Though any malfunction in the engine could be indicated by a blinking light, a flashing light is more worrying than a regular one. A check engine light flashing while the car is vibrating normally indicates that something is wrong with the engine and is usually associated with the misfire of the engine.
A check engine light is a clear indication that your car will do some damage to its catalytic converter unless something is done right away. We regularly encounter drivers who have seen both sides of this scenario here in Maclane’s Automotive.
While there are many causes, most of them can be repaired. However, driving just “a little further” without checking the issue will only increase the repair costs and possibly result in major repairs down the road.
What A Flashing Check Engine Light Means
There are many reasons why the light may turn red or yellow, from low oil pressure to a damaged oxygen sensor. In case of the constant blinking of the light, however, the problem may be the misfiring of the engine. In such situations, raw fuel may be sent into the exhaust system, heating up the catalytic converter.
Replacement of this part costs quite a lot of money. The reason for the vibrations is the malfunction of the engine. In some cases, you can notice just mild vibrations when your car is idle, while in other cases, they occur while driving the car.
Common Reasons Your Car Shakes And The Light Flashes
Misfires have a few repeat offenders we run into all the time. The exact cause depends on your vehicle, mileage, and maintenance history, but these are some of the most common:
Ignition Problems (Spark Plugs, Coils, Wires)
Spark plug wear without timely replacement and damaged ignition coils could result in misfiring, with even a malfunctioning coil from the coil-on-plug type causing engine problems akin to limping on one foot.
Fuel Delivery Issues (Injectors, Pump, Pressure Problems)
Blocked or malfunctioning fuel injectors and low fuel pressure during acceleration or climbing hills can both cause engine misfires.
Air And Vacuum Leaks
Any unmetered air entering the intake system may mess up the air-fuel mixture and lead to poor engine performance. Vacuum leaks, intake boots, and intake manifold gasket leaks are all possible.
Engine Mechanical Issues
Lower compression, valve problems, or internal wear can cause persistent misfires that do not go away with basic tune-up parts. This is one reason proper testing matters before replacing parts.
Sensor And Control Issues
Malfunctioning of the mass airflow sensor, crank sensor, or the whole engine management system may lead to misfires. Sometimes, the problem may seem to be only temporary as it happens “once in a blue moon.”
What You Should Do Right Now
In such a case where your vehicle is trembling intensely with reduced power and a strong smell of gasoline, it’s vital to halt its use right away by seeking roadside assistance.
Below are some useful recommendations to prevent further harm:
- Ease off the accelerator immediately, avoid hard acceleration, and don’t try to “power through” the shaking.
- If the flashing continues, keep driving to a minimum and get the vehicle inspected as soon as possible.
If the light stops flashing and becomes steady, the vehicle may still have a stored misfire code. It still needs diagnosis, but the immediate risk may be lower. Either way, the shaking is your clue that something is still not right.
What To Expect During Diagnosis?
When you bring your vehicle to our professionals for care, we focus on confirming the cause instead of guessing. Misfires can feel similar from the driver’s Diagnostic trouble codes along with freeze frame data should be inspected, as it will enable us to identify the exact scenario when the issue happened. We need to check for engine misfires, analyze the ignition system, fuel pressure, vacuum leaks, and verify the sensors to accurately identify and resolve the issue, ensuring your car operates smoothly.
Choose Maclane’s Automotive
Your shaking car or truck and a flashing check engine light are indications of a misfire. This must be sorted out immediately, or else you could end up in big trouble. For any check engine light issues and car shaking, please contact us on (484) 321-8137, so that we can arrange for a diagnosis at Maclane’s Automotive in Malvern, PA.
