I have carbon build up in my throttle body and cnt seem to figure out where its coming from i have cleaned the throttle body out several times and the build up always returns.. what should i look for i dont have a catylitic converter on the car could that be causing the carbon build up or is it the ever so expensive egr valve

When it starts sticking or when you or when you open the butterfly and see carbon and oil build up I clean mine every time I change plugs hope this helps

The accelerator cables? Spray them up good on the outside with a penetrant spray, like WD-40.
The problem with sticking throttle body parts (like the butterfly valve, and the idle control valve) is not carbon deposits, it is coking deposits. This is from air impurities. Remember that a hose from the PCV system is routed back into the air intake-this carries a lot of impurities. Over time, coking deposits will build up. Air passages controlled by the idle control valve will get these coking deposits. I'm not sure how much the internal carbon cleaning helped the throttle body.
I believe I would get a second opinion- I have never heard of an idle valve that can't be taken off and cleaned.

Hello, the first thing you need to do is check the throttle body bore for carbon build up. pretty common to have the the throttle body build up carbon between the throttle bore and throttle plate causing some unstable idle problems. you can clean out the throttle body bore with some throttle body cleaner and a shop rag

yea id definately try cleaning ur throttle body 1st. My 03 1500hd had the exact same bad idle after my battery went bad it would die at lights unless i kept foot on gas i cleaned throttle body runs perfect now took 30min cost 8$ for cleaner at autozone and theres how to videos on you tube

Hello: The idle is controlled by the electronic throttle actuator. If the check engine light is NOT on the you may have carbon build up in the throttle body. If it idles to slow and/or stalls when coming to a stop the you have carbon build up. Get a can of carburetor cleaner, remove tube going to the throttle body, get a soft cotton rag, spray carburetor cleaner on it, open the throttle plate by hand and clean the inside of the throttle body and the throttle plate. When done put back together, turn key on for10 seconds and off for 10. seconds. That should correct the problem if it idles to slow. Do not spray cleaner straight into the throttle body, you could blow up the engine.

Hello: Sounds like you have carbon build up in the throttle body, remove the air tube going to the throttle body get some carburetor cleaner, sprat it on a clean rag, clean the carbon off the throttle plate (open it with you hand) clean carbon off the walls of the throttle body. Do NOT spray Cleaner into the throttle body as if to much liquid gets in you could destroy the engine. When done Turn key on for 15 seconds shut key off for 30 seconds do this 2 more times to allow the computer to re-learn the throttle plate setting

Hi, the throttle body can get carbon build up, resulting in a low idle, or possible check engine light. The carbon build up can be cleaned. The most effective way, is to actually remove the throttle body, and clean the throttle plate, and air flow ports, with a good spray choke cleaner. This is available at an auto parts store. Once reassembled, the low idle situation will be resolved. Good luck...Coop

Buy throttle body cleaner at your local parts store. Take the big intake hose off that is connected to the throttle body and air filter housing. Open up the butterfly (like you're controling the throttle at the engine). Spray this cleaner inside the throttle body, around the butterfly, where it motions back and forward on the pin. You will see a lot of carbon build up run out. Do this 2-3 times. It doesn't take a lot to clean it, just a couple of quick sprays. Wipe it clean with a clean cloth or rag. Put it all back together. It will seem hard to start for a few turn overs, but this is from the cleaner and it will dry out quick. What happens is, over time this carbon builds up where the butterfly closes and it gets (stuck) on this build up, which causes you to push harder on the gas pedal or it will not close completely. They charge will charge you like $250+ to do this and usually it's just build -up. Try it and let us know how it works for you. The cleaner $5

Try this: Go to your local parts store and purchase a can of (throttle body cleaner) you will take your air filter out and remove the big tubing that is connected to your throttle body and filter housing. Spray the cleaner inside the throttle body, open the (butterfly) and spray around the pivot the butterfly opens and close on. What happens is you get carbon build up in these areas and it causes the gas pedal to feel like it's stuck and have to apply more pressure to the pedal. You will see alot of black carbon run out of the throttle body. Take a clean rag and wipe down the area of the throotle body. Repeat the cleaning 1-2 times. put your air inlet tubing back on and re-install your filter. It may seem hard to start at first but it's drying out the cleaner that was sprayed inside the body. Try this and see if this works. I've done this on many vehicles that shops want to charge $300 to do and all you need is $5 cleaner. It's very easy to do and takes 20 min.

It could also be carbon build up on the throttle body, but regardless the cure is the same. Your going to need to clean the throttle body and the idle air control valve (IAC). With a can of throttle body cleaner, (follow instruction on the can) clean the throttle body blade and the IAC passage way in the throttle body. Once the throttle body is cleaned, with the engine off, turn the ignition key to the on position (engine not running) and wait for 30 seconds and then turn if off for 10 seconds and then start it. This should reset the IAC, if it did not work do it again and see if it helps. If not clean out the IAC passage way again. The turning on and off the ignition reset's the IAC and it may still be stuck with carbon build up. Once the engine has started, Note there will be lots of smoke form the tail pipe, that's normal. It's just the left over throttle body cleaner and carbon being burn off, take's not more then 10 min to burn off. Good luck and this should keep you from replacing the IAC. Oh and don't use Carb cleaner, Carb cleaner is to corrosive to the throttle body gasket.