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Loud knocking sound when giving gas or changing gears. Oil is fine.

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  • Master
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Depends on what kind of car .. if its a subaru then thats the only car i know of where it is normal .. usually using a heavier weight oil or synthetic 10w40 or so seem to quiet that down .. the noise in that case is caused by piston slap because of no skirts on the pistons (green "improvement)" .. on any other car worry ... in general here are things to test .. a rod bearing bad will rattle as you gently accelerate or let off slightly .. they ususally quiet down when pulling or idling ... a main bearing will have a lower pitch (like thud thud ..) and makes the most noise when accelerating , usually quiets down when not accelerating .. piston slap and wrist pin problems show up with slight acceleration ... on some cars a heat riser valve can become noisly but its unusual to be loud .. an irregular rattle when accelerating could be preignition (spark knock) .. that could be caused by using fuel with too low an octane rating or ignition advanced too far .. but most modern cars compensate for this.... at least these are things that should be checked out soon .. if a rod bold has come loose or broken, then it will rattle for awhile then really mess things up when the rod cap finally breaks .. it costs a lot less to fix before it fails completely.. make sure your oil pressure indicator is actually working .. if its a light then it should light up when the key is first turned on before the engine is started .. a pressure test can be done to make sure .. .

Posted on Jul 04, 2010

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  • Cars & Trucks Master
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The oil pump may be wearing out. The bearings in the engine could be allowing too much oil to pass through, and cause a low oil pressure around the other parts, including the camshaft or main bearings.

Posted on Jul 04, 2010

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2 Answers

Motor sounds like a bunch of Indians trying to get out.


sounds to me like you could have damaged the oil pump, running low on oil can cause numerous things to fail.. possibly spun the rod bearings and they are beating on the crank. I wouldn't start it, but if the noise is in the bottom I would drop the oil pan.

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Hi Janay, It would not take a good mechanic more than lifting the hood and listening to the engine to determine that the engine had knocked. By all means have someone else have a listen and a look and wait to hear the diagnosis they give. It's always a good idea to have a vehicle serviced on a regular basis. If you needed to add oil, to have the sound of the engine change, It sounds like you didn't bother? If the engine knocks more when you apply gas it seems to me that the connecting rod bearings and the small end bearing have both been damaged by the lack of lubricant (Engine oil). If you like the vehicle replace the engine, if not replace the vehicle. Regards John

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Hello, With so little information, I would HAVE to assume that this is a rod knock. Does it make noise in neutral too? Or only when you drive it. Try to put it in neutral and step on the gas....Does it still knock? A rod knock means you need to rebuild that motor. A rod knock can usually happen from beating on the car or a timing belt slipped a couple of gears. I would check your engine oil level, not transmission. Because low levels of engine oil can create this sound too. Good luck and feel free to write me back with much more detail so that I can further assist you.

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If the knocking is a 'tinging' sound...valves are shot. The Paseo has an issue with the head getting warped and leaking oil through the gasket, if the oil has been low too often for lengths of time the head heats and warps.
Open the oil cap and feel around inside with your finger (ensure engine is off and cooled first) rub your fingers together to feel for grit which would most likely be valve shavings. This should be easy to find since it's recently had an oil change.
Worse case scenario would be a rod broken but that would be a LOUD knocking/bonking sound and definitely expensive.

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Well, not too many things can make a knocking sound from the engine. Unfortunatly, I would say that it sounds like you have a bad push rod. Did you buy the car new or used. It could have been a problem before you bought it(if it was a used car). There are ways to temp. stop the noise so that someone buying the car won't know there is a problem until later. I would like to know more about the situation so that I can thourghly help you find and fix this problem.

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