2 engine problems in 1997 E420
Thread Starter
MBWorld Fanatic!
Joined: Jan 2004
Posts: 1,461
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From: Baltimore MD
MB, BMW
2 engine problems in 1997 E420
97 E420 119 engine, 105k miles
problems:
1. at idle or moving, there is a tapping/ticking noise that seems to be coming from the lower half of the engine (rod bearing?). happens at P, N or D. The tapping gets quicker when I shift to N/D than at P, and the frequency increases as I give more gas. What is the problem and how urgently should this be addressed?
2. Car has a rough idle (at D or P, but worse in D). At P rpm is a bit higher but at D when the rpm is at about 700, the rpm would drop to 400-500 and then the car would get it up to 700 again.. this happens every 15-20 seconds. Car doesn't die though. No engine malfunction codes.
problems:
1. at idle or moving, there is a tapping/ticking noise that seems to be coming from the lower half of the engine (rod bearing?). happens at P, N or D. The tapping gets quicker when I shift to N/D than at P, and the frequency increases as I give more gas. What is the problem and how urgently should this be addressed?
2. Car has a rough idle (at D or P, but worse in D). At P rpm is a bit higher but at D when the rpm is at about 700, the rpm would drop to 400-500 and then the car would get it up to 700 again.. this happens every 15-20 seconds. Car doesn't die though. No engine malfunction codes.
Newbie
Joined: Oct 2006
Posts: 9
Likes: 0
the ticking noise is probley the oiling tubes for the lifters they blow out the ends of the little plastic tubes and that lifter dosent pump up. now for the idle problem could be lots of things. but first i would try cleaning the throttle actuator. just remove the airmass and open the throttle with a screw driver and get some carb and choke cleaner and a small wire brush and clean off all the carbon. while your there check the breather hose to the valve cover and see if it is cracked.
Junior Member
Joined: Mar 2007
Posts: 33
Likes: 0
From: Chandler, AZ
2001 E55 Silver with Charcoal/Ruby
This sounds like what I need to do
Replacing the tubes between the lifters sounds like what I need to do on a 2001 E320. Has anyone on here done it? Does anyone know of any DIY procedures on this job?
Thanks for any help.
Thanks for any help.
MBWorld Fanatic!
Joined: Sep 2005
Posts: 6,189
Likes: 241
From: Albuquerque
'10 CL550, '12 GL550
The M119 engine and your M112 V6 are different designs and yours doesn't suffer the same problem.
http://www.mercedesshop.com/Wikka/M119OilGuides
http://www.mercedesshop.com/Wikka/M119OilGuides
