Skip the auto shop - Our mechanics make house calls

Q: My car is shaking.

asked by on

The problem started yesterday morning on my way to work. The "engine service soon" turned on and my car started to shake and was driving extra slow. I just got the car not even a month ago so idk why it's misfiring already. I went to a local auto shop to ask questions and they told me that I have to get the coil changed and if I don't do it soon it will miss up my engine.

My car has 122947 miles.
My car has an automatic transmission.

A: Hello. the Diagnostic Trouble Codes would h...

Hello. the Diagnostic Trouble Codes would have to be retrieved to begin the diagnosis. Unless the shop retrieved all codes and performed a diagnosis and tested the coils (there are six of them on your engine), what they have told you is pure speculation. Although a coil defect can cause a misfire, there are quite a few causes elsewhere in the ignition and fuel system.

As far as the consequences though, they are giving you very good advice and actually engine damage is just the beginning of the concerns if the engine is misfiring. If the misfire(s) result in unburned (raw) gas entering the catalytic converter, you can destroy the catalyst in very short order.

I would be ashamed to find out that your only issue is caused by a mere faulty spark plug wire (not that costly) but you continue to drive the car causing hundreds of dollars of damage to the catalytic converters (converters are not repairable; the factory OEM converter on your car could easily be $500).

If I were you, I would not drive the car if it is actively misfiring. A mechanic of your choice or YourMechanic, if in your city, could quickly diagnose your Check Engine Light and get it repaired and reduce the chance of further damage. Unfortunately, engine misfires in modern vehicles are not as inconsequential as those that might have occurred in older vehicles prior to the 1970’s.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Where is the starter on a 2009 Jeep Patriot

On your car, the starter is below the air cleaner box and air tube. You have to remove those, as well as other components to access the starter. Once you have accessed the connections to the starter, test for power...

Q: Headlight not working properly

Your problem is most likely the ballast for the bulb. The headlight assembly has to be removed to replace it. There is always the possibility of a wiring issue. If you're not up to the task, a qualified mechanic from...

Q: My car won't start. Why?

Hello. A no start condition can be caused by a few different things. If your vehicle is having issues cranking then it may be possible that there is a problem with the battery. A low or bad battery can cause...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.