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Location: St. Petersburg, Florida
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Missing at 4-5k rpm under load only.
Am I looking at an afm thing?
The 'sweet spot' has a hole in it. In especially second and third gear, with the pedal depressed OVER half way, I get dead spot in acceleration. (complete dead spots like nothing) Doesn't happen with the clutch in.  
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83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
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06-14-2004, 05:27 PM
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Speed and ref. sensor connections (mine are questionable)??
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83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
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06-14-2004, 06:43 PM
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Ok, nother hint...
Doesnt really happen in 1st that I notice. Usually right around 4100rpms.
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83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
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06-15-2004, 06:58 AM
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Check that afm. A guy on the "other" forum had that problem and it was solved by a new AFM...I say see if you can borrow an AFM to check your car with.
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-2002.5 GTI VR6 24V 6SPD -Kalahari Beige 89 Porsche 944S2 -87 VW GTI 1.8 16v -2007 Ford PIMP(free)star ...company car.... -1999.5 Jetta VR6 |
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06-15-2004, 07:33 AM
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Sometimes a flat spot is a vacuum leak where the intake bolts to the head. Also check the o-ring between the throttle body and the intake manifold.
Here's another potential; the tach. Gordons was bad and would disrupt the coil signal at certain rpms. His problem also impacted his smog testing showing the car running rich. Sticking flap in the AFS would also be a problem.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-15-2004, 08:05 AM
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Hey.....I think you are on to something..
loose bolts from intake to head. I just had a engine noise increase as well (normal rev noise). I did my head work a year ago and had several loose cam cover bolts a few months ago. Torque to bolts I will........ --kinda leaning against afm since it is only in certain gears and under load....wouldn't it do it in neutral as well? --oring 1 year old
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06-15-2004, 08:58 AM
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What about the ignition wires? My roomate had a similar problem and that fixed it.
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06-15-2004, 09:02 AM
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The "under load" is much different than "in neutral".
This is why the smog tests use a dyno.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-15-2004, 09:59 AM
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So AFM could still be a factor?
Or maybe the good ole flap?
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06-15-2004, 10:45 AM
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Could be that the harmonic resonance of the pulsing air flow through your specific intake is causing a standing wave at those exact rpms that interferes with the ballistics of the AFS flap.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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06-15-2004, 02:25 PM
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I can buy that.
First torque the bolts I shall.... Next Check the AFM I will...
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83 944 white w/Boxster wheels Planned mods- custom leather interior, 968 antenna, soundsystem, 968 style rockers, clear sidemarkers
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06-15-2004, 02:58 PM
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1983 Porsche 944 2.5 liter
