Had been facing some reduced low end performance recently, car seems less responsive to throttle inputs in low rpm. So, during my routine service yesterday it was discovered that my Adjuster Unit is not functioning well.
An adjuster unit's function is to vary the length of the intake runners.
At low rpm (4.1k), the flap opens to allow air into the shorter runners, helping volume efficiency and high speed power.
So Ah meng ordered one and had it changed.
Immediatley my low end torque returned. Car feels so much more 'lusty' in the low revs, like a bridegroom on his first wedding night! The new adjuster unit allowed the torque to feel so strong, so thick slurpy, and so lasting, all the way to higher rpm. I was having so much fun driving and using this rediscovered torque. Really nice.
So, if your car has similar symptoms such as reduced low end torque, or some vibration in idling (especially morning), your adjuster unit may be due for change.
This is how it looks like:
(This is just a sample image, as i forgot to take picture while they were changing mine). Think the below is M52 engine but the placement is same as M54 in the E46 325i.
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