Skip the auto shop - Our mechanics make house calls

Q: Engine shakes upon startup.

asked by on

When I start the car, the engine is shaky and loud.

A: I can be quite alarming to start your car a...

I can be quite alarming to start your car and have the engine start loudly shaking. There are a number of reasons why your Ford Focus is experiencing these symptoms. I have seen a number of shaky engines due to bad engine mounts. Engine mounts keep the engine firmly in place and reduce the vibrations in the car for a more comfortable ride. Another reason for shaky engines are engine misfires. If you are misfiring then your Focus may be due for a tune up. I have also seen shaky loud engines being caused by bad timing belts. When a timing belt is brittle and worn out, it will jump tooth, meaning it literally will grab the next tooth on the belt zipper. A timing belt jumping a tooth will change the timing of the engine and it will not run correctly. For all of these possibilities, it is best to enlist the help of a certified mechanic to inspect the shaking and get your Focus back to running great during start up.

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: Design and quality of modern cars

They can have as much as they want now. There are no if's, and's, or but's about it. I'll give you a story that goes back to my childhood. When I was a kid, my parents bought one of those...

Q: Camshaft sensor replacement

Hello. Depending on the shop doing the work would change what is replaced. Some shops will replace both but many will replace one. Knowing what the code was would help me to make sure that there are issues with both...

Q: Car shaking when turning sharply

Wheel bearing problems are usually indicated by noise and/or play. A bad wheel bearing will make a rotational grinding or growling noise that is proportional to vehicle speed. The bearing may also have play, allowing the wheel/tire to wobble. Wheel...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...