Q: Intermittent flashing Check Engine Light

asked by on

the check engine light is not on all the time, when it comes on its starts to flash on and off -- which only happens when it acts like it is not getting enough gas....I think its the fuel pump as it does not always to it. Please help

The Check Engine Light is flashing on and off signifies a serious fault, such as the engine misfiring, which could result in unburned fuel being dumped into the catalytic converter thus overheating the converter.

Your circumstance will require a Check Engine Light diagnostic to determine if the problem is the fuel system or ignition system related or both. A common cause is a faulty plug, plug wire, or coil. You can get an engine misfire if there is corrosion on the spark wire metal terminal where it’s plugged into the coil or at the distributor cap when the weather is wet. If an injector is sticking or the fuel pump pressure is too low, then the engine will misfire as well. Often, it is a limited issue and thus economical to repair so it is well-worth getting it checked out and repaired promptly. If an issue like this festers, it has the potential to damage other costly parts such as the catalytic converter. If you would like to have a clear diagnostic of the Check Engine code, a certified professional, like one from YourMechanic, can come to your car’s location to perform this.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Intermittent flashing Check Engine Light

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: P101 keeps coming on Yukon 2003 after replacing with a new one, cat converters were installed fixing the p420 problem,

Claimed by Jay Safford

Q: Car has trouble starting with the a quarter of gas left

Hello. There is usually a tray inside the fuel tank located under the fuel pump. This is used to get fuel to the pump when the gas is low or if the car is on an incline. This tray could...

Q: Blown gasket

The smell of gasoline in the coolant is a sure sign of an internal engine problem. It may be a bad head gasket or even a crack in the engine. This engine in particular is known for head gasket failures....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...