1991 Acura Legend idles up and down when in park

lilpill · All-Acura Enthusiast Joined: Apr 07, 2004 Posts: 11

I have a problem I'm hoping someone knows the answer or is going through the same problem. When my car is in park it goes up and down kinda like if you had your foot on the gas pedal and you were pushing it down then lifting it up then pressing down. The rpms going up and down and this is while it's in park. I don't understand why it is doing this. Can anyone answer this for me?

AcuraImport · Site Admin Joined: Mar 11, 2003 Posts: 287

Is the check engine light on?
_________________
If you feel like you're in control, you're not going fast enough. ~ Mario Andretti

lilpill · All-Acura Enthusiast Joined: Apr 07, 2004 Posts: 11

ya it's on and stays on.

AcuraImport · Site Admin Joined: Mar 11, 2003 Posts: 287

Take it to autozone, they can run a engine diagnostic for you (tell you what is wrong). I had a similiar problem with my MAP sensor, and a vacuum leak.
_________________
If you feel like you're in control, you're not going fast enough. ~ Mario Andretti

lilpill · All-Acura Enthusiast Joined: Apr 07, 2004 Posts: 11

Thanks! you've been a big help. I will take it to AutoZone.

DrFunk · Newbie Joined: May 17, 2004 Posts: 1

It may be air in your radiator, or your speed sensor is gone bad those are the two that I know of

livicicereighner · Newbie Joined: May 31, 2004 Posts: 1

I fixed it by replacing the coolant temperature sensor, located on top on the engine slightly to the front left from the center. However this was not the final peace, what fixed it was filling up my stupid radiator fluid. I'm not sure how it got so low, and the engine never overheated, but without enough fluid the sensor was sending faulty signals to the MAP sensor. Once the MAP sensor received the bad signal it went to a fail safe idle setting.