Throttle body cleaner11/6/2022 ![]() ![]() Some throttle body bores have a coating to reduce the buildup, but, in time, bores with protective coats can be affected. Most deposits, however, are from oil and combustion gases transferred from the positive crankcase ventilation system and pushed forward by normal engine pulsation as the intake valves close and open. So be sure to check the intake air duct for cracks, particularly in the "accordion" area where they're not as obvious. #Throttle body cleaner crack#Where do these deposits come from? Some are in airborne dirt that gets through the air filter or past a crack in the intake air duct. The coating both upsets and restricts the airflow when the throttle is closed or slightly open. If you see a coating of dirt and oily film on the inside wall of the throttle body or the edge of the throttle plate, you've likely found the problem. Operate the throttle linkage to open the throttle plate so you can see past the outside surface of the throttle body. Take a good look inside the throttle body using a flashlight. However, there's no great advantage to this and, as you'll see, there are reasons why it's not such a great idea. In that case, it would be possible to spray a solvent into the throttle body opening with the engine running. On some vehicles, it's possible to leave hoses and sensors connected and still move the intake air duct safely out of the way. Moreover, the computer may have to relearn some driveability trim settings, which may leave you with a marginally running engine for several minutes. Then you'll have to go through a code-clearing procedure-extra work you don't want. Even if it starts and runs, it will log trouble codes, possibly triggering the Check Engine light. ![]() With the wiring and hoses disconnected, you should not run the engine. ![]() Next, loosen any clamps, work the duct off the throttle body and set it aside. If there's a chance you could confuse a hose connection or wiring connector, put a piece of masking tape on the hose or connector, another on the hose neck or sensor, and mark each with the same letter. First, disconnect all hoses and unplug any sensor wiring connectors. To check for this, you've got to remove the intake air duct between the air cleaner housing and the throttle body. Mark which hose or wire goes where to avoid confusion later. Remove any hoses or wires on the air duct connecting the throttle body to the air cleaner housing. ![]()
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