Best Answer

A experienced ear can usually identify the type of problem just by the sound.

To Narrow down the location try:
  • Shorting Each cylinder so it does not fire, if the knock goes away or substantially reduces for one you have narrowed you search to one cylinder.
  • Use a mechanics stethoscope, this will localise the noise and lead you to valves, bottom end, piston or timing system
  • If this is a Common Rail injected unit a computer scanner to shut off injectors will help.
User Avatar

Wiki User

11y ago
This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: How do you identify the knoCking sound of a motor vehicle?
Write your answer...
Still have questions?
magnify glass
Related questions

Why does my motor have a knock when you rev the motor up?

because its either cold and not warmed up or you lifters are knocking but the would be a louder knocking sound

What would cause a loud knocking sound and scratching sound in the 3.1L chev Lumina motor?

it was meeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee

What causes a knocking sound in engine?

Mine did the same, mine was a motor mount.

What is the cause of the knocking if tie rod change?

Perhaps a worn CV joint (usually more of a clicking sound when turning), but there are many components in the front end of a motor vehicle that could cause a knocking (or similar) sound, including suspension components, brakes, steering components and bearings. Worn tie rods, by the way, do not normally cause a knocking sound, but result in very loose feeling steering and noticeable drift, especially at highway speeds. A knocking sound is more likely to be an engine problem, such as pre-ignition. If you are not accustomed to diagnosing these sounds, you will best best off to see a qualified mechanic, or a friend who is more familiar with the front-end components of a motor vehicle.

What causes a knocking sound on 1983 VT500C motorcycle?

Possible cam chain tensioner has broke.these tensioners are none adjustable and sometimes brake causing a knocking sound in the motor

Why would an 89 cad deville make a knocking sound when its off and parked?

Most likely your motor is low on oil and is knocking from being over heated.

A 2000 geo metro is making a knocking sound in motor like a rod but it is't?

Valve train

What is the knocking popping sound we hear when turning taking off and bumps?

I had a popping/rolling sound whenever I would take off or slow down in my '04 pacifica. I took it to a dealer and they said my motor mount was cracked in 2 places sending a vibration throughout the frame of the vehicle. Replaced the motor mount and the popping.rolling sound has gone away.

Why would a 1992 Pontiac Bonneville SSEi have single knock sound from the back bottom of the motor after the engine rev comes back to idle?

I read that bad motor mounts can cause this knocking sound

Why is there a knocking sound when blower motor is on in 04 cavalier?

Sounds like there may be trash in there..drop the blower motor out,get the debris out, put it back in...simple job...

Car makes loud knocking sound at high speeds?

A loud knocking noise in the motor of a car at high speeds is most likely the engine. There could be another issue with the transmission if the knocking only happens at high speeds.

I got a truck and it makes a knocking sound in the motor do you think it can be fixed?

it all depends on the loudness and where the sound is coming from, it can range from a loose bolt to bad connecting rod bearings