whats the problem for my 94 ford van engine high and low idle
why does my 4.75 BRIGGS & STRATTON lawnmower engine idles high and low when cutting my grass
Bad idle may refer to many things. Generally it means the idle is too high, too low, or there are misfires.
There is not a low idle screw. The computer sends a signal to the idle air control motor and it does the adjusting accordingly. If your idle is to high and your check engine light is on then you need to go to a repair shop and have them diagnosis the problem.
The idle speed is computer controlled. There is no adjustment. If the speed is too high or low, there is a sensor/actuator/wiring issue.
You don't. The ECU controls the ISC (Idle Speed Control Motor) which adjusts the idle. If idle is out of control (too low or too high) try gently tapping the ISC with a small (0.5 pound) hammer or a large wrench while the engine is running. If tapping the ISC makes a change in idle speed, you need a new ISC. Clean the throttle body whenever replacing the ISC. If the ISC is not the problem, look for vacuum leaks which can cause both high and low idle. Low coolant level can cause high idle. Also, note that many clueless drivers assume that the idle is wrong (high) when the car is just using high idle (normally) for a short time after a cold start especially in cold weather.
A bad idle control module will make it race up to about 3000 r.p.m. when in park.
95 eclipse has a low idle
If your vehicle is idling high to low when its not moving, chances are you have an issue with the transmission. It may need to be replaced fully or simply fixed.
Could be Throttle Position sensor... it will make it idle high, and also it can make it idle low... it opperates the injectors, firing and all... a vehicle can run without the TPS but it will run rough.
low idle and uneven idle
The engine will idle up and down usually. It can also idle high or real low. But other things factor in on how the idle air works