Skip the auto shop - Our mechanics make house calls

Q: Blinking Check Engine Light, issues with rpm, possible spark plug issue?

asked by on

Recently, while I am driving, my check engine light will start blinking and my rpm will go up and down when it shouldn't. I've looked up some things and I keep getting results for misfiring cylinders and possible spark plugs issues. When it starts acting up, I usually smell somewhat of a gas smell, not sure if that's related.

My car has 160000 miles.
My car has an automatic transmission.

Hey there. The gas smell you experience is most likely due to the unburned fuel due to the engine misfiring. Since you smell unburned fuel, the cause is most likely spark-related. If any spark plug is not firing correctly, the spark plugs themselves can be at fault or they can be the effect.

If an ignition coil is not firing the spark plug, then the bad coil is the cause and the misfiring plug is the effect. Also, the ignition coil may not be firing properly due to the coil itself being shorted or possible receiving a poor signal from the engine control unit.

You should have a certified technician look into the Check Engine Light as soon as possible. Continued driving with the light flashing can cause internal engine damage if not corrected.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 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
  • Home
  • Questions
  • Blinking Check Engine Light, issues with rpm, possible spark plug issue?

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: Turbo damage in 1.2 TSI

Claimed by David Gaines Wooten

Q: Check engine light illuminted

Depending on the code received, you could either have separate problem or the O2 sensor code returned due to a misdiagnosis. The codes for O2 sensors can be from the engine running lean, rich, misfiring, or several other reasons. However,...

Q: My truck won't start, battery is good, alternator is good, don't know if its starter, was told might have to change neutral lock.

You will need to test the small yellow wire with a blue stripe that goes to the starter and powers it when the ignition switch is turned to start. If the the wire checks out with power then the problem...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.