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  #1  
Old 10-02-2006, 03:21 PM
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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.
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Old 10-02-2006, 04:49 PM
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Are you the same guy that just had the timing chain replaced?
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Old 10-02-2006, 05:01 PM
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no.
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Old 10-02-2006, 05:12 PM
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Oh, ok , someone just called me with those similar problems on a 97 e-420 that just had a timing chain replaced and oiler tubes replaced due to engine ticking.
I was just wondering why those important details may have been left out.
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Old 10-02-2006, 05:15 PM
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Those 119 engines are notorious for having the plastic oiler tubes blow out inside the valve cover.

Question: Did the ticking noise and the rough idle happen simultaneously or one before the other?

You may or may not have more than one problem.
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Old 10-02-2006, 05:23 PM
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i've had the car for only 2 days so i can't say for sure when they started. possibly a while ago.

i was browsing another thread and found some interesting info. this gentleman had a very similar tapping noise, but check out his solution:

"
Turns out the problem was related to a Tech Service Bulletin P-B-07,00/21F-1260. They replaced front engine mounts with an updated mount. It completely quieted the engine ticking noise.

"
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