Usually, a faulty sensor that doesn’t send the correct information to the computer may cause the engine to idle rough or stall: crankshaft and camshaft position sensor, ignition control module, fuel pump, possibly EGR valve stuck open, idle air control valve stuck open.
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- What sensor controls idle speed? An idle air control valve, also called an idle air sensor control motor, is an electrically operated valve that controls the amount of air that bypasses the throttle plate in cars with a fuel injection system [source: Autozone]. This causes the idling speed of the engine to change as needed.
- Can EGR cause misfire? Yes, a bad EGR valve can cause a misfire. When the EGR valve is not functioning properly, it can cause the engine to misfire. The EGR valve is responsible for recirculating exhaust gases back into the engine.
- What happens when you unplug MAP sensor? With the MAP sensor disconnected, the fuel delivery will be excessive and could cause harm to the engine and exhaust system (catalytic converters). Your vehicle getting on the freeway accelerating, bogging down, and reaccelerating sounds like fuel starvation. It could be a fuel pump fault or a plugged fuel filter.
- Does cleaning an EGR valve work? Why should you clean the EGR valve? A clean EGR valve can reduce the amount of nitrous oxide emitted from your car. Also, cleaning the EGR valve can help increase the longevity and performance of your car's engine. An unclean EGR valve can damage both your vehicle and the environment.
- What happens if the EGR valve is stuck open? Open Position: Rough idling and problems with acceleration are the two most common indicators that the EGR valve is stuck open. The truck might also stall excessively. When the EGR valve is stuck open, all of the exhaust gas cycle back into the chamber, meaning there's not enough oxygen for a combustion to take place.
- Where can I spray my EGR valve cleaner? Applications. EGR Cleaner by Valvoline can be applied to an EGR valve, air intake system, manifold, or inlet valve. It aids in maintaining manageable levels of carbon deposits, optimising system performance, and prolonging its operating life.