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I noticed the following problem:
There's a noise coming from the engine bay (possibly the engine?) when I accelerate hard while making a left turn.
My car is a 2007 Jaguar S-Type, with rear traction and automatic transmission. The noise is not present on right turns, only on left ones.
Also the noise is only present when I accelerate (at least 50%), if I let the acceleration pedal there's no noise anymore.
What could it be? What should I check first?
One strong possibility is you have something loose which is rubbing against a tire. It could be a piece garbage you ran over which got caught, a loose cable or hose which moves under acceleration or maybe a piece of loose body trim. A visual inspection of the engine bay and wheel wells in the front is a start, it may be pretty obvious. Check for grooves or damage on a tire sidewall as that is a giveaway. Wiggle things around, and if you find the culprit secure it.
If something has been rubbing on a tire check it thoroughly, rubbing can weaken sidewalls and cause tire failure.
From you comments, we can summarise that:
A "wub wub" or grumbling noise can sometimes be a wheel bearing, and this is easy to check. If you jack the car up so the front right wheel is in the air, hold the wheel and tyre at 12 O'Clock and 6 O'Clock. Then try to push it in at the top and pull out at the bottom and visa versa. This should be solid, however if there's significant movement then you have a bad bearing, or something is up with the hub.
As you say you have some bad bushings up front, these could be the rattle / grinding noise. Remember their job is to allow movement of the wishbones to the chassis and if worn will allow the wishbone to move too much, and potentially rub into some chassis or bodywork. I've had a car where under heavy breaking the steering wheel felt like it was going to fall off it moved so much! All down to a pair of wishbone bushes.
Also, remember that whilst you can push and pull, and think there's no lose body work etc... At 100 kmph, with 1.6 ton of metal pushing things around, there's a lot more weight and movement than you may think!
I'd first check for the wheel bearing, followed by the front bushes, the ARB bushes, and any play in the steering rack.
