Metallic rattle during acceleration

Hi there,

The sound you hear, is it a whining, popping, grinding, scraping or rattling sound?
If you drive a manual transmission vehicle and notice a grinding noise, it can indicate the clutch gear is no longer disengaging correctly.

The rattle (noticed at times under hard acceleration) is the cause of gas shock on the upper part of the engine loosing charge, in-turn causing the engine mounts extra stress and thus metal vibrating/rattling together.
The knocking (over bumps, etc. if you have noted that) is caused by worn bushings, most likely worn sway bar end links (you will see the links looking at the undercarriage, on both sides, they are a little steel "bars" with threaded ends on a 90 deg angle held by bushings e.g. example of front sway bar links ).
I noticed these noises coming on (at various times) at about ~140,000km or ~67,000mi and drove the car as it was until ~300,000km when i sold it (as is). Annoying noises.... yes... did I turn up the radio and carry on driving this car, not "fixing" anything (and I mean not a single $ spent on it aside from maintenance) and then sell the car... yes. The choice is yours.

run the fault codes
no fault codes , check for loose mud flaps , trim , wheel trim etc

Hi there, the noise you might be referring to which sounds similar to a typewriter may be the cam gear for the VVT found at the intake. If it is louder than when you got this it may need check up. Changes in the O rings or may need replacement if you also notice a decrease in power at certain revs. Not all sounds however may not be the case. High pitch sounds may be because of timing belts or metal to metal contact which may need lubrication. As for valve lifters, the one that you have does not have any.

Idle is factory set and cannot be adjusted, your best bet is checking for cracked hose pipework for air intake at idle,(not at problem under exceleration and driving) Any slight upset to the air /fuel ratio will be most prevelent at idle speeds.Check hoses where the meet metal flanges on manifold intakes and any sharp bends in ppipes.Good luck

Unless you are hearing an exhaust rattle of some sort, suggest higher octane fuel or check your timing.

its a dirty injector

have youre transmission oil changed an ckecked for metal

ok you could try the cat converter on the exaust when the car is cold bang it with your hand its the first box on the exaust at the front nearest to the engine you will hear it rattle