Testing a Throttle Body
Testing a Throttle Body The throttle body in car a provides one of the modern features found in today's cars to help with fuel efficiency. In addition to keeping fuel flow to the engine restricted to only what it actually needs, the throttle body also houses sensors telling the car computer how the fuel-air mixture is working. Unfortunately, when this unit becomes dirty it can also cause car performance problems --- especially in idle and low rpm. Testing the vehicle to find this problem requires a few tests and computer readings. Things You'll Need Car keys OBD-II Scanner Instructions Turn on the car, and let it warm up. Drive it around a bit so the engine is warm. Stop the car, and let it idle. Allow the car idle to level out to its lowest state. Listen to the car operate to determine whether the engine is struggling to maintain a constant idle (rpm will fluctuate in idle). Try to trigger the "Check Engine" light warning by getting the e...