Question about 2001 Hyundai Elantra

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Engine RPMs go down slowly when clutching/shifting manual tranmission -- . Seems to take several seconds to go down to the 1000-1500 range which is much longer than it seems like it should take and longer than in the past. The engine runs smoothly overall. Any ideas??

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  • Kelvin Hawkins Apr 25, 2010

    Thanks for the tip. Are the vacuum lines typically difficult to change out? If you were to guess, which one do you think is causing the problems?

  • Kelvin Hawkins Apr 25, 2010

    Thanks for the tips. I am going to follow the suggestions. Thanks

  • Kelvin Hawkins Apr 27, 2010

    I checked the vacuum hoses. All seem to be ok, but replaced one that I thought might be going bad, but still having the same rpm problem. I read some comments for other people's issues. Any chance it could be the Idle Speed Control unit or the Throttle Position Sensor? If so which one would you suspect? Or any other ideas. No engine lights are on. Like you mentioned previously I may need to take to shop, but just checking further before I spend the money. Thanks again for your help.



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Your engine has an air leak in the vacum system. It could be a loose vacum hose or a the engine is sucking air through your intake manifold.

It can be found easily with a gas detector/leak tester if you have one.
If not then you will need to take your car to a good workshop to have them check it out for you.

If you need further information just ask.



Posted on Apr 25, 2010

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  • Jason Maurirere
    Jason Maurirere Apr 25, 2010

    No. They are the small black hose's running into the inlet manifold part of the engine, one may be loose or come off, just check all the small black hose's are tight on their fittings. If they look worn and broken on the ends then just cut that peice off and rejoin it to the fitting.

    But if it still happens after you've done this then it could be the intake manifold, which the gasket will need replacing.

    Also check the big hose going to your brake booster where your brake fluid goes?

    This hose maybe loose.

  • Jason Maurirere
    Jason Maurirere Apr 25, 2010

    They are push on so quite easy to pull of and put back on.

  • Jason Maurirere
    Jason Maurirere Apr 27, 2010

    Just check without engine running that the throttle it returning fst enough when you open it up and release it.

    Do it by hand on the throttle body.

    The idle speed control can effect it but it would usually keep reving and not return back to idle which is usually 900 - 950 rpm.

    A throttle positon sensor can have a small effect if it is worn where the thottle shaft goes into it.

    It depends if yours is a switch type or potentiometer type.

    If you know how to test it then you can check to make sure that this is returning back to position as soon as the throttle has shut from been open.

    You need a multimeter, and check the 2 pin on the inside of the plug for the voltage difference.

    If you can do this let me know and I will take you through it.



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  • EditTips for preventing transmission damages

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    • Avoid "riding the clutch", i.e. needlessly keeping your foot on the clutch pedal.
    • Never use clutch slipping for regulating the speed of a heavy truck!
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