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if there is a big black box that has about 10 wires going into the top of it on your intake plumbing... then it's AFM
 

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Country Hick
2001 Nissan Pulsar
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Let me show you graphically coz it is easire to explain:



This is an AE101 with a 20v, but it's similar... the white arrow shows you what an AFM looks like... and the yellow arrow shows you where the MAP will be, roughly... it is a little vacum sensor on the back firewall.
 

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afms are big blocky suckers that go in your airway.

that above is a blacktop (comes after the silver), and it came with a map, as seen in the silver top image, see the big blocky thing after the airbox? thats an AFM, i have a MAP, which isnt actualy seen here.. but you can tell, because there is no AFM!
 
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