try changing your TPS (throttle positioning sensor) its located on the intake area (look where the throttle cable hooks to the engine) Possibility of a fuel pressure regulator problem. Also a faulty Idle Air Control motor (IAC) could cause the problem. ask a local repair facility for assistance. I had that problem with my grand prix. Replaced everything I could think of. turned out to be that the computer needed to be reset. possibly a vacuum leak...check hoses, you may need to replace you intake maniflod gasket
idle airflow metre or pipe may have come off carb check both
A vacuum leak can cause that.
Check the Idle Air Control. It might have carbon deposits and need cleaning. Also do the same for the throttle body intake. It might also need cleaning.
A vacuum leak or a dirty or defective Idle Air Control Valve will cause an unstable idle. jd
vacuum leak, bad idle control sensor
intake gasket is leaking
I'm going to guess yo have the air on, that would mean that the idle compensator is out of adjustment and over revving the engine.
Sit in the car in neutral, rev the car to 2000 revs then apply the break firmly whilst still holding the car at 2000 revs. If the idle drops back down then the car is drive by wire... so ive been told anyway! :)
no, you should let it idle and warm up a little bit.
What car is it? what year? is it a diesel or petrol? could be you r base idle?? but need know more info..... does it stall in drive with foot on brake? does it rev high?my car is a 07 Chevrolet Colorado,standar
change the TPS sensor, (throttle position sensor).
It may be that the idle is set at max rpm on your carberator
More than likely it is your idle control sensor. It will idle, and then all of a sudden by itself rev up. If it continues to rev constantly your throtle cable may be broke, the spring, or possible the cable is catching on something
Your car is gearing down to first and to do that it has to rev a little
check your Idle sensor which is attached to your throttle body. This ussually goes bad and tends to rev the idle up. I had the same problem with my 99 wrangler.
check your idle air control unit also called an IAC motor
If the rpms are above normal the most likely problem is a vacuum leak at the intake side of the engine. This condition will also typically cause a rough running situation at idle. Another thing that could cause a car to rev up and shake is a bad ecc(computer). also check your motor mounts if you have an old car.
I can't say for sure what the exact cause is of it. however, i had a friend with a manual transmission Honda Civic that would do the same thing, he says it has something to do with the O2 sensor. so that gives you a starting point to find the problem idle airflow metre is more than likely the problem It may have a clogged (fouled) fuel filter.
you have to turn the idle screw down ?? ? ? ? ? ? ? ? ? ? there are 2 of them. one on the right and one on the left. the left one is general idle and the one on the right is for air-conditioning idle and high power output idle ( rev higher ) A vacuum line may have come off if it has started revving.
You may need to adjust the throtle or idle of the car. In older cars this is as simple as tightening a cable. So when the car is just idling it will naturally rev higher and not stall.
Typically this is caused by the load being removed from the engine, allowing it to rev faster and thus idle higher.
The most common cause of engine surging (rev up and down) is a dirty air filter.
need to check your evap system or you have a blown head