Skip the auto shop - Our mechanics make house calls

Q: How do I know the difference between a broken engine mount and an ignition coil that is shot?

asked by on

I have had three of the four ignition coils replaced. I notice engine knocking that seems to subside after the car warms up. Perhaps this might be resolved with another oil change, synthetic of course. But there is a shimmy at times. The car doesn't seem to have much pick up. How do I know what could be wrong so I don't get ripped off? Wouldn't the engine shake if it wasn't running on all four cylinders? There is no check engine light but it has stalled upon starting twice in the last few days and today felt like it was about to stall while I was stuck in traffic. I shifted into neutral and it idled fine. Once I was moving again, the car ran normal. I use only BP gas but even that could need a can of dry gas. I work with kids with autism and depend on a reliable vehicle. Please tell me what you think could be wrong so I don't get ripped off when I get the car fixed. I am sincerely hoping an oil change and a can of dry gas might be all I need. I need to be prepared for worse case. Thank

My car has 13409 miles.
My car has an automatic transmission.

Usually when the engine is vibrating while the vehicle is in a forward gear, it’s a good indicator that the motor mounts or bushings are damaged. However, over time, the throttle body on your vehicle might be clogged with excess carbon buildup, which can also produce the same symptoms. The best way to determine for sure which one is causing your issue, is to have a professional mechanic complete a vehicle is vibrating inspection. During this service, they’ll download any error codes that might indicate fuel related issues before checking the condition of the motor mounts. Hopefully this info will help you determine your issue. And thank you for working with kids with autism!

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
  • How do I know the difference between a broken engine mount and an ignition coil that is shot?

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: My car's Check Engine Light came on. The code is for engine knock sensor 1. Does this mean it is bad?

If your Check Engine Light came on for the knock sensor circuit then it is likely that there is an issue with the sensor. Knock sensors are designed to help protect the engine against detonation, commonly referred to as ping...

Q: Car makes knocking sound

A valve train issue usually sounds more like a tapping sound similar to a pencil tapping quickly on a desk. Depending on the engine, a vehicle with a 4 cylinder engine can have as many as 16 valves. If several...

Q: Engine knocking while running uphill, and while idling

It sounds like you may have spun a bearing in the engine on the crankshaft or piston rod bearing. Depending on the cause you may have: lost oil pressure going up the hill from the oil pump sucking up...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...