2005 chevy cobalt LS 2.2L. I cleaned the TB with Sea-Foam on a rag, now it idles around 1700-2100 rpm's. I've rechecked my work multiple times and nothing. There is a lot of talk about this issue but I have not found any solutions. I even tried replacing my TB and found no change. Any ideas??? -Thanks.

I would recommend cleaning the throttle body with carburetor cleaner, remove the air inlet to the throttle body and try cleaning. After cleaning will be hard to start but should solve your issue

I had a very similar problem to the one you're having in my 90 single cam. Seems to be kinda notorious with 240sx. Step one buy yourself some maf cleaner. Has to be maff cleaner not carb cleaner. Disconnect battery. Unplug maf sensor and take out maf using a screw driver and/ or a 10mm wrench. Place maf on towel and spray liberally about 6 inches away. Don't use anything to clkean it just use the spray. Let it dry and plug everything back in. Step 2. buy some carb/ throttle body cleaner. Remove hose between tb and plastic intake hose and spray tb cleaner in tb. Rag off whatever dirt you can get. Now turn on car and with sonmone reving var to 2k spray 2 second bursts of tb cleaner into tb cleaner following label instructions. Continue doing untill you see no more dirt. Turn off car. Step 3. Remove aicv. (Air idle control valve. This is attached to tb by 4 10mm bolts. Be easy with these as not to break them in the tb. Once aicv is removed place on rag and using carb and tb cleaner spray liberally. Make sure you get all nooks and crannies. Let dry for 20 mins and replace. Lastly replace engine coolant temp sensor. Its 12 bucks at autozone and take 1 your on your dual cam. There are many write ups on zilvia and 240sx forums for this. Lastly set idle to 700 rpm by disonnecting trottle sensor and adjusting the screw on the aicv to 700. And then plugging the trottle sensor back in. This shgould fixc your idle problems and stalling proiblems. If not email me at [email protected]. I'll give you more suggestions. Let me know if this works

your gas pedal sends a signal to it, its drive by wire not cable like in the old days, the motor moving the throttle under the hood is probably bad

first check the throttle plate for carbon build up the look for the knock sensor harness rubbing onto the fan shroud

Put the sea foam in your tank usually I add some every 6 months it works well check out the wires on your starter they maybe corroded check your battery terminals and clean them up.

Had the same problem with mine. Check and clean your throttle body, as well as all hoses leading from you air filter all the way to the engine. Took a bottle of carb cleaner, a rag, and some q-tips.

you need a tune up...plugs, possible wires too, they might have a lot of carbon tracking deposits on them ...clean (IAC) sensor, if you"ve never cleaned it, believe me it"ll be dirty.. and then make sure you completely clean you throttle body too inside and out! but wait an hour after before starting to let it air dry...clean air filter or replace it, and replace fuel filter if it hasn"t been replace in a long time. also after you"ve done this purchase a can of Sea Foam fuel system cleaner $10 and pour 1/2 can into 1/2 tank of gas and drive around even if its running "a little rough", for about 30 minutes and this should clean out any fuel injectors that may be possibly clogged up! if you you cant drive the car but will idle only after cleaning (idle air control), pour some seafoam in the tank and let it idle for about ten minutes then try to see if it will run. If none of this works then you probably have a fuel pump not putting out the correct pressure!

It's common that you get a lot of carbon build up at the base of the throttle body. Give it a good spray cleaning with injector cleaner and dry it with a hair dryer. If you find it still to dirty, you can try it again with a second can or if you can try using Sea Foam that you can buy at an auto parts store like Auto Zone. The Sea foam will clean out the carbon but also create a lot of smoke.
When i say lot's of smoke, just do a search on You Tube for Sea Foam. Good luck and hope this helps.

Scan for codes, post any that are found, it could be a bad TPS sensor. Could also be a build up of carbon on the top (valve) portion of the engine. Try a few cans of "Sea Foam" through the intake manifold.

I WOULD TRY AND RUN A BOTTLE OF SEA FOAM THOUGH IT BEFORE REPLACING PARTS. YOU CAN GET SEA FOAM AT ANY AUTO PARTS STORE FOR ABOUT $9.00 A CAN.