Jumping car

chevrolet
beretta

#1

when I let off the gas, sometimes (almost always) the car starts to jump. If I press the gas or the brakes, it stops jumping. What is the cause of this? This is on a 94 Beretta with a 2.2L manual tranny


#2

When was the last time the front suspension was inspected? Because from what you describe it may be a lower ball joint that’s ready to fail. And if that happens, you’re in for the ride of your life!

Have the front suspension inspected. I had a 1995 Beretta.

Tester


#3

I don’t know when the last time was. If I can keep an even speed it runs just fine. Is it possible to replace the ball joint without taking it to a shop?


#4

You first have to know how to inspect the front suspension before learning how to replace a ball joint. So no.

Tester


#5

what happens when the lower ball joint fails if Im on the road when it does go?


#6

The tire will fold either under the vehicle or outside the vehicle, and you’ll have no steering.

Tester


#7

Here’s an example of a lower ball joint failure. http://www.aa1car.com/library/wheel_missing.jpg

Tester


#8

" the car starts to jump. "

Perhaps you could elaborate a little more on that…I’ve never seen a car “jump”, except some Mexican creations with hydraulics in them…


#9

the car starts jerking forward (like when a person forgets to shift into neutral when they stop). When it starts jerking, I can either press the brake, gas, or do nothing and it will eventually stop jerking.


#10

I have never seen anything like that.


#11

Clean the MAF, check the operation of the EGR valve, check for a vacuum leak and the throttle position sensor…


#12

where would I find the EGR valve and the throttle position sensor?


#13

Time to by a service manual for your car…


#14

Lol. Thank you. Could it also be the lower ball joint as well? My original thought was that it had something to do with the throttle body itself.


#15

how can u tell if the throttle position sensor is bad