Check for a vacuum leak somewhere. It might just be a cracked rubber vacuum line. Try short sprays of starting fluid at or near a suspected vacuum leak. You'll hear the engine idle speed change immediately if you find a leak.
If it hasn't been changed, it has Throttle Body Injection (TBI). It looks similar to a carb but it will have wires running to it.
Throttle Body Injection (TBI) Aprox. 9 - 13 psi with key on, not running and a 3 -10 psi drop when running at idle. Multiport Fuel Injection (MFI) Aprox. 41 -47 psi with key on, not running and a 3 -10 psi drop when running at idle. Central Multiport Fuel Injection (CMFI) Aprox. 58 -64 psi with key on, not running and a 3 -10 psi drop running at idle. Central Sequential Electronic Fuel Injection (CSEFI) Aprox. 55 -61 psi with key on, not running and again the 3 -10 psi drop running at idle.
Doesn't a 94 Buick have Throttle Body Injection? Try running injector cleaner through the fuel system first. As always, follow the manufacturers recomendations.
With key on engine not running pressure should be 9 to 13 psi Engine at idle pressure should decrease by 3 to 10 psi on a throttle body. On a multi port injection key on engine not running pressure should be 41 to 47 psi. Engine running at idle pressure should decrease 3 to 10 psi. Central multiport fuel injection key on not running should be 58 to 64 psi. Engine running at idle pressure should decrease 3 to 10 psi. Central sequential electronic fuel injection key on not running pressure should be 55 to 61 psi. Engine running at idle pressure should decrease 3 to 10 psi.
Throttle position sensor is located on the side of the throttle body-in line with the throttle shaft. To locate the throttle body, you can have someone repeatedly push the accellerator pedal (with the engine not running) while you look for the moving throttle shaft. Drew
There are multiple causes of high idle on this application. They include throttle cable out of adjustment, IAC problems, evaporative emission failure, and vacuum leaks (among others). This is a critical safety issue due to the possibility of uncontrolled throttle and must be diagnosed and serviced by qualified mechanic.
Put a used one on from a running one
no
The throttle position sensor determines the amount of throttle used when the engine is running at various speeds. If the sensor is faulty, it can be replaced by ordering a new part.
Passenger side of engine next to throttle body. It is the senor with the vacuum line running to it.
probably failed throttle bypass solenoid or possibly throttle position sensor
Programs that are running but not in use are running in the "background."