first check for battery voltage to the valve by probing the wires of the electrical connector with a volt-meter it should be about 10.5 volts if not it's probably bad.next remove the valve and check the pintle inside the valve ports for excessive carbon deposits clean the valve ports and pintle with carburetor cleaner and replace the valve if idle does not improve replace the isc valve with a new one.
Lots of Monte questions! This is a question with a easy answer for a difficult reason. The idle speed on any 1995 to 2001 Monte Carlo is handled by a thing called the Idle Air Control(IAC) valve. What the valve does is regulate the amount of air that bypasses the throttle plate. The IAC valve is controlled by the Powertrain Control Module(PMC). The PMC is the black box we often called the cars "computer". The IAC valve can be checked with an ohmmeter and is either good or bad. The valve can't be adjusted nor can you mechanically adjust the engine's idle. The PMC also knows what's going on with your catalytic converter because it can read the O2 sensors and match that with other engine data. Long before the catalytic converter were to actually get "stopped up" the PMC would tell the "check engine light" to start yelling at you from it's location in the dash.
The IAC is a small motor on the throttle body that screws a giant needle valve ("pintle") up and down. It regulates how much air is allowed to bypass the closed throttle plate, thereby controlling the idle speed. It moves up for example when you turn the a/c on, to kick it from the usual 900 to 1100 rpms. It's movement is controlled by the PCM (powertrain control module), to maintain the desired idle speed. There is not much to the throttle body... the throttle plate itself, the IAC motor (idle air control), attachments for vacuum lines, and a TP (throttle position) sensor to tell the computer what percentage the throttle is open.
EFI cars dictate idle through direct output from the ECU, based on information it gains from the coil, engine temp (block sensor), cam revs (sensor) and throttle position sensor (on the throttle, a potentiometer usually). Idle is actually controlled by the ECU based on that info through a throttle bypass solenoid valve. This valve can get dirty and you can tell if there is a fault if the idle does not change on engine load (like when the aircon goes on). Take the valve off and clean it. The TPS sensor can go wrong also as the ECU then does not know what the throttle is doing. Hope that helps
sorry to tell you buddy but the i.a.c ( idle air control valve ) you killed it you never want to spry anything on that part of the electronic fuel system go buy you a new one and reset the memory by removing your posisssstive battery cable for about a minute and i would just about bet it works just fine after ! i only know because i did it myself some time ago. Good luck BIG J W
first, inspect the idle air control valve for carbon build up. if it is dirty, you may remove it to clean it, (which i did), or use seafoam. a dirty iacv can dramatically effect idle. the idle on your subie is set by the electronic control module and even a subie mech will tell you there is no adjustment. however, and this is not recommended by any mechanic. on the iacv there are two mounting screws that can be turned to make adjustment to the amount of air flow at idle. the iacv is preset at the factory and is not supposed to be touched there after. ive read people who have done it and had no problems at all. i would try both of these suggestions in their respective order before spending the enormous amount of money on a subie mech or replacement of the iacv.
: Hi there, try this, if you disconnected your battery the computer has to learn to do it again ....so disconnect it again and then put it back . when you start the car run it as close to idle seed as possible then take it out for a run on all road condtions for about 5k. that should do the trick.THE ONLY WAY IS PROBABLY WITH A NEW CRANK SENSOR ON MY 1999 IT AS EASY TO CHANGE SOME AUTO PARTS TELL YOU ITS A DEALER ITEM BUT IF YOUR NEAR A NAPA STORE TRY THEM FIRST The idle on most computer-controlled fuel-injected vehicles is not adjustable, per se. The computer controls the idle speed. There are probably other issues. If the vehicle starts and runs, it's not the crank sensor, which has no control of idle speed.
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