Skip the auto shop - Our mechanics make house calls

Q: Car vibrates when accelerating. Replaced engine mounts, coils, and plugs.

asked by on

Whenever I depress the gas pedal more than a quarter of the way the car vibrates pretty badly. Thought it may be the transmission, but the transmission shop found misfires. I had already replaced the coils, plugs, and bad engine mounts. Any ideas?

My car has 172000 miles.
My car has an automatic transmission.

It sounds like you’ve covered the basics. Did the transmission shop check the fluids in the transmission and differentials? Very dirty fluid may contain metal shavings that cause the drivetrain to bind under load. It is not unusual to find faulty components in new boxes from parts stores. You may want to take the vehicle back to the shop that you had your last service to check the work. If you need a second opinion, a certified professional from YourMechanic can come to your car’s location to diagnose the vibration problem and help proceed with repairs with appropriate repairs.

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!
  • Home
  • Questions
  • Car vibrates when accelerating. Replaced engine mounts, coils, and plugs.

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: Key won't turn in ignition

Hi. These vehicles are well known for having problems with the ignition lock cylinder and key. Both have a tendency to wear out, which will prevent the key from turning. There is the off chance, however, that the steering wheel...

Q: Cylinder 2 misfiring not firing at all

It sounds like the spark plug tube seal for the number 2 cylinder has failed. Then a spark plug tube seal fails, this will allow oil to reach the spark plug. No matter if the spark plug or ignition coil...

Q: Transmission shifting issue

Hello. If the transmission is on the vehicle it has to be diagnosed. Although there are a lot of parts in a transmission, conceptually it is actually pretty simply. There are electronic control circuits, electrically actuated solenoids, and hydraulically actuated...

Related articles

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...
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.