Rpm stands for revolutions per minute. This is talking about the revolutions the crankshaft goes per minute. The faster you go to more revoultions that are accomplished. Therefore the faster you go, the rpm goes up. And as you slow down it goes down.
do you mean warmed up ,at idle, the rpm surges up and down with out foot on gas ?
what is wrong with my rpm it goes up and down
coul be the map sensor
Most likely going down hill, the faster the wheels go, the higher the RPM will increase, for this to increase the vehicle either must be going downhill with no brakes applied or the throttle(acceleration) has been depressed.
2004 dodge grand caravan 4.0sxt cuts up when apply brake in gear and rpm go up and down.
When you are shifting gears, your RPMs will go down because your clutch is being pressed. If your RPMs don't go back up when you release your clutch, you should see a mechanic.
if it drives normal except when you let off the gas the rpm jumps then it is a map sensor
Idle Air Control Valve....if this breaks you car wont idle properly....the rpm will go up then down all the time when idling
09 chevy impala rpm jumps up and down
Engine sag, stumble, hesitation, rpm flare, transmission shifts up and down, etc.Engine sag, stumble, hesitation, rpm flare, transmission shifts up and down, etc.
You can also relate this to the car crank shaft speed , and it is measured in Revolutions Per minute =RPM's. faster your crank shaft rotates (RPM's), the faster your pistons travel up and down the cylinders, thus the faster your car will go. Hope this was what you were looking for...
It is normal for a GMC Sierra to idle fast when it is first started. It will idle at around 1500 rpm until the engine warms up. To get it to slow the rpm's sooner, a person can tap the throttle once and it should slow down.