013, 08:40 AM | #7 |
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my spark plugs were replace at 32k miles and now im at 44k only have 12k on them
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02-01-2013, 11:21 AM | #8 |
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I think u misunderstood me. The reason I mentioned taking the plugs out is to see if you have a leaking injector. If so the plugs can turn very dark/black from all the extra fuel. May be a reason for low fuel mileage.
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02-01-2013, 12:38 PM | #9 |
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Wouldn't that trigger an OBD code for running rich on the O2 sensor ?
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02-01-2013, 12:39 PM | #10 |
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got it. ill take a look
Last edited by mcpcolas; 02-01-2013 at 02:45 PM.. |
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02-01-2013, 12:43 PM | #11 |
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Get an oil catch can. This is just typical vaporized oil blow by that's recondensed once it's far enough from the block and cooled off.
You'll find a similar skim on the inside of the intercooler |
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02-01-2013, 12:55 PM | #12 |
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leaky injectors would leave him misfiring in worst case scenarios, or give him a rough smokey startup in the morning
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02-01-2013, 03:00 PM | #14 |
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I'm throwing out scenarios. I've had injectors throw me for a loop and cause all kinds of crazyness. If you believe everything is easy and the same every time then I got some news for you. I've also seen cars running very bad and with crazy lean/rich mixtures throwing no faults. I've been on the BMW brand for 10+years now. The only thing I know is, just when you think you have seen everything you find something new.
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02-01-2013, 03:12 PM | #15 |
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It's typical to have oil in your intake. A lot of people run oil catch cans, BMS sells the most popular one and I've heard AR design should be coming out with a new one soon.
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02-02-2013, 09:33 AM | #16 | |
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