Question about 2000 KTM MXC 250

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Low down knock from right side bottom of engine

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Could be big end or main bearing or even the crank could be bent.

Posted on Mar 07, 2010

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Posted on Jan 02, 2017

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Why is my engine making a knocking noise, could I possibly get a list of things that cause knocking? It's a 1995 Buick century special, four cylinder.


Many things could be the cause. Common ones are:

  1. Low oil level.
  2. Low oil pressure due to worn out oil pump.
  3. Connecting rod knock (part of piston assembly)
  4. "Piston Slap" - this occurs when the cylinder wall gets worn into a cone shape, wider at the base from the side-to-side motion of the piston over millions of cycles. The wear gets to the point where the piston skirt (bottom edge) hits the side of the cylinder wall as it hits the bottom of the stroke and begins moving upward. Eventually the skirt will break off and the engine will need rebuilding or overhaul.
  5. You could also have a simple valve tap, as you are not really defining knock, although valves usually are more of a ticking noise rather than a knock.
  6. If the knocking only occurs on acceleration, you could have what is known as "octane ping" from fuel that is too low in octane. Not likely with a four cylinder, but some really cheap gas grades are occasionally guilty of being less than advertised for octane.
  7. There are even a few transmission issues that can cause knocking, so make sure you narrow down the issues before diving in too deep.
Hope that helps!

Sep 16, 2015 | Buick Cars & Trucks

1 Answer

2005 kia optima lx v6 engine started knocking on right side of motor heater wouldnt work earlier that morning


check for low coolant, look for coolant bubbling up in over flow bottle
if there is call a mechcanic

Mar 27, 2014 | 2005 Kia Optima

1 Answer

Engine knocking


Well a low tone knocking noise at startup is usually a worn engine bearing.
You should be able to have someone listen to the engine to tell if it is coming from the top or bottom.

Feb 01, 2014 | 2000 Dodge Grand Caravan

2 Answers

Where is the knock cylinder located on a 1990 chevy c1500 V8


It is located in the side of the engine block on the passenger side of engine down low, it screws into the water jacket so be prepared to get wet.

Jan 30, 2011 | 1990 Chevrolet C1500

1 Answer

Heard a knick-knack sound and then the engine shut


knock sensor is working at least right but unfortuanantly thats all that is working

it is likely a knock isue check the motor oil it is not un usual for a nisan to knock when the oil is low but on rare ocation it will kick so hard the knock sensor will activate

Mar 23, 2010 | 1994 Nissan Quest

1 Answer

2000 Audi a4 qauttro Knock Sensor 2 Circuit Low Input (Bank 2) Where is it located please help.


The knock sensors are mounted down low on either side of the engine block, and are not very easy to reeach/remove.

Sep 19, 2009 | 2000 Audi A4

1 Answer

My engine is knocking and missing


I think you have run the oil down low or have had a blockage in the oil gallery to the crankshaft.Resulting in the bottom end bearings wearing out.Drain the oil and check for metal particals.good luck!!

Jul 06, 2009 | 2001 Mazda Protege

2 Answers

Engine knocking.


Hi,my 92 prado started making a knocking sound recently,we couldn't pin it down to one spot in the engine.
The knocking was constant at low revs and then disapeared.
Turned out to be the tourque converter knob had bust of and eventually destroyed the fly wheel and the transmission pump.
Definatley check under top cover and also drop off the sump to check for loose nuts etc.
hope this helps.

Dec 27, 2008 | 1992 Toyota Land Cruiser

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