Car Rough Idle No Check Engine Light

If your car is idling rough but there’s no check engine light on, it can be frustrating trying to figure out what’s wrong. Here are a few things that could be causing the problem:

Vacuum Leak

A vacuum leak is a common cause of rough idling. When there’s a leak in the vacuum system, it can cause the engine to run lean, which can lead to rough idling. Vacuum leaks can be caused by a variety of things, such as loose or cracked hoses, or a faulty intake manifold gasket.

Fuel Injector Issues

Fuel injector issues can also cause rough idling. If a fuel injector is clogged or malfunctioning, it can cause the engine to run rich or lean, which can lead to rough idling. Fuel injector issues can be caused by a variety of things, such as dirty fuel, or a faulty fuel injector.

Ignition Coil Issues

Ignition coil issues can also cause rough idling. If an ignition coil is malfunctioning, it can cause the engine to misfire, which can lead to rough idling. Ignition coil issues can be caused by a variety of things, such as a faulty ignition coil, or a worn spark plug.

Throttle Position Sensor Issues

Throttle position sensor issues can also cause rough idling. The throttle position sensor tells the engine how much fuel to inject, and if it’s malfunctioning, it can cause the engine to run rich or lean, which can lead to rough idling. Throttle position sensor issues can be caused by a variety of things, such as a faulty throttle position sensor, or a loose or damaged throttle cable.

EGR Valve Issues

EGR valve issues can also cause rough idling. The EGR valve helps to reduce emissions, and if it’s malfunctioning, it can cause the engine to run rich or lean, which can lead to rough idling. EGR valve issues can be caused by a variety of things, such as a faulty EGR valve, or a clogged EGR passage.