MAF testing?

[Antihero983]

alright i've been searching on here for about an hour now, and have found little to nothing on HOW to test a MAF. I have a stock KA24DE in an s13.

anyone have any info on how to test the maf and what o test it for?

[racepar1]

It is pretty damn difficult to test a MAF sensor. Some are pretty much un-testable. I'll check mitchell and see if there is a way to test the s-13 MAF sensor or if it is a process of elimination. MAF sensors rarely go bad though, especially on 240's.

[Antihero983]

well, mine is doing the whole running good when the maf is unplugged bit, and there are NO and i mean NO vacuum leaks on this car.

[blownmotor]

Try to test voltage test on the car when idling should be somewhere between 700mv to 1100mv on the signal wire You need a DVOM to do it

[s14jesse]

turn the car on and unplug the maf and if it idels good that means ur maf is bad

[timlush]

Originally Posted by s14jesse

turn the car on and unplug the maf and if it idels good that means ur maf is bad

That is not true at all.

Unplugging the MAFS basically puts the car in a 'limp' mode. Thus masking other problems. It could be something like the coolant temp sensor. Hell, I had the completely wrong ECU on my car, but when I unplugged the MAFS, it idled GREAT.

[stinky_180]

pages in fsm

EF & EC 96

[sillyvia13]

put your maf on my car.
start car. and find out what happens.
you got my numba!?
always welcome.
Peace Russ\

[sillyvia13]

got your rep.
thanks Joe.

I will adhere to you advice.
Stay up.
Russ.
Have a good one.

[Antihero983]

:edit:

taken to pms.

bomber, thanks for the offer, i'll hit you up asap when i find out more.

[rps13drift]

You need to get a voltmeter!

With the key in the on position Check the black/white stripe wire for 12 volts.

Then check the white(signal)wire for around 0.5/0.6 volts and heres the good part! Blow into the maf with the voltmeter still hooked up and your voltage should rise as you blow into it!

And then last check for a good ground on the black wire.

I hope this helps and this is the best way to see if your maf is realy working without doing the whole plug it in plug it out/borrow your friends maf guess work. You can also check your ecu for codes!
Good luck!!!
-mike-

[Jonnyblaze]

so if my car idles like shit with the maf plugged in and idles decently unplugged its not necessarily my maf?

[Phlip]

Swap MAF with a friend, if the problem follows the MAF, replace it... If not, keep searching for possible cause

[Antihero983]

Ive tried 3 mafs, one of which came out of a runnng car. I'm just trying to double and triple check my shiznat.

[stinky_180]

did you follow the diagnostic procedure in the pages i said?

[DALAZ_68]

if ur gonna check voltae of th emaf and dont wana damage hewires just do what i did and puncture a small hole in the wire with a tack or push pin