Car InteriorsAir ConditionersDiy CarOutletsCarsDecorationInteriorsStyleConditioningDIY and craftsCleaningCar AccessoriesThe InternetInternetTapeAccessoriesDecorThe O'jaysYou slip behind the wheel for the morning commute. The engine starts easily, runs fine while fast-idling down the driveway and down the street for a few miles, but then stalls. You know instantly when the stall occurs because the air horn in the tractor-trailer rig immediately behind you curdles the fluid in your inner ear's semicircular canals when forward motion fails to proceed at an orderly pace. You restart, your car accelerates with a slight stumble, and when you coast to a stop at a traffic light, it stalls again. The stumble and possible stall problem doesn't go away when the engine is warm, so the common cold-engine poor-running possibilities are scratched from your priority checklist. This is more than annoying and as soon as the weekend arrives, the hood goes up.All sensor wires are connected. There's no Check Engine light and there are no trouble codes.

What do you look for now? A disconnected or damaged vacuum hose? Sure, that's a good bet, because many vacuum hoses can be pinched and damaged where it's really difficult to see. But take the time to check them all, making sure they're not only on tight, but not cracked or burned through due to contact with an exhaust pipe or exhaust gas recirculation tube. Don't be surprised if the last hose you check is the one that's damaged. If all the hoses are intact and on tight, there's another possibility that's just as likely: dirt and gum accumulation in the throttle body.Remove any hoses or wires on the air duct connecting the throttle body to the air cleaner housing. Mark which hose or wire goes where to avoid confusion later.To check for this, you've got to remove the intake air duct between the air cleaner housing and the throttle body. First, disconnect all hoses and unplug any sensor wiring connectors. 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.

Next, loosen any clamps, work the duct off the throttle body and set it aside. With the wiring and hoses disconnected, you should not run the engine. Even if it starts and runs, it will log trouble codes, possibly triggering the Check Engine light. Then you'll have to go through a code-clearing procedure--extra work you don't want. Moreover, the computer may have to relearn some driveability trim settings, which may leave you with a marginally running engine for several minutes.does an air purifier work with open windowsOn some vehicles, it's possible to leave hoses and sensors connected and still move the intake air duct safely out of the way. guardian air purification system reviewsIn that case, it would be possible to spray a solvent into the throttle body opening with the engine running. philips air purifier us

However, there's no great advantage to this and, as you'll see, there are reasons why it's not such a great idea.Take a good look inside the throttle body using a flashlight. Operate the throttle linkage to open the throttle plate so you can see past the outside surface of the throttle body. 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. The coating both upsets and restricts the airflow when the throttle is closed or slightly open.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. So be sure to check the intake air duct for cracks, particularly in the "accordion" area where they're not as obvious. 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.Some throttle body bores have a coating to reduce the buildup, but, in time, bores with protective coats can be affected.

There are several ways to clean out the area. The best is with a professional tool called the Intake Snake, which comes with an effective yet safe solvent, and the simplest is with an old worn-out toothbrush with soft bristles and a mild solvent.There are three reasons why you have to be careful, both in choice of solvent and in application: First, if the throttle body has a protective coating (as on many Ford products) to reduce the buildup, a strong solvent and hard brushing will remove it, so you'd have to do the job more often. If you see a warning label on a Ford product, that's why.Second, there may be a sensor tip projecting into a small opening in the area of the throttle plate, and a strong solvent or hard brushing might damage it. In addition, a sensor O-ring seal may be damaged by a strong solvent.Third, the throttle plate shaft is sealed at the mounting holes in the throttle body to prevent entry of unmeasured air (which would upset the fuel mixture). A strong solvent (and hard brushing) could damage the seals.

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