Check Engine Light On and Car Shaking When Stopped

Possible Causes

There are a number of possible causes for a check engine light to come on and a car to shake when stopped. Some of the most common causes include:

• Misfiring engine: A misfiring engine can cause the car to shake and the check engine light to come on. This can be caused by a variety of problems, such as faulty spark plugs or ignition coils.
• Vacuum leak: A vacuum leak can cause the car to run lean, which can lead to shaking and a check engine light. This can be caused by a variety of problems, such as a cracked hose or a loose vacuum line.
• Fuel injector problem: A fuel injector problem can cause the car to run rich or lean, which can lead to shaking and a check engine light. This can be caused by a variety of problems, such as a clogged injector or a faulty fuel pump.
• Transmission problem: A transmission problem can cause the car to shake when stopped, especially if the transmission is slipping or shuddering. This can be caused by a variety of problems, such as a low fluid level or a worn clutch.
• Motor mount problem: A motor mount problem can cause the car to shake when stopped, especially if the motor mounts are worn or broken. This can be caused by a variety of problems, such as excessive vibration or a hard impact.

Diagnosis

The first step in diagnosing the cause of a check engine light and car shaking when stopped is to read the trouble codes. This can be done using a code reader or by taking the car to a mechanic. Once the trouble codes have been read, the mechanic can use them to narrow down the possible causes of the problem.

In some cases, the mechanic may be able to diagnose the problem based on the symptoms alone. For example, if the car is shaking violently and the check engine light is flashing, this is a sign of a serious problem, such as a misfiring engine. In other cases, the mechanic may need to perform further tests, such as a compression test or a fuel pressure test, to diagnose the problem.

Repair

The repair for a check engine light and car shaking when stopped will depend on the underlying cause of the problem. In some cases, the repair may be as simple as replacing a spark plug or a vacuum hose. In other cases, the repair may be more complex, such as replacing a fuel injector or a transmission.

It is important to have the problem diagnosed and repaired as soon as possible. Driving with a check engine light on can damage the car’s engine and other components. Additionally, driving with a car that is shaking can be dangerous, as it can make it difficult to control the vehicle.

Conclusion

If your car’s check engine light comes on and the car is shaking when stopped, it is important to have the problem diagnosed and repaired as soon as possible. There are a number of possible causes for this problem, so it is important to have the car inspected by a qualified mechanic to determine the exact cause. Once the cause of the problem has been determined, the mechanic can recommend the best course of action to repair the problem.