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There is a knocking sound coming from the engine

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Has the engine enought oil?
is the engine missing?
does the exaust noise sound ok? and all cylinders a running?

Posted on Nov 26, 2014

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Posted on Jan 02, 2017

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1 Answer

Sound inside the engine


Does the knocking sound increase with engine speed? Check all the things run by the belts, like A/C, alternator, etc. by removing the belts and starting the engine. If there is no more knocking, then check those components. If the knocking is still, you may have an internal engine problem like main or rod bearing failures. Check the engine oil for any metal flakes.

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Ing sound coming from left handside of xsaara picasso


If the knocking sounds like thudding or something dull is knocking on the car, remove the left front wheel and check the drive shaft boot. It could have been torn and parts of it is hitting the lower arm. If it comes from the engine, check the engine mounts, all 3 of them.

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What is engine knock and what causes it?


Engine knock is the state when crankshaft bearings are no longer the specified diameter and that is characterised by a knocking sound coming from the engine, hence the term "engine knock". It is caused by bearing wear. Bearings wear with time but wear is accelerated by using bad oil or running engine without o

Aug 09, 2013 | Cars & Trucks

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sounds like connecting rod bearings i wouldnt suggest fixing it

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1 Answer

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I agree it sounds like a rod knocking but don't worry it want knock long!
Gillight

Jul 22, 2012 | Cars & Trucks

1 Answer

NOISE WHEN COLD THEN GOES AWAY WHEN WARMS UP,SOMEONE SAID MAIN BEARINGS GOING BAD


Hard to say over the internet but I will try to explain. If the noise is a distict KNOCK KNOCK and it sounds like it is coming from the bottom of the engine, then it most likely is a rod or main bearing. If it is a TAP TAP noise that sounds like it's coming from the top of the engine, then most likely a valve lifer is failing/failed.
the fact that it goes away when the car is warm, makes me lean towards a bad lifter. Normaly if a bearing is bad and knocking, the noise doesn't go away.

The KNOCK noise will be somewhat hollow sounding and the TAP TAP sound will be more solid. If the KNOCK KNOCK is solid, then a rod or main bearing has most likely failed to the point that a new/reman engine will be needed.

Jun 14, 2011 | 1994 Pontiac Grand Prix

1 Answer

I have a 2004 Ford Explorer with a knocking sound coming from the engine. Was told I could be the timing chain. But it's not. What else could be making a loud knocking sound? Thanks.


If your truck has the 4.6 or 5.4 V8 then you know it has two timing chains. The lifters could be causing the knocking noise. If it sounds like it's coming from the top then I would suspect lifters. If it sounds like it's coming from the bottom of the engine then I would suspect main or rod bearings.

Mar 29, 2011 | 2004 Ford Explorer

1 Answer

ENGINE KNOCKS


When you say engine knocks ..what type of knocks//where does the knocks come from top of engine like atapping/ knocking from the bottom of engine a harsh knock/ does it sound like it comes with 1 piston up on TDC or BDC or more than one knock per 1 RPM /AND whats the condition of the oil at the moment / and what engine have you got in it.
Let me know how you get on ASAP Ron

Nov 04, 2009 | 2000 Ford Expedition

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