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WTB 3sgte AFM sensor [Archive] - Toyota MR2 Message Board

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WTB 3sgte AFM sensor [Archive] - Toyota MR2 Message Board Toyota MR2 Message Board > The Toyota MR2 Marketplace > MR2 Parts Department > MK 2 Parts Wanted > WTB 3sgte AFM sensor PDA

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serjey1508-07-2011, 11:31 AMHello, I am looking to buy a afm from a 91-95 mr2 turbo. I would like it to be checked with a multimeter to make sure its in good working condition. Let me know if you have one. Thanks. eckoman_pdx08-07-2011, 12:51 PMHello, I am looking to buy a afm from a 91-95 mr2 turbo. I would like it to be checked with a multimeter to make sure its in good working condition. Let me know if you have one. Thanks.

Whoever has a an AFM, it's very easy to check to make sure it's in spec. It take less than 5 minutes with a multimeter. Out of spec is out of spec in this case. Also, I've seen a few which were close to the low end of the range on VC-E2 which ran lean, so too close to the 200 ohm mark can mean it's letting go.

Other than that's, it's a straightforward check. It's always good to check too. The first AFM I tried ended running just pig rich on the car. I tested it and t was way out of spec on VC-E2 (way over the high end of the range). The next one was tested (took like two minutes), it was good so I was good to go.

The file is pretty straightforward, so if you've never checked one before it's pretty easy. Good luck finding one! Xuracing08-08-2011, 02:36 PMi have one. pretty sure its in spec. still on my car working. Let me know if you are interested serjey1508-12-2011, 11:34 AMI am interested, Can you check the specs on it with a multimeter? serjey1508-12-2011, 08:58 PMBUMP. I really need an AFM guys. Let me know if you have one. Black93Hardtop08-13-2011, 02:05 PMHow about a HKS VPC (vein pressure converter) to eliminate that pesky AFM? I have both 440cc and 550cc chips depending on your injector size..

Thanks,
Brian eckoman_pdx08-13-2011, 04:41 PMOkay guys, it's REALLY not hard to check the specs with a multimeter. You just unplug the connector (which needs to be done if your shipping it anyways), put the multimeter setting to test ohm load, and then touch the + & - leads to the respective pins on the AFM to make sure the reads are in spec (I even provided the relevant BGB pages for specs).

I've seen AFM's which are out of spec but not throwing a code, which is why it's important to test it with a multimeter first. It takes less than 5 minutes, start to finish. Someone has to have an AFM and a multimeter and be willing to take an extra 5 minutes to ensure they aren't selling junk (an out of spec AFM = junk) serjey1508-13-2011, 04:52 PMHow about a HKS VPC (vein pressure converter) to eliminate that pesky AFM? I have both 440cc and 550cc chips depending on your injector size..

Thanks,
Brian

I have stock injectors, how does this system work? Will it make my Gas mileage go back to normal? Because I am at 15-16mpg with a bad afm and o2 sensor. Thanks Black93Hardtop08-13-2011, 06:56 PMI can supply it chipped for stock 440cc injectors, thats no problem. Fix that o2 and with a proper install your gas milage should go back up to normal.

It converts maf systems to speed density. It is a pretty cool and fairly simple system that free's up intake restrictions by removing the AFM and adds reliability by again.. removing the AFM. I also have a chip for 550cc injectors if you ever decided to up your fuel system for more power (bigger turbo, ect..)

Not a bad idea honestly. I simply dont need it as everything I have is Gen3 around here (no AFM from factory).

Thanks,
Brian Heytheremr208-13-2011, 07:41 PMI can supply it chipped for stock 440cc injectors, thats no problem. Fix that o2 and with a proper install your gas milage should go back up to normal.

It converts maf systems to speed density. It is a pretty cool and fairly simple system that free's up intake restrictions by removing the AFM and adds reliability by again.. removing the AFM. I also have a chip for 550cc injectors if you ever decided to up your fuel system for more power (bigger turbo, ect..)

Not a bad idea honestly. I simply dont need it as everything I have is Gen3 around here (no AFM from factory).

