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Old 04-11-2013, 06:53 PM   #1 (permalink)
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Default Your RPM while in Drive, foot on brake?

Just wondering what your RPM's are while in Drive with your foot on the brakes. I ask this because I've noticed that the RPM while stopped at a light seems to be lower than when my gear is at Park. When the RPM is lower, the car seems to vibrate a bit. The vibration isn't all that strong at all by any means, but it's definitely noticeable.

So I tried some trial and error in my driveway. I put my car into Drive, then put on my Emergency Brakes. The moment I took my foot off the brakes, the RPM went up slightly and the vibration completely went away. Then I pressed the brakes and voila! The RPM dropped and the vibration came back. Also, putting the windows up and down seem to affect it too.

Please tell me this is normal... I hate going to the dealership for anything but warranty related maintenance and this is my first new car.
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Old 04-11-2013, 07:57 PM   #2 (permalink)
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One possibility:

Any kind of action that results in using electrical power like brake lights or power windows results in some power draw on the alternator thus causing a slight drop in RPM's.

I think what you are describing is completely normal.
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Old 04-11-2013, 08:06 PM   #3 (permalink)
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Quote:
Originally Posted by FloridaGator View Post
I think what you are describing is completely normal.
I think Gator nailed it.....but your battery could be weak too.

While it's possible, I doubt that simply activating the brake lights should make a significant change in the engine load.

Since it probably is still under warranty, I think you should demonstrate the behavior to the dealers service department when it is convenient for you to do that and see what they say.
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Old 04-11-2013, 08:15 PM   #4 (permalink)
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Originally Posted by Easy Rider View Post
I think Gator nailed it.....but your battery could be weak too.

While it's possible, I doubt that simply activating the brake lights should make a significant change in the engine load.

Since it probably is still under warranty, I think you should demonstrate the behavior to the dealers service department when it is convenient for you to do that and see what they say.
Hmmm... Weak battery huh? I guess I'll make an appointment sometime next week, though I'm not sure if the dealer would even bother to look into it thoroughly.

Anyways, if it does turn out to be completely normal, it still bothers me a little that the car vibrates. My friends have 4 bangers too, though they're different brands, but their car's never seem to rattle or vibrate while stopped at a light.
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Old 04-11-2013, 08:18 PM   #5 (permalink)
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I think it may be due more to it being in gear with the torque converter in action.

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Old 04-11-2013, 09:05 PM   #6 (permalink)
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We have an old multi page discussion about the rough idle issue. There were some good theories near the end of this discussion. If you are on pc then the search box is your friend.

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Old 04-11-2013, 10:16 PM   #7 (permalink)
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Yes, lots of discussion about rough idle. Search for "rough idle." There is a recall because of the brake pedal switch and tail lights, cruise control. They will be replacing switches.
Your description of poor idle in D with the foot brake on exactly describes my car. Emergency brake on and take your foot off the brake pedal and all is good.
I am hoping there is an electrical problem with the brake switch and some stray current is leaking into the computer and telling it to idle slower. I hope with the change of the switch, it may cure the problem. We all got our fingers crossed. A lot of us have problems and no cures or fixes from Hyundai. Maybe the recall will help.
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Old 04-11-2013, 11:03 PM   #8 (permalink)
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First guy with this problem that gets the brake light switch changed out, report back if this helped rectify the issue with the idle.
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Old 04-12-2013, 12:24 AM   #9 (permalink)
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I have the same thing happening with my car, I'm going in for service next week
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Old 04-12-2013, 01:41 AM   #10 (permalink)
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Quote:
Originally Posted by Mister K View Post
So I tried some trial and error in my driveway. I put my car into Drive, then put on my Emergency Brakes. The moment I took my foot off the brakes, the RPM went up slightly and the vibration completely went away. Then I pressed the brakes and voila! The RPM dropped and the vibration came back. Also, putting the windows up and down seem to affect it too.
If you were able to duplicate the rough idle on demand as you have said, that is fantastic. I think you will be one of the first to be able to create the rough idle. The service guys can't investigate something they can't see. I think when most have taken their cars in the rough idle never happens.
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