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Sluggish throttle response due to AMF sensor?

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MR2_260z
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2013/10/26 18:57:02 (permalink)
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Sluggish throttle response due to AMF sensor?

Hey guys, after having my MR2 off the road for a while due to a snapped handbrake cable, i realised (due to driving my gf's civic) that the throttle response in the car feel quite sluggish. from idle, if i put my foot on the accelerator (especially when done with spirit :D) it dips roughly 100 rpm for about half a second then climbs up somehwhat slower than what my girlfriends civic does. (which obviously makes it take forever to get in to its powerband...)
I'm wondering, could this be due to a dirty MAF sensor? and if so, how the bloody hell are you supposed to take it off!?!? i know that there are 2 screws either side of the thing, but there's so much crap in the way, there's no way i ca npossibly get a phillips head in...
Can anyone help?
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    just_ace
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    Re: Sluggish throttle response due to AMF sensor? 2013/10/27 01:03:17 (permalink)
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    Don't unscrew those that will ruin it. You have to remove the complete unit and use cleaner.

    Also possible someone screwed up installing the timing belt. As that can cuase sluggish take off etc.
    #2
    MR2_260z
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    Re: Sluggish throttle response due to AMF sensor? 2013/10/27 01:50:10 (permalink)
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    Ah, good to know! I guess i am being overly picky. This hesitation i talk about is not that huge at all, i guess I'd just like the ability to wind up the revvs a bir quicker considering where the MR2's power lies.
    Think of it as more of a dipping of revvs before it taking off. It is also very audible, it sounds as if there is almost too much air being sucked through, causing an air rich fuel ratio... i dunno...
    #3

    cogs
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    Re: Sluggish throttle response due to AMF sensor? 2013/10/27 11:45:57 (permalink)
    +1 (1)
    Looking at your previous posts it seems you have a 95 Bathurst, in which case it doesn't have a MAF sensor.  IIRC, no MR2's ever used a MAF sensor stock, Gen 2 turbos used an AFM, and everything else (including yours) is MAP based.
     
    There's plenty of things that could cause the problems you're having, from what I remember of driving an n/a the throttle response should be better.  You'd need to be more specific about the nature of this hesitation, it's the subtleties that give the most clues as to where to start looking, as well as any other drivability issues present.
     
    Probably best to have a good mechanic (or experienced DIYer) drive the car and give you some clues as to where to start looking, before you start randomly pulling things apart and possibly create more problems.

    1990 SW20 GT
    #4
    cogs
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    Re: Sluggish throttle response due to AMF sensor? 2013/10/27 11:59:46 (permalink)
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    I just read your thread about the sticking throttle, and it's possible you've created this issue yourself!  You adjusted the throttle stop to resolve the problem, but this is at best a band-aid solution and would have messed up the TPS calibration.
     
    The sticking throttle was most likely caused by carbon build up in the throttle body, in which case the correct solution is to remove and clean it out, then check that the throttle stop is correctly set and finally check the TPS calibration.  TPS calibration is done with a multimeter, the procedure is in the BGB.

    1990 SW20 GT
    #5
    MR2_260z
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    Re: Sluggish throttle response due to AMF sensor? 2013/10/27 13:23:15 (permalink)
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    Oh wow, good catch!
    You really did your background checks on me lol.
     
    Im not hugely familar with all these electronic mumbo jumbo parts, so I'm thinking perhaps
    i should take it to a electrical mechanic/ tuner...
     
    Better yet, i should probably come out to a meet and meet some of you guys!
    #6

    MR2_260z
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    Re: Sluggish throttle response due to AMF sensor? 2013/10/27 13:28:02 (permalink)
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    But i guess when i have the time, it seems as if i should probably take the throttle body off the car and give it all a good checking out.
    #7
    Reddtarga
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    Re: Sluggish throttle response due to AMF sensor? 2013/10/27 17:43:57 (permalink)
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    "Im not hugely familar with all these electronic mumbo jumbo parts"
     
    You can download a free Gen 3 engine workshop manual from the tech section of this forum, will tell you all you need to know.

    1990 ADM NA
     
     
     
     
     
     
    #8
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