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How to Clean a Toyota Camry Throttle Body The throttle body on a Toyota Camry controls and mixes the air and fuel that goes into the engine. As air comes into the throttle body through the air intake, suction created by the throttle body design draws fuel in from a chamber located inside the throttle body housing. This fuel mixes with air and is sent into the combustion chamber to be ignited. Over time, contaminates in the gasoline (from low grade gas suppliers or from rust inside the gas tank) may create a buildup of debris inside the throttle body. Carbon can also build up from the heat and burning of fuel generated from combustion inside the engine. If you want to make sure that your throttle body functions properly, it will help to know how to clean a Toyota Camry throttle body. Things You'll Need Screwdrivers (flat tip and Phillips head) Throttle body cleaning brushes (or several soft bristle toothbrushes) Throttle body cleaner Masking tape Permanent marker Clean rag or...

How to Reset the ECM on a Chevy Truck Every Chevrolet truck has an engine control module that manages the electronic components of the engine and monitors sensors for errors. Returning the ECM to its factory state may be necessary to troubleshoot or resolve a number of problems. Things You'll Need Wrench or socket set Instructions Remove the nut from the negative battery cable using a socket set or wrench. Slide the cable off of the battery and set it aside. Turn the headlight switch to the "On" position to drain the ECM of any remaining power. Wait at least 10 minutes, then turn it back to the "Off" position. Replace the negative battery cable by reversing the previous steps. Tighten the nut until it feels secure, paying attention not to overtighten it. The ECM has now been reset.

1990 Chevy Truck Problems When a truck becomes almost 20 years old and has more than 150,000 miles on it, a tune-up will probably help, but some new sensors for the throttle body will probably go a long way in making the truck run smoother. It is also probably time for some new brake calipers and brake pads. Throttle Body The 1990 Chevrolet pickup does not have a regular carburetor; a throttle body with sensors is used instead. A computer lets the sensors know when and how much air and fuel to place in the motor, so when these sensors are not working properly, the engine runs rough. There are two main sensors in the throttle bottle that can have a major effect on how well the engine is running. The first one is the idle control sensor, and the second is the temperature sensor. If your engine is running rough, try replacing both of these. The temperature sensor looks similar to a spark plug and screws into the intake manifold close to the throttle body. The idle control se...

Signs & Symptoms of a Bad Throttle Position Sensor A throttle position sensor is used to monitor the position of the throttle in an internal combustion engine. The throttle position sensor is usually positioned directly on top of the butterfly system. Motor Activity A bad throttle position sensor may cause the car to unexpectedly buck or jerk around. It may also cause random surging of the engine when the car is idling. Stalling Cars with a faulty throttle position sensor may randomly stall for no apparent reason. This can happen whether the car is in motion or simply idling. Accelerating One of the signs of a bad throttle position sensor is a slight hesitation in the response time of your engine when you are attempting to accelerate. Highway If your car randomly increases its speed while driving on the highway, you may have a problem with your throttle position sensor. Engine Light When you have a problem with your throttle position sensor, your car's servic...

What Is a Throttle Body? Internal combustion gasoline engines require three things to operate: oxygen, fuel and a spark. On modern engines, fuel delivery and spark timing are handled by a computer controlled system of pumps and actuators. Air delivery is a bit more analog, which is where the throttle body comes in. Function Throttle bodies are essentially air valves, and can take a number of forms. Most are butterfly valves, but barrel-type and pinch valves have also been used. Jupiterimages/Comstock/Getty Images Precedents Prior to fuel injection, air delivery was modulated by a set of butterfly valves set into the base of an engine's carburetor. Paulbr/iStock/Getty Images MFI Throttle Bodies Most engines use Multi-Point Fuel Injection (MFI.) In these systems, the throttle body is responsible only for modulating air delivery. Pawel Gaul/iStock/Getty Images TBI Systems Many older engines use Throttle Body Injection (TBI.) These throttle bodies r...

How to Know When Your Throttle Body Needs to Be Cleaned In most modern vehicles some of the exhaust is routed back into the engine through the throttle body, part of the air intake system. This leads to less air pollution, although some of the post combustion products in the exhaust can coat the inside of the throttle body. This can lead to a loss in vehicle performance, especially stalling and stumbling when the engine is warm. There are several indicators that your throttle body needs cleaning. Things You'll Need Socket wrenches Screwdrivers Check your gas mileage. This can be as easy as filling your tank to full and setting the trip odometer to zero. When the tank is empty, observe how any miles you were able to go on that one tank. If you notice that you are getting fewer miles to the gallon than your car should be getting, you may need to clean your throttle body. Fai Wong/Hemera/Getty Images Observe your car when it is idling. When in idle, if the eng...

Throttle Body Injection Troubleshooting The throttle body in a car provides the control of air and fuel injection so that the system runs efficiently and does not backflow. When this automotive part is not working correctly, or its electronic sensors begin firing off readings to the onboard diagnostic computer showing problems, it can create car problems. Not only does a malfunctioning throttle body have the capability to cause the check engine light to come on, it can also cause other sensors to overcompensate, causing other problems elsewhere. Typical related issues will include the oxygen sensor and the mass air flow sensor. As a result, automotive diagnostics of a troublesome throttle body can include a process of elimination with other parts as well. Things You'll Need Shop-vac vacuum cleaner New air filter Mass air flow cleaner Screwdrivers Torque screwdrivers Shop rag O2 sensor tool OBD scanner Flashlight Carb cleaner Socket wrench and sockets Crescent wrenc...