Valve adjustment??
Thread Starter
Junior Member
Joined: May 2009
Posts: 72
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2005 E320 4matic wagon
Valve adjustment??
Recently noticed this sound becoming more frequent over the past few months. Hard to describe, sounds like hi pressure air escaping with a little tapping. Doesn't always follow engine RPM. At times it will stay constant, fading in & then out. Other times, it happens for a few seconds, then cuts out abruptly. It's heard more in the cabin, seemly in front and toward the left of you, not as much with window down. No exhaust smoke or oil level change on the stick. Getting good MPG, performance not affected adversely. Just a nagging sound? or valves need adjusting? Maybe manifold gasket? Got suggestions? Puzzled!
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Joined: Apr 2007
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300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
open the hood
start the engine.Listen at start up if you hear the tap tap tapping of the purge valve located on the drivers side above the wheel well.
Diy cleaning procedure on www.benzworld.org w210 forum
it is stamped MOT
Diy cleaning procedure on www.benzworld.org w210 forum
it is stamped MOT
MBWorld Fanatic!
Joined: Oct 2007
Posts: 1,564
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From: SoCal
98 Brilliant Silver E320 Wagon
While the sound you describe sounds like the purge valve as ohlord mentions, I'd be surprised if you could hear it while in the cabin with the motor running and the hood closed. I can only hear mine while standing next to the left side of the car with the hood open. And yes my hearing is still adequate.
There are some vacuum operated 'doors' in the heater case and maybe the sound could travel to the left air nozzle but that's all I can think of. Just my $0.02.
Good luck.
There are some vacuum operated 'doors' in the heater case and maybe the sound could travel to the left air nozzle but that's all I can think of. Just my $0.02.
Good luck.
Thread Starter
Junior Member
Joined: May 2009
Posts: 72
Likes: 0
2005 E320 4matic wagon
valve adjustment / MOT
Guys-
Thanks for the input a while back on this, re: valve adjustment thread.
What does the MOT do? Asking because I had a "check engine" light and dash message "check engine electronics" come on today. Coincidentally, right at 140K miles. Engine sounds the same, MOT taps the same. No obvious problems. Suggest replacing this MOT? Get a computer read and clear the codes? Looking for suggestions please.
Thanks for the input a while back on this, re: valve adjustment thread.
What does the MOT do? Asking because I had a "check engine" light and dash message "check engine electronics" come on today. Coincidentally, right at 140K miles. Engine sounds the same, MOT taps the same. No obvious problems. Suggest replacing this MOT? Get a computer read and clear the codes? Looking for suggestions please.
MBWorld Fanatic!
Joined: Apr 2007
Posts: 6,171
Likes: 16
300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
the cam followers
are self adjusting.
get the codes read or go to harborfreight and buy a code reader and read them.
We need to know whats up in order to figure out what's up.
get the codes read or go to harborfreight and buy a code reader and read them.
We need to know whats up in order to figure out what's up.
