Skip the auto shop - Our mechanics make house calls

Q: When I turn on my car I hear a knocking noice on it and when I accelerate it's worse.and won't go fast when I accelerate it don't

asked by on

When I turn on my car I hear a knocking noice and when I accelerate it's worse.and when I go it won't go fast..the noice sound like it's coming from under hood or by transmission
My car has a manual transmission.

A: If the noise is coming from the engine, the...

If the noise is coming from the engine, then it sounds like you may have bad piston connecting rod bearing. This would account for the noise getting worse and very low power. If the noise never goes away it could also be internal to the transmission or clutch assembly, though if it was from the transmission, then it would go away when sitting stationary with the clutch depressed. Before any mystery noise can be determined, I would suggest have a qualified technician, such as one from YourMechanic, come and diagnose the noise in person. This way you can get a thorough diagnosis and know exactly what repairs are needed.

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・Save up to 30%

Get a quote

What others are asking

Q: Where do you find the engine number and transmission number?

Both your car’s engine and transmission have unique identification numbers. While you won’t need this information for title purposes or to insure the car, you might need it for warranty claims or extended warranty work, so it pays to know...

Q: When I go to use fix-a-flat I can hear my tire deflating more

First of all, fix-a-flat is to be used as a backup to using a good spare tire. If you add the fix-a-flat to a leaking tire, you should follow the directions on the can to add the liquid to the...

Q: How do I play a CD?

To play a CD, you will first need to insert the CD. Insert the CD by slowly sticking it into the CD slot, face up. Do not force the CD in; it will feed itself in. When you insert a...

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...