Engine has hydraulic lifters. 1. Seals are wearing and oil is draining out while sitting. 2. oil is dirty and needs changed. 3. oil is low. 4. engine has sludge build up. Try "pass or don't pay" engine cleaner for smog test additive and follow cleaner directions.
SOURCE: 4.7 liter jeep motor making tappinf sound and motor is missing
sounds like the lifters losed prime! here is a little trick that ive learned add a half off quirt off transmission fluid to the oil to prime the lifter
SOURCE: Loud tapping noise from 2005 grand prix 3800 engine
It could be you are low on oil;using the wrong oil;a possible loose connecting rod,or,maybe a bad or stuck lifter.
Neil
SOURCE: ENGINE MAKES NOISE,SHAKES
The engine is probably misfiring. You can verify if the engine is misfiring unplugging one spark plug cable at the time. If you have not done this before, better going to a mechanic and have the engine checked.
SOURCE: Engine make Knocking noise when cold
I have the same problem on my 2.0L 2001 Legacy auto. It began about 1000 miles ago. It has now done 84k. From my online searches this is most probably 'piston slap', and is not serious. To save weight Subaru shaved down the skirts on the pistons. With normal engine wear the pistons will at some point rattle against the cylinders until the engine is heated up and the pistons expand. The rattling should go away after a few minutes. If it persists say 10-15 minutes, it may be another problem.
SOURCE: hyundai tucson 2006 start overheating out of
Waterpump, seems like a likley culprit. Your Ac compressor belt runs over your water pump. when the ac is on it puts more load on your engine , your water pump may be defected and not able to handle the extra load.
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