Question about Cars & Trucks
Posted by Anonymous on
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
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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Posted on Jan 02, 2017
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