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01-03-2012, 03:14 PM | #1 |
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Oiled air filters and MAF sensor/Idle control sensor
So ive been using oiled air filters since my break in. Been about 20K miles now and I noticed that when i rev the car lightly in neutral (fully warmed up) the RPMs drop slowly around 1.5-1K for a second then drop to idle. I discintly remember before the RPMs would drop right to idle. My buddy said it could be due to my use of oiled air filters gunking up the MAP sensor or Idle control sensor/valve. Has anyone heard of this before?
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Last edited by nusevad; 01-03-2012 at 03:32 PM.. |
01-03-2012, 03:32 PM | #3 |
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ok, would oil filters mess with a MAP sensor over time?
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01-03-2012, 03:56 PM | #4 |
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No, MAP sensors are based on air pressure so it doesn't have an air flow reading element like a MAF. Oil can coat the MAP and it wouldn't make any difference.
I don't know about the Idle control sensor though or if that can be affected. |
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01-03-2012, 03:57 PM | #5 |
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please read OP's?
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01-03-2012, 04:44 PM | #7 |
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A filter would have to literally dripping wet with oil for this to happen.
As long as proper cleaning/reoiling procedures are followed - this will never be an issue.
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01-03-2012, 04:51 PM | #8 |
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OOPS saw he meant Map. I'll leave the link up anyways.
Here is what K&N has to say about oiled filters and maf sensors. http://www.knfilters.com/maf/massair.htm |
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01-03-2012, 05:27 PM | #9 | |
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I've had K&N oil destroy 2 MAF sensors on a previous car. They ran fine prior to changing the filter. After install of the K&N and driving on it a while, the car started running very bad. Hesitation on throttle and low boost. Diagnosed as a bad MAF sensor. After taking the sensor out, you can see the intake tract and sensor covered in oily residue from the K&N. Put in a new MAF and it was fine for a couple of months then it happened again. Installed another MAF, ditched the K&N and never had a problem after that. I'll never run an oiled filter on a MAF equipped car again. |
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01-04-2012, 12:02 AM | #10 |
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If thats not the issue, then does anyone know why my revs linger around 1.5K-1K when i lightly rev it in neutral?
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01-04-2012, 06:56 AM | #11 | |
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01-04-2012, 11:32 AM | #12 | |
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01-04-2012, 12:18 PM | #13 |
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01-04-2012, 12:41 PM | #14 |
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There's different kinds of MAF sensors. I am referring to the hot wire MAF sensors from the mid to late 90s Nissans and Toyotas like the 300ZX, 240SX, Supra etc. On these cars, the air filter is mounted directly to the MAF sensor housing.
As mentioned before, the oil is not an issue with the MAP sensor on the M3. Last edited by Z K; 01-04-2012 at 12:48 PM.. |
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01-05-2012, 11:49 AM | #17 |
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I've read that due to emissions, but am not sure why. Also for engine not to stall from high revs. Or a combination of the 2 . I HATE rev-hanging too, so you're not alone. And there's nothing we can do without voiding the warranty, so I just live with it. Take care.
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