Question about 2001 Chevrolet Impala

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Sounds like the valves or pistons is knocking loud, what can I do. One person that repair cars says it not the valves, something is lossened

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If it is a knocking noise, you could be hearing bearings or pistons.In either case it is internal. The engine would have to come out and be rebuilt. On something like this there is no easy fix or short cut that can be taken.

Posted on Oct 03, 2009

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Posted on Jan 02, 2017

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Why is my 2002 Mazda Tribute making a loud knocking noise when I start it


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Oct 07, 2016 | Mazda Cars & Trucks

1 Answer

What is causing loud knocking?


If you went off the road and the snow jammed into the engine compartment look for something bent and striking when the engine is on. If you find nothing bent or broken and the noise is coming from inside the engine you may have a bent valve or connecting rod. When an engine is abruptly stopped thing can get damaged. Take a wood shaft like a broom handle and place it near the bottom of the engine when running on the block and place you hand on the end of it and then place your ear on your hand and lesion for a knock. If in the bottom could be a bent connecting rod or also called a piston rod. If noise is in the top more likely and bent valve and the engine may run rough. If you not sure have a mechanic lesion to it. You can consult your repair manual for further test. Good luck.

Mar 06, 2016 | 2000 Chevrolet Blazer

1 Answer

Lost compression and now there is a loud knocking noise in my 454 vortec engine


Bent valves would be number one cause. Check the timing. If you lost time, your valves are tapping the pistons causing the knock. When the valves tap the pistons they bend and don't close all the way, so the cylinders cant make compression.

Oct 17, 2012 | Chevrolet Chevy Cars & Trucks

1 Answer

Loud knocking


Sort of sounds like the timing belt broke-- if you have one

The valves may have hit the pistons & that is why it won't turn over

I don't know any of that is true & won't wish it on anyone,but
it is a place to start

Sep 13, 2012 | 2001 Saab 9-3

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Loud knocking in engine with white smoke


Hi Tracey P, sounds like you have a TERMINAL problem! If this noise and smoke symptoms came on suddenly while driving, and your performance is impaired, then I would suggest you might well have lost one cylinder dur to component failure. That might be a piston breaking up, a valve dropping or perhaps a combination of the two. I would seriously suggest that it's time to remove the cylinder head/s to check what exactly the problem is.

Jun 11, 2012 | 2001 Ford Focus

4 Answers

My 2000 1.6 litre Corolla has a loud knocking from top of engine. Sounds like a valve dropped or seized and maybe hitting piston. The engine has been running well but suffering high oil consumption.


STOP RUNNING THE MOTOR IMMEDIATELY!!! If it has dropped a valve all you are doing is making the damage worse. Take the valve cover off and make sure all of the valve stems are there. If not replace or rebuild the motor.

Jun 27, 2010 | 2000 Toyota Corolla

1 Answer

Loud knocking noise from the engine the hotter the engine gets the louder


loud knocking is usually a piston problem[wrist pin-piston-piston rings -rod bent damaged-crank -bearing ]piston hitting valve pull plugs and check for fouling it will narrow down area do compression test but knock usually doesnt last long before engine usually goes south other which u can hope for and can sound like a knock would be the exhaust gasket good luck

Jun 10, 2010 | 1993 Buick LeSabre

1 Answer

Loud knocking oil in the spark plugs


Do a wet/dry compression test and determine if it's the piston rings or the valve seals.

Aug 12, 2009 | 1993 Honda Accord

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Loud engine knocking on 2001 Ford Focus


Sounds to me like a very common problem has occured to your neighbor. If this is a SOHC engine, one of the valve seats in the number 4 cylinder has fallen out. I'm sure it has damaged the head and the piston. Stop trying to run it or you might blow a hole in the cylinder wall or break a rod or both.

Jul 27, 2009 | 2001 Ford Focus

2 Answers

Engine was knocking loudly and then stopped


When the timing chain goes if the valves are fully open they won't clear the pistons (likely the loud thump you heard) when they come to TDC. Likely looking at a full blown valve job now, make sure it didn't crack or warp the heads in the process. With 192,000 miles on it it was probably due for one anyway. Easiest way is to pull the heads off the block and send them in for a machining and valve train replacement (about 4-$600.00 if you DIY.

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