Skip the auto shop - Our mechanics make house calls

Q: Been hearing a knocking noise when i hit the breakes and this morning it wont start

asked by on

So i was told that i have a bad engine mount and i changed two of them. The Vibration went down but i still could hear a knocking noise from the right side of the car. This morning i tried starting it and it cranked but wouldnt start
My car has an automatic transmission.

A: The first thing to check is to see if the a...

The first thing to check is to see if the anti-theft light is on when you are trying to crank the car. If it is, then try and have someone give you a jump start to raise the battery voltage when cranking the engine. If the vehicle starts, then replace the battery. When the battery gets a little bit low on power, the vehicle may seem to crank okay, but the voltage will drop below the anti-theft system’s needed minimum and disable the ignition.

As far as the knocking noise, I would check with the local dealer to see if your vehicle is under a recall for the front suspension. The knocking may be from the strut mounts on top of the struts. If you’d like help getting this looked at in person, a certified mechanic from YourMechanic can come to your home or office to diagnose the starting issue and knocking noise.

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: I cannot find the torque specific to add a strut bar in foot pounds

The "correct" amount of torque applied to a fastener depends on many factors including the desired clamp load, the strength of the bolts you are using and the condition of the bolt threads including the type of plating thereon and...

Q: how do I replace a thermostat on a Nissan Maxima?

The thermostat is located on the front of the engine. The engine is mounted transversely so the front of the engine will be facing the passenger side and the thermostat in near the alternator. The battery must be disconnected and...

Q: How do I quickly defrost the windshield?

If you need to defrost the windshield in a hurry, you can do so. Simply turn the Air Flow Control dial to Defroster, turn the Fan Speed Control dial to maximum, and turn the Temperature Control dial to hot. When...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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.