What resistance should the variable resister be in the air flow meter of a 316i m40, 1989 E30
Measuring resistance of air flow meter
Moderator: martauto
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spacechimp
- E30 Zone Newbie
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- Joined: Sat Sep 12, 2009 11:00 pm
- Location: Morcambe
Hi,
What resistance should the variable resister be in the air flow meter of a 316i m40, 1989 E30
What resistance should the variable resister be in the air flow meter of a 316i m40, 1989 E30
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Speedtouch
- Old Skooler
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///M aurice
ECU Upgrade EPROM Chips, £40 posted within the UK. Note these are not Zone chips.
viewtopic.php?f=6&t=279421
ECU Upgrade EPROM Chips, £40 posted within the UK. Note these are not Zone chips.
viewtopic.php?f=6&t=279421
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Brianmoooore
- E30 Zone Team Member
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- Joined: Mon Jan 10, 2005 11:00 pm
You cannot reliably test an AFM by making resistance measurements!
The correct way to test one is to connect a six or nine volt battery across the outer terminals of the potentiometer, and then monitor the voltage on the wiper while carefully opening the flap by hand, preferably with an analogue meter. There should be no sudden jumps in the meter needle, and most importantly, the voltage should not drop at any point.
The correct way to test one is to connect a six or nine volt battery across the outer terminals of the potentiometer, and then monitor the voltage on the wiper while carefully opening the flap by hand, preferably with an analogue meter. There should be no sudden jumps in the meter needle, and most importantly, the voltage should not drop at any point.
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soul4t
- E30 Zone Regular
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- Joined: Wed Feb 23, 2011 11:00 pm
- Location: Bristol
As Brian said, I performed the test on the AFM in the car with mine, with the top off the AFM. The ECU supplies 5v AFAIK, so it can be measured as Brian suggests! What problems are you experiencing with your car?