Thanks,
Brian

how much and what needs to be done to install it? Black93Hardtop08-13-2011, 08:27 PM$250 and they are not hard to install. You can find the diagrams online. The harness I have is not from an mr2 but they are easy to just install in anything. simple concept. here is a quick installation I found.

MKIV.COM (http://www.mkiv.com/techarticles/vpc/vpc.htm)

If your not interested in that I do also have a AFM that passes with a multimeter. It is very nice and I would like $180 shipped for it.

Thanks,
Brian LeePeyton08-16-2011, 03:11 AMIf you are some kind of VPC guru I have questions because mine has been a nightmare. Black93Hardtop08-16-2011, 08:50 AMShoot me a PM, I'll see what I can do. serjey1508-19-2011, 12:57 PMBUMP Black93Hardtop08-19-2011, 09:14 PMI did mention I have one that passes the multimeter test as well... serjey1508-20-2011, 01:10 AMWhat are the results? And how much $? Heytheremr208-20-2011, 10:11 AMserj, did you ever even test yours? every time i offer you never swing by serjey1508-20-2011, 11:12 AMim sorry bro Iv been hella busy. I will need to test it before I order a new one, but James Insists mine is bad since I pulled it out, I would rather it just be my o2 sensor hahah Heytheremr208-20-2011, 12:53 PMbest to check to make sure. hell mine was in great condition. maybe ill just swing by your work sometime and do it out in the parking lot and just give you the results haha serjey1508-20-2011, 04:19 PMWell then its your o2 sensor thats giving you SUCH bad gas mileage? 10mpg less than normal? Heytheremr208-20-2011, 04:36 PMits like 5 less. city mileage is horrible, highway is...better. i think i also have seized calipers, which would also bring down my mpg. (more resistance the engine has to overcome, the more gas you use) but im sure you knew that. and yeah, i checked my o2 sensor, and it was way out of spec. but my afm was perfect. eckoman_pdx08-20-2011, 09:12 PMbest to check to make sure. hell mine was in great condition. maybe ill just swing by your work sometime and do it out in the parking lot and just give you the results haha


im sorry bro Iv been hella busy. I will need to test it before I order a new one, but James Insists mine is bad since I pulled it out, I would rather it just be my o2 sensor hahah

He's throwing an AFM code (I believe two). It's the code which states the signal from the AFM is not correct. He removed the screws, and pulled it out. He saw a little of the intenral start to come out. At that point, the AFM is gone, since the internal connections are messed up. That's pretty common knowledge. Best bet is to buy a new one unless you are really good at soldering. If you are REALLY good at soldering, you might try to crack it open and see if you can fix it. You'd remove the seal at the top and pry the cover off. You'll have to reseal it when done. If you screw this up though, the car is parked until you buy a new AFM.

Anytime you remove the screws and pull the connector out, you ruin the internals of the AFM. It's pretty well known at that point it's done. At that point, a test is pointless...especially considering it's through the codes for messed up signals which are expected after you do that. Honestly, I don't know why people aren't wanting to test it. It's not hard.


I did mention I have one that passes the multimeter test as well...

Black93Hardtop, can you post up the numbers you got for the 3 connections to test with a multimeter, and what ambient air temp was at? serjey1508-20-2011, 10:44 PMYeah, I will most likely buy a new AFM. You think the bad AFM affects my performance? Heytheremr208-20-2011, 11:27 PMWELL he didnt mention that part haha. i just thought he was assuming it was bad eckoman_pdx08-22-2011, 04:21 PMWELL he didnt mention that part haha. i just thought he was assuming it was bad

Hahaha, yeah. That's an important detail to leave out, lol.


Yeah, I will most likely buy a new AFM. You think the bad AFM affects my performance?

Heck yes it will affect your performance. You're ECU can't read the air flow signal correctly, and that's what determines the fuel mapping and a whole slew of things. If you ECU can't properly read the AFM signal, it's doesn't know what's actually going on, so it can't properly run the car. With a messed up AFM, nothing is going to run correctly at all, and your performance will drop. Powered by vBulletin® Version 4.2.5 Copyright © 2026 vBulletin Solutions Inc. All rights reserved.

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