Decelerates on acceleration! Help!

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  1. Decelerates on acceleration! Help! 
    #1
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    Dave245's Car Details
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    Evening all.

    Z3 (1990) owner looking for some advice from some of you more experienced guys.

    As suggested in the title, when I put my foot down to accelerate, the car pulls back completely and begins to decelerate. The only way I can describe this is as if it was building up the power, then it finally shoots off.

    Not sure where to begin with this. Car revs fine and the actual accelerator is responsive. Going to whip out the spark plugs tomorrow and check them out.

    Anyone got any ideas how to fix this/improve the acceleration? Seen on other places people have said to look at fuel system, but is there anyway to diagnose before I start messing around with everything - only a novice and it will take me time I don't have the luxury of!

    Cheers
     
     

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    rhyd330i's Car Details
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    Hi Dave

    Sounds like you're describing 'bogging down', so it'll be either an air intake problem or fuel (weak pump or clogged fuel filter)

    Is the EML or Check Light on the dash?
     
     

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    It might be a tear in the intake hose.
    What car is it?
     
     

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    Dave245's Car Details
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    Well that's another story about the check lights Rhyd!

    I'm 90% sure some of the dash lights are faulty. I've had the whole instrument console out to check the bulbs etc and they all look fine - The EML or check lights don't actually show on starting the car either.

    The car is a 1999 1.8 Z3. Only had it 6 months the woman before had it serviced regularly, but I guess on an old car like this there are bound to be issues.

    Where would a novice begin investigating something like an air intake/fuel pump clog? Would be nice to get it back to how it might've been once upon a time
     
     

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    Very easy, open the bonnet and you'll see a large rubber intake hose with a corrugated section to allow the engine to move about a little.
    Have a look at that hose for tears or rips, or any other hose that has a split in it.
     
     

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    So I had a look at what I pressumed was the intake hose (looks connected to the fan) and couldn't see/feel any tears. Checked the others and couldn't see anything

    Maybe this is a lost cause and just a symptom of an old car, what do you guys think?
     
     

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    BMW engines tend to outlive the chassis in most cases, so it might be a sensor or something.
    If there's nothing obvious, try a diagnostic and see if the car has recorded anything.
     
     

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    Awesome, thanks for all the advice all.

    I know a guy who will diagnose for free so will have to see what he says!

    cheers
     
     

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