My idle was going up and down, I was told to clean the throttle body and the butterfly my hand with carb cleaner, and now my idle is around is around 2500-3000 rpm, when i come to a stop, after a few seconds it will drop down around 2000 rpm, and i noticed that the butterfly isn't sitting level like it should
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Re: idle too high on a 06 cobalt
When you clean it make sure that you hold the butterfly open so you can get the spots clean that need it. If there is anything in the way the butterfly will not close. Just a small bit of dirt will do this .
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In theory once the desired idle speed is programmed into the management system, in the absence of such faults as air leaks, sticking idle air control valve and suchlike it should be impossible for the idle speed to be much different from the programmed value because the ECU should continue closing down the amount of air bypassing the throttle butterfly until the idle is around the correct value.
I think you need to go back to basics and double-check the work to ensure everything is as it should be. In the absence of mechanical faults and ignoring the possibility of electronic problems a high idle must be caused by too much air entering the engine, either because the idle air control valve is not closing properly or because the throttle butterfly is not closing fully.
It is worth noting air can enter the intake through leaky diaphragms, split vacuum hoses or faulty pcv systems. It is also worth checking the egr valve if fitted.
When it idles rough it could be several things but, an easier thing you can do 1st is cleat the throttle body of any carbon(black stuff) with throttle body cleaner or something like carb cleaner. Ive used brake cleaner sometimes. But yea, look up your cars info about your motor and just clean all the black carbon off of anything at the throttle body and you may even need to take some of it apart to get down in there with a rag, little cleaning brush and the cleaner. Clean the thing you can move by hand called a "butterfly".
This type of problem needs to be approached with diligent process of elimination to properly diagnose.
Check for vacuum leaks...with the engine running, spray carb cleaner at each joint and seal along the intake system and intake plenum. If there is a leak the engine idle will change as the spray is taken in through the leak.
The idle air control valve could be faulty or dirty. Remove the idle air control valve and clean the interior with carb cleaner.
There could be deposits in the thottle body causing the throttle valve to stick open. Check for free operation of the throttle valve. Clean the throttley body with throttle body safe (NOT car cleaner) cleaner by removing the intake hose, spraying the cleaner on the paper towel and cleaning the interior of the throttle body while holding the throttle butterfly plate open.
Make sure the throttle cable moves freely and that the return spring is present and working properly.
To go beyond this may require special diagnostic tools.
Try cleaning your throttle body. Over time on high mileage vehicles, the throttle body butterfly valve will gunk up with sludge, and dirt. This will prevent air from entering the intake manifold while the engine is idling, causing low idle/stalling. A can of throttle body/carb cleaner will do the job. First, remove the intake tube to get to the butterfly valve. Spray a small amount of throttle body cleaner directly into the intake, and wipe any excess fluid with a cloth. Also, inspect your air filter. I hope this helps Matt
if its drive-by-wire, remove the intake pipe to the throttle body. have someone get into the driver's seat, turn the ignition ON, and leave ENGINE OFF! have the driver put the acclerator pedal all the way down to the floor as that will open the throttle bodys butterfly valve. Now grab a rag, spray some carb cleaner on the rag and wipe that throttle body's insides clean! be sure whoever is in the drivers seat with there foot on the gas does not let go while your hands are in the throttle body as it can pinch and it does hurt! hope I helped, please rate!
Your ad is showing 2 different years in it. If it is an 89, there should be an IAC which stands for idle air control in your throttle body. You simply unplug the wires and then unscrew it out of your throttle body. Inspect it for crud build up on it. Look in the hole that you took it out of and inspect it also. You can spray carb cleaner in there to help clean it out. Re-install the IAC and see if it makes a difference. You may have to replace the IAC with a new one. Also make sure your butterflies are closing on your throttle body. You can spray carb cleaner in it also to help clean. Also you can spray some on a rag and wipe out around where the butterflies contact the throttle body.
should never clean the throtal body on these cars unless absolutely nessasry. and if you do have to clean them dont move the plate and just use a rag sprayed with carb/throtal body cleaner on it. never spray the throtal body. probably needs replaced. try a junk yard ?
try getting a can of carb cleaner . removing breather and spraying gunk out of the inside of carb to free moving parts that are sticking. and also try spraying the outside moving parts of carb with penetrating oil
Check the throttle body and see if it has build up around the butterfly. If so, clean the butterfly with throttle body cleaner. This may be it. There are other possibilities but this is a simple inspection.
Sounds like your idle air control valve is going out on you. The IAC is located on the throttle body which is where the air duct tube ends coming from the air filter. It is held on by a couple of screws and is easy to replace. Let me know if you have any questions. Thanks for rating my response and for using FixYa!