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Old 10-16-2013, 01:05 AM   #1
3sge
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anyone have a MAF sensor I can borrow

Hey guys, I just bought a 2004 325i convertible. I'm getting the infamous 171, 174 codes. I'm having very minor rough idle problem and slight whistle noise. I changed the intake hoses and the problem is still there. Upon reading many threads about these 2 codes, the MAF sensor seems to be a very common problem. I was wondering if anyone has a spare that I can borrow so I can see if the MAF sensor was the problem or not? I'm in Fullerton but will meet you whereever you are thanks

Last edited by 3sge; 10-16-2013 at 01:05 AM.
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Old 10-16-2013, 12:47 PM   #2
Rick325i
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These thread might help you:
http://forum.e46fanatics.com/showthr...hlight=171+174

You could also try to clean out the MAF sensor, not sure if you've pulled code using a peake tool, I can offer to read yours if you want to drive to Rancho Cucamonga.
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Old 10-16-2013, 06:59 PM   #3
3sge
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Quote:
Originally Posted by Rick325i View Post
These thread might help you:
http://forum.e46fanatics.com/showthr...hlight=171+174

You could also try to clean out the MAF sensor, not sure if you've pulled code using a peake tool, I can offer to read yours if you want to drive to Rancho Cucamonga.
thanks for the help. I went to the smog check station today and got a pre test. I surprisingly PASSED with good numbers... However, since I reset my check engine light, I failed that part of the test. I'm hoping that after couple of days when the ecu is reset or whatever, the check engine light doesn't come on. Also, it seems that my MAF sensor is fine but it definitely seems like the DISA valve needs to be replaced as I hear constant hissing noise from that area.


IF ANYONE HAS A DISA VALVE YOU WANNA SELL TO ME, PLEASE CONTACT ME AT 714 - seven 2 6 - 06six nine
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Old 10-16-2013, 09:09 PM   #4
E40SICK
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i had those same codes .. for bank one and bank two.. it was my DISA valve. if i were you, id check that first. make sure nothing from that broke off and entered your intake..
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Old 10-16-2013, 09:10 PM   #5
E40SICK
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btw take your disa valve apart.. if the valve it self is ok i have a quick fix for you. PM me?
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Old 10-18-2013, 10:21 AM   #6
Rick325i
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Secret Fix?

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Originally Posted by E40SICK View Post
btw take your disa valve apart.. if the valve it self is ok i have a quick fix for you. PM me?
Why would you not just post and share to everyone whatever the "quick fix" is why the need to PM, is it a "top secret" fix?
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Old 10-18-2013, 07:24 PM   #7
E40SICK
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no not top secrete. one day i do plan on making a how to but i just wanted to make it easier for me to communicate with the OP
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Old 10-21-2013, 03:39 PM   #8
3sge
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DANGIT... I replaced my DISA valve with a perfectly good one but the check engine light ended up coming back on.... I'm still getting pretty rough idle. I checked my MAF sensor and unplugged it and see if my car runs any differently but it runs the same which means there is nothing wrong with the MAF sensor right?
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Old 10-21-2013, 07:07 PM   #9
E40SICK
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did you check the o-ring on the disa valve?
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Old 10-22-2013, 02:24 PM   #10
3sge
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Originally Posted by E40SICK View Post
did you check the o-ring on the disa valve?
ahh I think the o-ring might be the problem. I sprayed carb cleaner around the engine bay where there might be possible vacuum leak and the only time the idle changed was when I was spraying the DISA valve connection to the manifold. I'm gonna change out the o-ring today. I really really hope this is the problem for the p171, 174 code
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Old 10-22-2013, 02:30 PM   #11
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Quote:
Originally Posted by 3sge View Post
DANGIT... I replaced my DISA valve with a perfectly good one but the check engine light ended up coming back on.... I'm still getting pretty rough idle. I checked my MAF sensor and unplugged it and see if my car runs any differently but it runs the same which means there is nothing wrong with the MAF sensor right?
I may be wrong but if you unplug the MAF the car should die... I know if you have a bad enough one and unplug it it runs better, but my belief is if you unplug it the motor should die, I would go test it right now but I'm at school so I don't have my car, I'll do a little more research right now and check... I would try to clean it personally
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Old 10-22-2013, 02:41 PM   #12
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http://www.underhoodservice.com/Arti...g_methods.aspx
Interesting site... If you hear a whistle though, thinking about it, it is most likely an intake leak somewhere
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Old 10-22-2013, 02:48 PM   #13
E40SICK
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The o ring on the disa flattens out once you tighten it down. I used an o ring from a ford probe. I foget which. But if you search on google the part number will come up.
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Old 10-22-2013, 03:56 PM   #14
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O-Ring from Ford Probe

Quote:
Originally Posted by E40SICK View Post
The o ring on the disa flattens out once you tighten it down. I used an o ring from a ford probe. I foget which. But if you search on google the part number will come up.
It's this: Fel Pro gasket PN 35489 for a 1991 to 1994 Ford Probe

http://forum.e46fanatics.com/showthread.php?t=897595
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Old 10-22-2013, 04:16 PM   #15
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Yeah, if you unplug the mad it should die, that is what should happen if it is good
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Old 10-22-2013, 04:36 PM   #16
Rick325i
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Quote:
Originally Posted by 3sge View Post
ahh I think the o-ring might be the problem. I sprayed carb cleaner around the engine bay where there might be possible vacuum leak and the only time the idle changed was when I was spraying the DISA valve connection to the manifold. I'm gonna change out the o-ring today. I really really hope this is the problem for the p171, 174 code
When you replace the O-Ring, make sure you check all the Boots for hairline cracks, and since you're close to it, Clean TB and ICV if you can. Have Fun !!!
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Old 10-22-2013, 09:49 PM   #17
E40SICK
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there you go! lol dont forget to remove the old gasket if you do go the probe route.
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Old 10-23-2013, 02:28 PM   #18
3sge
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I just replaced the O ring and it was a perfect seal! car definitely has more low end torque and the virbration at idle got a LOT better. Unfortunately though, the service engine light is still on but I'm thinking it might take couple times of driving until the ecu notices a difference right? also, I couldn't clean the ICV because the clamp that is holding the lower intake boot (the smaller tube) is facing downward so there was no way I could fit a flathead or a socket to loosen the clamp ><
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Old 10-23-2013, 03:04 PM   #19
Rick325i
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Quote:
Originally Posted by 3sge View Post
Unfortunately though, the service engine light is still on but I'm thinking it might take couple times of driving until the ecu notices a difference right? ><
If it doesn't go away in about 20 miles of driving, I'd get it cleared at autozone, if not, you're more than welcome to come by my place to get it reset.
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Old 10-24-2013, 12:22 AM   #20
E40SICK
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for mine i had to push on the DISA unit itself as i tightened it to close the gap. the o-ring is pretty thick lol.
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