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Re: Engine rattle when cold, sounds a bit like lifter...
Start with fresh oil change and filter. Make sure you are using the correct manufacture recommended oil wt. and rating. The counter person at the part show should know what to give you.
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A tapping noise that starts out cold and goes away when warm is usually caused by a valve lifter inside the engine. The lifter may be worn/leaking down and will be noisy until it fills with oil pressure. You can try an oil additive ( Lucas Oil Additive ) available at most part stores works very well with noisy lifters. Another noise that can happen cold and go away when warm is an exhaust manifold leak. However, this is normally a ticking type sound rather than a tapping sound.
The 3.4L engine has special pistons that are designed to expand as the engine heats up. When the engine is cold, the pistons make a knocking sound that resembles lifter noise or piston slap. As long as the noise goes away after the engine warms up, don't sweat it; this is normal.
it is possibly piston slap,which is normal,some car company like GM also use slightly bigger gap between piston and cylinder on (3.1,3.4,3.8 liter engines) to help engine last longer,in return you get some piston slap when ENG cold,if it goes away after it warms up don't worry,it is normal
when oil is cold it is thicker and stays [on]coats metal as oil warms up it thins out and flows better[makes it thinner will hear ticking] sounds like a bad lifter or even camshaft lobe problem ,could also have a problem with a loose or out of adjustment rocker arm
This could be many sounds. First off it could be the sound of an injector or it could be the sound of the lifters rattling a little until warmed. Usually though the lifter sound comes after the engine has warmed up. Have you had the oil changed at regular intervals? Maybe try some better gas if your not using premium and the car calls for it? Check your owners manuel for this.
Sounds like a hydralic lifter issue.
These lifters operate the cylinder valves and run off oil pressure. When the engine is cold and the oil is thick worn lifters tend to rattle. When the engine warms up, everything expands and the lifters stop rattling.
There is no easy cure for this except replacing the lifters.
Sorry....
Take a broom handle(with the broom removed) or long heavy dowel rod , start the engine when cold and place one end of handle to your ear and the other to different parts non-moving parts of the engine compartment,including the engine to narrow down the location of the noise.
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