Hi i have a slight rattle from engine but no loss of power

Is the oil level and oil pressure ok, it sounds like you have no oil pressure, if it rattles it is to late you have damaged the engine bearings.

"Rattling" is normally due to one of two things:

1. On heavy acceleration, rattling is usually due to low octane fuel.
2. If at all times, it can be due to low oil pressure.
   
   Rattling can also occur if the engine timing is way out specs. This will normally be accompanied by a substantial loss of power on acceleration.

is the 2.0 or 2.5? check timing idler pully (upper) fails frequently on 2.5, also check for arcing in the sparkplug tube. #3 on 2.0 (most common) # 5 [first] # 2 [second (toward firewall)] on 2.5 {most common} my 2.5 had spark plug tube arcing on #5, could barely pull a hill in 5th. idled like badly and had slight knocking/rattling sounds. replaced that wire, had a spare from old set, now pulls hills in 5th at 80mph

Correct oil used. Level ok? Correct filter? Any lights on dash?

Billy you have the main bearings on the crankshaft, but you said a rattling noise, these pulleys are bolted to the harmonic balancer check the bolts that attach the pulley to the balancer to see if they are tight. Sometimes they can work their way loose. If it were a main bearing the engine would have a slight shake to it or in other words while the vehicle is idling the motor would shake along with a loss of oil pressure on your gauge in the vehicle. By the rattling it can be two things that come to mind either the harmonic balancer is coming apart or the pulley is coming loose from the balance. Hope this helps let me know what you find.

hi this could be the hydraulic tappet's they might be warn or the oil is now thin and needs changing, if the rattle is coming from the top that is, hope this helps

its common,dont worry about it,if it happens in more than first gear and gets worse then you have a problem

Sounds like you may have lost oil pressure. Could have engine damage, Have you had a service center perform a diagnosis’?

Check your converter on your exhaust when it's running and see if the noise of rattling is coming from there.If it is you have a plugged converter,it's broken up and in piece's which will make noise and no power especially when calling for power.Be sure to let exhaust cool before repair is done.If the engine is making the noise like a knocking sound you should bring it to have it checked.Hope this help's.