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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 09-10-2012, 08:31 PM   #1
a32axo
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car start without fan? Help!!!

Im looking for a coolant leak, I think thermostat screw wasnt tighten all the way, can i start car without fan and airbox and maf?

Last edited by a32axo; 09-10-2012 at 08:32 PM.
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Old 09-10-2012, 09:09 PM   #2
a32axo
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any help

anybody have an answer?
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Old 09-10-2012, 09:28 PM   #3
REKLESS ROB
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Leave the MAF connected, you can run the car without the fan and air box. You should really just use a cooling system pressure tester. Good luck.
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Old 09-10-2012, 10:12 PM   #4
joegr
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Originally Posted by REKLESS ROB View Post
Leave the MAF connected, you can run the car without the fan and air box. You should really just use a cooling system pressure tester. Good luck.
If the air box isn't there, then it's better to unplug the MAF. That way, the PCM will know that it can't meter the air and will use defaults. If you plug in the MAF, but don't pass the intake air through it, the PCM will think the engine is getting very little air, so it will inject very little fuel, I assume.
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Old 09-10-2012, 10:17 PM   #5
a32axo
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ok

Thank you guys, started the car and found the leak. Its coming from the thermostat electrical hole.
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Old 09-10-2012, 10:21 PM   #6
BMWCaptain
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Yes, you can start the car without the mechanical fan, the airbox and the MAF. You could also leave the MAF on and it will meter the air. It doesn't know what is attached to it, it only measures the amount of air that passes thru it.
Joegr, your assumption is incorrect. The air will actually flow easier without the airbox. The ecm doesn't make any assumptions about the airbox, it is just using the MAF to calculate the volume of air.
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Old 09-10-2012, 11:27 PM   #7
joegr
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Originally Posted by BMWCaptain View Post
Yes, you can start the car without the mechanical fan, the airbox and the MAF. You could also leave the MAF on and it will meter the air. It doesn't know what is attached to it, it only measures the amount of air that passes thru it.
Joegr, your assumption is incorrect. The air will actually flow easier without the airbox. The ecm doesn't make any assumptions about the airbox, it is just using the MAF to calculate the volume of air.
Sorry, I'm used to the MAF being on the airbox of my other three cars. I forgot it stayed with the throttle body side of the intake on the BMW. On my other cars, with the airbox off, the MAF would be sitting to the side somewhere not metering any airflow into the engine.
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