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post #1 of (permalink) Old 02-13-2019, 04:03 PM Thread Starter
BenzWorld Member
Date registered: Jan 2018
Vehicle: '04 S500 4Matic
Location: Toronto, Canada
Posts: 303
Mentioned: 4 Post(s)
Quoted: 44 Post(s)
(Thread Starter)
Slight idle vibration (intermittent)

Hi Everyone

Ever since I bought the car a year ago, I have had an issue with an intermittent vibration. Sometimes it's when the engine is cold (I can feel it through the seat, and the door shakes if it's open - this is even in Park). Sometimes it's when the engine is warm at a stop light. Shifting from D to N seems to reduce it a bit. Sometimes it doesn't happen at all for days at a time. It doesn't correlate to engine or ambient temperature.

Initially I was going to replace the engine and trans mounts but the mechanic says they look fine and are fairly new. Also, with it being intermittent, I didn't think it could be the mounts. If they were bad I would expect it to be more constant.

On Friday I am replacing the spark plugs, spark plug wires, air filter and I am also getting the mass air flow sensor and throttle body cleaned.

I was wondering if anyone can think of any other maintenance activities to do while I am at it? I have a new CPS that I keep in the trunk just in case but I wasn't sure if I should fit this until I need to. I have SDS and there are no errors or codes. I am hoping that it's an issue with the plugs or wires that isn't serious enough to generate a code, but is serious enough for me to feel it.


(2004 S500 4Matic, 190,000Km, Toronto, Canada)
oliverp is offline  

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