What does it mean when you car is going 50 and the rpm goes up and down when the car is idleing

10

Asked by May 13, 2014 at 09:47 AM

Question type: Maintenance & Repair

2000 2.2l cavalier

5 Answers

105,395

So when the car is stationary and idling the speedo is reading 50 MPH and the Idle RPM's are not stable. Is that the way it is?

3,845

Your cars transmission has several shift points. As you are approaching a shift point your RPM's will drop and you shift into the next gear. You could be "at 50 mph" on the cusp of a shift point and it may shift down which will make your RPM's go up and when it shifts up the RPM's will go down.

2 of 2 people found this helpful.
10

When the car reads 50 mph and you let go of the gas all together the rpm will go up and down tell I slow down or touch the gas. What is rong

1 of 1 people found this helpful.
3,845

again... when you let off the gas the car may shift down. your cars computer will bring up the rpm's regardless of touching the gas so that it will not damage the tranny or engine

1 of 1 people found this helpful.
105,395

Have the codes pulled something may be out of specs and have set a code.

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