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Re: e300 merc vibrating noise from under right side of...
You are luckey it happen at idel. Open the hood and put your hand on various sheetmetal and plastic parts until the noise goes away. When you determine the piece at fault, see if some screws are missing or if it can be repositioned to avaoid the noise. Does not sound serious.
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If the noise gets worse making a right turn, then goes away or close on a left turn. It is a wheel bearing. If it an engine mount. Put a jack under it and lift the engine slightly. If the vibration goes away. I suggest you replace all the other mounts.
When you are in gear at idle with your foot on the clutch you have placed an axial load on the crank which is pushed forward in the main bearings against a thrust bearing. I suspect a failing thrust face on this bearing as it only works under a clutch release load. The only other point that is under load is the clutch throw out bearing but if that is failing you should be hearing a tinny type of rattle when you have the foot on the clutch
No the idle issue is not the TPS, it is a sludged up throttle valve and automatic idle speed control air bypass valve. The procedure below should cure the idle issue. As far as the vibration goes this needs a hands on diagnosis by a good noise and harness trained tech, tire shops are good for this technican as well of course the Dodge dealer. Find below the cleaning procedure for the throttle valve and idle valve Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional
The engine has some cushions (don't know the right name), every car has 4 or 6 of this cushions (2 under the front and 2 under the back of the engine and 2 under the gear box), its consisted by a screw and rubber and causes trepidation and noise.
Sounds like it is missing badly and would not be so noticeable when running. Have you had it tuned up lately? Could be wires and plugs need replacing. Also if you have a lot of miles on the engine the compression in the cylinders may be low. Two possibilities.
Check to make sure both headlights are tight,,,when it rattles at idle go feel the headlight and hold it and see if the noise and vibration goes away,sometimes the headlight has too much clearance and causes a massive vibration,,if thats not it try...loosening all the motor mounts and rock the car back and forth and them retighten them,it reseetles the mounts and sometimes fixes the issue,,also check the lower engine and trans mounts for wear.