2. Check the throttle position sensor (TPS). The TPS is responsible for telling the engine control unit (ECU) how far the throttle is open. If the TPS is faulty, it can cause the engine to race. To check the TPS, use a multimeter to measure the voltage between the TPS signal wire and the ground wire. The voltage should be between 0.5 volts and 4.5 volts. If the voltage is not within this range, you will need to replace the TPS.
3. Check the fuel pressure regulator (FPR). The FPR is responsible for regulating the fuel pressure in the engine. If the FPR is faulty, it can cause the engine to race. To check the FPR, use a fuel pressure gauge to measure the fuel pressure. The fuel pressure should be between 30 psi and 45 psi. If the fuel pressure is not within this range, you will need to replace the FPR.
4. Check the vacuum hoses. If any of the vacuum hoses are cracked or disconnected, it can cause the engine to race. To check the vacuum hoses, inspect them visually and look for any cracks or disconnections. If you find any cracks or disconnections, replace the vacuum hoses.
5. Check the exhaust system. If the exhaust system is blocked or restricted, it can cause the engine to race. To check the exhaust system, look for any obstructions in the exhaust pipe or muffler. If you find any obstructions, remove them and clean the exhaust system.
