Skip the auto shop - Our mechanics make house calls

Q: nocking in head , speed up it get louder, it not rod bearing , not on top of head, oil lite mat be on

asked by on

the noise is ? sound like piston valve but not, rocker fell off but lower more gas more knock kid said it will die no idel

My car has 122 miles.
My car has an automatic transmission.

A: Hi there: Most of the time, engine knockin...

Hi there:

Most of the time, engine knocking coming from the valve train is caused by one of two things. First, and most common is low oil pressure or low oil levels which can be caused by a damaged oil pump, obstructions in the oil galley (like sludge) or simply being low on oil. Second is if the push rods or valve hardware are loose it will expand the valve clearance (lash) between the rocker and valve; which can create a knocking sound. Either one will increase speed as engine RPM increases. The best way to know for certain is to have a professional mobile mechanic complete an engine is making a noise inspection.

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: Power steering doesn't working

Hi there. A common issue many owners of your particular vehicle face is the power steering quitting on them. Usually, it is accompanied by an alert on the Prius' multi function display. Commonly, the power steering module will be the...

Q: Locking mechanism not working properly.

The drivers door lock actuator may be the cause of the problem. Inside the lock actuator has two rubber stops when it goes from lock to unlock and sometimes the rubber falls off and the actuator will not stop cycling....

Q: I am looking for a sunroof

Hi there: Unfortunately, the replacement sunroof business for vehicle's 20 years old is not as open as most auto part replacement items. Your best bet is to search locally on Ebay.com if you're in the United States, or through local...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...