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Old 10-04-2008, 12:22 PM   #1
neil1138
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safe to unplug MAF?

I think my MAF is bad so is there any way to test it? Like unplugging it and driving around? Just to see if the problem is still there? Thanks.
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Old 10-04-2008, 12:25 PM   #2
jeffro3000
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how will unplugging the MAF tell you if there's a problem with it or not???

will the car even run without the MAF?
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Old 10-04-2008, 12:27 PM   #3
issacsierra06
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whats going on with ur car first of all?? my car was acting retarded last year turning off and on ended up being cam position sensor after i did some research up on here
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Old 10-04-2008, 12:30 PM   #4
neil1138
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Are you serious? If I unplug the MAF, the car is going to run off some kind of safe mode or something and if my problem is gone, then I know it's the MAF. I just don't want to drop $300 on a MAF without knowing it's the problem.

I just want to know if it's safe and ok.

And I have already replaced ten things trying to find the problem. I don't want to troubleshoot here, I just want to know if it's ok to run with an unplugged MAF.
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Old 10-04-2008, 12:32 PM   #5
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my moms e39 needed a new MAF. the symptoms were random misfires, mild loss of power, and eventually the car would not idle. if your foot was not on the gas, it would immediately die.
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Old 10-04-2008, 12:33 PM   #6
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Quote:
Originally Posted by neil1138 View Post
Are you serious? If I unplug the MAF, the car is going to run off some kind of safe mode or something and if my problem is gone, then I know it's the MAF. I just don't want to drop $300 on a MAF without knowing it's the problem.

I just want to know if it's safe and ok.

And I have already replaced ten things trying to find the problem. I don't want to troubleshoot here, I just want to know if it's ok to run with an unplugged MAF.
im 99% sure unplugging the MAF will not diagnose your problem.

What is the problem you're having??
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Old 10-04-2008, 12:38 PM   #7
neil1138
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Look for my past threads called "jerky acceleration at 50mph". There's my problem, I thought it was fixed after I replaced my CCV but no... This BMW is turning out to be a hellhole. I'm about to the point where I want to say fvck this car, I'm done.

I've had my Indy shop look at it, the dealer look at it, and I've thrown multiple parts at it to try and fix it. The only things I haven't replaced are my MAF, cam sensor, and O2 sensors
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Old 10-04-2008, 01:18 PM   #8
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Quote:
Originally Posted by neil1138 View Post
Look for my past threads called "jerky acceleration at 50mph". There's my problem, I thought it was fixed after I replaced my CCV but no... This BMW is turning out to be a hellhole. I'm about to the point where I want to say fvck this car, I'm done.

I've had my Indy shop look at it, the dealer look at it, and I've thrown multiple parts at it to try and fix it. The only things I haven't replaced are my MAF, cam sensor, and O2 sensors
My question to you would be have you tried cleaning the MAF with MAF cleaner, I would suggest that before you replace the one you currently have in your vehicle. Its a real easy DIY, AutoZone or any auto parts store will have MAF cleaner fluid. Simply remove the MAF, spray it completely wait for it to air dry completely and re-install it. This should give you and indication of whether or not your MAF is a part of the problem. My only other question is how many miles you have on your vehicle? Just my two and a half cents worth. Happy Motoring...
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Old 10-04-2008, 01:21 PM   #9
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http://forum.e46fanatics.com/showthr...824&highlight=
Try that, the shop i took it too said that my software was out of date...
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Old 10-04-2008, 02:29 PM   #10
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You can start the car without the MAF pluged in and it will run fine but you can not drive it like that.
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Old 10-04-2008, 02:32 PM   #11
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did you even try cleaning the maf with crc maf cleaner?
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Old 10-04-2008, 02:57 PM   #12
neil1138
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Well I just got back from walmart and I thought I would check and see if they had CRC MAF cleaner, they did not. So I finished my shopping and took the twisties back home, (twisty roads in oklahoma?, yeah there are some) and she drives like a dream! Before I left, I checked the car out, topped off my power steering fluid and checked the MAF, and somehow, the problem isnt there anymore. I just dont know guys.

The only things left that I havent replaced are the:

MAF
cam sensor
crank sensor
O2 sensors
fuel pump.

I've pretty much thrown a lot of parts at it in the past 6 months; CCV, spark plugs, fuel filter, and coil packs. I'll clean the MAF but im kinda hesitant because I've heard horror stories about how after cleaning, cars wouldnt start and so forth. IMO, if it aint broken, dont fix it. So for such an expensive thing as the MAF, somebody here really has to persuade me to clean that. Later
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Old 10-04-2008, 02:59 PM   #13
neil1138
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oh and to Miko 10: I already had the dealer reflash my ECU and that didnt help the problem. And I think that problem is for the ZHP's, not regular 3's.
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Old 10-04-2008, 03:04 PM   #14
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Yeah, unplugging you maf will be fine. i've done it before to diagnose problems, and i've driven like that. It reverts to factory software and fuel maps and **** so i can't adapt to the current environment but it basically runs on what it thinks the environment is. Sometimes this works and sometimes it doesn't.
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Old 10-04-2008, 04:53 PM   #15
dave330i
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Quote:
Originally Posted by neil1138 View Post
Are you serious? If I unplug the MAF, the car is going to run off some kind of safe mode or something and if my problem is gone, then I know it's the MAF. I just don't want to drop $300 on a MAF without knowing it's the problem.

I just want to know if it's safe and ok.

And I have already replaced ten things trying to find the problem. I don't want to troubleshoot here, I just want to know if it's ok to run with an unplugged MAF.
I had the same problems...I found it to be my MAF, I went to aboveallmotorwerks.com and they have it for $206 shipped, I did ALOT of looking online, it is the same one as the one BMW will sell you Siemens VDO.. I have also heard rumors that the Hyundai Sonata uses the same one and it is like $155 or 185 burt I have just seen that on some threads...bimmerforums I think had a write up
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Old 10-04-2008, 05:19 PM   #16
neil1138
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^^^ more info on the hyundai part? If it's the same part for less, I'm all over that.
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Old 10-04-2008, 05:24 PM   #17
Chris C
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Quote:
Originally Posted by dave330i View Post
I had the same problems...I found it to be my MAF, I went to aboveallmotorwerks.com and they have it for $206 shipped, I did ALOT of looking online, it is the same one as the one BMW will sell you Siemens VDO.. I have also heard rumors that the Hyundai Sonata uses the same one and it is like $155 or 185 burt I have just seen that on some threads...bimmerforums I think had a write up
I wish I had known about this. I went the aftermarket route for the MAF and it cost me a little under $100.00 shipped. I would have preferred OEM but when I was looking for the part it was about $300.00 or so. Fortunately, I haven't had any problems with the aftermarket MAF. I posted about it a while back in the following thread:

http://forum.e46fanatics.com/showthr...&highlight=maf
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