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Posted on Aug 10, 2008
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While driving at speed on the highway on a flat not accecerating or deaccelerating my car drops roughtly 500 rpms for about 2 seconds then picks back up

  • Anonymous Mar 21, 2014

    new batt , new belts how ever i did test alt it passed but i still get a drop in voltage then it will pick back up ? is it possible the alt is working half the time?

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  • Master 1,665 Answers
  • Posted on Aug 11, 2008
Anonymous
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Joined: Dec 23, 2007
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Check for any loose wire harness connection, spark cables, and fuel pump electric power relay and fuse holder case.

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1999 mitsubishi montero sport. Randomly started hesitations and low rpms in gear at idle. and highway speeds dropped rpms slightly and when let off accelerater rpms drop too quick and low. Any ideas?

Engine light on? Many things can cause this. Mass airflow sensor, throttle pos. sensor, cam sensor, idle control valve, O2 sensor, vacuum leak etc, diagnosis be great. Good luck
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Mitsubishi triton mn

it may require a ECM upgrade in the software
in the mean time restrict the rpms between gear changes
for example accelerate in first ti around 3000 rpms and slow down the selection and keep the rest of the changes around the 2500-3000 rpm range
naturally , the harder yo rev it the longer it will take for the rpms to drop
just as a point of interest how did you get a brand new car that is 4 years old ?
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High rpms, low speed

sounds like 2 problems one the transmission throwin u forward and high rps then cloged converts slow to speed and wont go pass 80 kilometers

If you need further help, reach me via phone at https://www.6ya.com/expert/james_9c1b039055413ffa

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Problem with electronic throttle control maybe. Any light's lit on the instrument cluster or messages engine power reduced . Could be a sign a position sensor is going bad . The gas pedal assembly has to sensors as does the throttle body . You could try cleaning the throttle body bore . Having a qualified repair shop hook up a diagnostic scan tool to view sensor data would be a good thing .
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Sounds like you are experiencing problems with your transmission or your tcm (trans control module) located next to your computer.Is there any mil on? That will help also.
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