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Thread: Bad AFM electronics or something else?

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    Default Bad AFM electronics or something else?

    So I was sitting at a stop light, when the light turned green and I went to accelerate and the car instantly died and the check engine light came on. Tried to start the car again and it fired up, but then died again when I touched the gas. Ended up pushing the car off the road. Popped the hood to look around and I couldn't see anything wrong. I kept trying to start the car but it would only fire once or twice then die. Finally, I got the car to stay running and limped the car back home. I had to touch the gas very gently and drive slow. If I pushed on the gas to accelerate normally the car's RPM's would immediately drop and the car lost all power and would die unless I let off the gas fast.

    I checked codes and I got code 31 and 34. I'm guessing code 34 is from hitting fuel cut a few times, but 31 is for an AFM problem. The car will idle fine now, but if I try to rev it while parked the RPM's seem to only go to about 2k then drop then bounce back up and so forth while I'm holding the gas. Seems like every once in a while when I was revving it it would go above 2k, but not very often. I unplugged the AFM while the car was idling so see if it would have any affect on the car, and the car wasn't affected at all by me unplugging the AFM. I then went to rev it up while it was still unplugged and the car was running the exact same. So would this mean my AFM electronics are bad and not doing anything for the car? I looked over the Connection and couldn't visibly see anything wrong with the wires or plug.

    1987 Turbo Supra - built 7m- 471 RWHP - (Sold)
    1990 1JZ swapped Supra - Big single, EMS - Power unknown -(Sold)
    1990 Turbo Supra - Mostly stock for now, and very clean!

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    Default Re: Bad AFM electronics or something else?

    AFM condition aside (it should be actively measured) the engine should rev to 3K with the AFM unplugged. That it does not indicates multiple problems. No surprise there.

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    Default Re: Bad AFM electronics or something else?

    I forgot to add, I also checked for any loose intercooler pipes or rips for a boost leak but found nothing wrong with the IC piping.

    1987 Turbo Supra - built 7m- 471 RWHP - (Sold)
    1990 1JZ swapped Supra - Big single, EMS - Power unknown -(Sold)
    1990 Turbo Supra - Mostly stock for now, and very clean!

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    Default Re: Bad AFM electronics or something else?

    Well to make you happy I test the AFM with a Ohmmeter following this link:

    http://www.supracentral.com/foundati...821/FI_096.gif

    I had the AFM at 68 degrees so it should have read between 2,000-3,000 on the Ohmmeter. However, every time I tested it I would get a reading between 975 and 1921 So I'm going to say my AFM is shot.

    1987 Turbo Supra - built 7m- 471 RWHP - (Sold)
    1990 1JZ swapped Supra - Big single, EMS - Power unknown -(Sold)
    1990 Turbo Supra - Mostly stock for now, and very clean!

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    Default Re: Bad AFM electronics or something else?

    Not gonna make me happy. Not even close. I said actively. And I meant measure the AFM. You might want to stop anal-izing everything and actually learn how the car works...

  6. #6
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    Default Re: Bad AFM electronics or something else?

    Im trying to, but your posts aren't helping me learn or figure out exactly what to do. You keep telling me everything I do is wrong but you don't help me to do the right things. What exactly do you mean measure the AFM? Can you be more specific, That can be taking in several different ways. If anyone else has any ideas please help. Thanks.

    1987 Turbo Supra - built 7m- 471 RWHP - (Sold)
    1990 1JZ swapped Supra - Big single, EMS - Power unknown -(Sold)
    1990 Turbo Supra - Mostly stock for now, and very clean!

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    Default Re: Bad AFM electronics or something else?

    Measure the AFM means exactly that. Why would a bad trim signal cause the symptoms you're seeing? Have you read the TSRM? Do you even understand EFI basics? It appears you do not.
    In memory of Rimma Kiselitsa

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    Default Re: Bad AFM electronics or something else?

    Once again not a helpful post. I assumed it meant measuring the Ohm's as it says to do in the TSRM, I don't know how else to measure the electronics. I did read the TSRM it says replace the AFM electronics if the Ohm's are not within proper range. This would be why I assumed it would cause my problems because I threw a code 31 which says the test the AFM, which I did. So one would assume that means the AFM is bad. At least I did. If you don't think the AFM is my problem can you atleast help me figure out what else could cause this problem??? I made this thread to get help, not to get ripped on about my ignorance. Clearly there are things I don't know or can't figure out, other wise I would not have made this thread.

    1987 Turbo Supra - built 7m- 471 RWHP - (Sold)
    1990 1JZ swapped Supra - Big single, EMS - Power unknown -(Sold)
    1990 Turbo Supra - Mostly stock for now, and very clean!

  9. #9
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    Default Re: Bad AFM electronics or something else?

    I believe that I understand efi quite well and I am unsure what you are getting at. How can you measure the afm without a scope since it uses a frequency signal?

    OP: all the ohm's tell you is whether or not the temp sensor in the AFM is working properly otherwise you would need a scope to measure the response.

    Or I could be wrong but I ain't proud.

    Jetjock: I am confused by your overtly aggressive response. If a code 31 is popping up apparently there is something wrong with either the AFM or ECU. How else would you approach the problem?

  10. #10
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    Default Re: Bad AFM electronics or something else?

    Quote Originally Posted by MightyAl View Post
    Jetjock: I am confused by your overtly aggressive response. If a code 31 is popping up apparently there is something wrong with either the AFM or ECU. How else would you approach the problem?
    They have a weird Father son type of relationship Lol..





    On the other note SupraFanatic AFM seem to be everywhere these days i would swap yours out and see if it fixes the problem if not then look elsewhere Can't be more simple then that.

    And don't feel so bad because i don't understand everything some of the Seniority guys tell me either but only one way to learn my friend.
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