tis66

Hi,

2007 BMW 530i E60 - 116000Kms

I took out my MAF sensor for cleaning the other day, and it doesn't look like the Siemens VDO sensor (BMW part no: 13627520519). My one has a different BMW part no: 7 547 822 02 and the 'hot air' bit is different from the Siemens one.

Anyone know if this is the correct part, or if it's a legit BMW part? I've attached some photos of the sensor.

Problem with the car is that when I shift from N to D and hit the acceleration immediately then the car will stall (as if the computer is too slow than my foot???). On some random occasions (3 times already), the car would lose power when down shifting in auto mode.

I've cleaned the sensor & replaced the air filter, but still able to replicate the stalling problem. If I hit the acceleration gently then the car is fine.

Thanks!

seanjordan20

If it still happens when you take it out and drive then your problem is not the MAF. Are you getting an error on the MAF? If not then your MAF is good and working properly. If you want what you looked up just for piece of mind then buy it and put it in. If your car is still not working with the MAF removed then you might have a vacuum leak.

tis66

Thanks Sean. There were no error codes reported. I'll give it a try with MAF sensor removed. Is it safe to do so? How to tell if there's a vacuum leak? Can you please point out the parts (vacuum) that need to be checked? Thanks again for your input.

seanjordan20

The only difference you will see is your gas mileage go down. No need to worry some people drive without it for a while. Do you have any errors on your car. You can google ways to find vacuum leaks. Its easy. Does your car shake?

E60I

If you have not done it already, I would suggest doing the following:

1) Clean or change the air filter/housing.
2) Check the spark plugs
3) Check for leaks in throttle body and clean it.
4) Replace ignition coils
5) Change to higher octane from higher tier gas station like Chevron "Techron".
6) Replace fuel filter (under your back seat).
7) Do an oil change with correct oil and filter.
8) Remove and inspect all fuel injectors.
9) Make sure the fuel line (connected to the fuel rail under the hood) is not leaking.
10) Check to make sure the transmission fluid is not leaking.
11) Make sure your oil and gas cap are sealed.

Trouble shooting is not fun! That's why I preach and practice preventative maintenance.

Good luck! :-)

tis66

Thanks for the input guys.

Stupid question, do I remove the MAF sensor and leave it open then take it for a test drive, or do I just unplug the cable?

@E60I - I've replaced the air filter but it still has the same issue of stalling if I rev the engine way too quickly.

I saw on youtube that you can use soapy water and spray it around the intake manifold to find out the vacuum leaks. I might give this a try instead of using carb cleaner. Unless you guys think it's a bad idea to use soapy water?

Cheers

E60I

By the way, your MAF sensor does not look OEM like the one I replaced a few months ago; I had the similar symptom you described after I replaced my starter. My car is a 2006 530i (N52 engine).

twh

tis66, have a look here: Temperature sensor, intake air 7547822 | BMW 13627547822

You can take a part number and see where it used. I assume your car is defined by BMW as a European model, right hand drive.

I picked a car that I think is close to yours: Intake muffler/Filter cartridge/HFM | BMW 5' E60 530i N52 Europe

That picture is a temperature sensor and not a MAF sensor. I think also that the MAF is both a MAF and temperature sensor in one package. I'm guessing that BMW can get away with a temperature-only sensor in some markets. I don't know what your car had originally and I don't know if the engine computer just knows what is attached and adjusts accordingly. But, that temperature sensor is inexpensive if you want to just get one and see what happens.

tis66

Hi guys,

Thanks again for the input.

I have tried removing the MAF sensor (tried both unplugging the cable and completely removed the sensor), and the car would still stall if I quickly step on the gas:
* While on N - step on the gas quickly (<2000 rpm), the car would stall
* Shift to D and immediately step on the gas (not even fully pressed), the car would stall.
* Give about 1 second before stepping on the gas, the car drives perfectly.

Is this normal?

The car usually shakes when it's a very cold start e.g. after 1 week in the garage. It would shake for about less than 1 min. and would go idle as per normal.

I suspect it could be a vacuum leak, so I sprayed soapy water around the engine area incl. the intake manifold (I assume it's the one with BMW spelling on it) but I couldn't find the leaks.

Can anyone please point out where I should spray about?

@TWH - the car is Australian version and it's right hand drive. I'm not sure how to take out just the temperature sensor? There are no removable parts on the MAF sensor. I assume it's MAF sensor since I was following the clean up step here: https://5series.net/forums/diy-do-yo...diy-n52-98032/

@E60I - yes, my MAF sensor doesn't look like US version MAF sensor... weird...Did you have this issue after you replaced your starter? Did you manage to find out what's the cause?

Cheers

twh

tis66, I wasn't clear. The part you pulled out is NOT a MAF. It is *only* a temperature sensor. That's why it looks different -- it is different. That temperature sensor is able to be purchased for about 25USD. Just buy one and see if it fixes your problem. What I was trying to say was the by looking at the parts diagrams in that web site I mentioned, it seems that BMW sometimes uses a MAF sensor and sometimes uses only a temperature sensor. Now, I don't know what their criteria for choosing one over the other is.