Strange Idle
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Joined: Nov 2024
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W211
Strange Idle
Hi, I drive W211 2003 e320, I got problem when engine gets hot I am getting rough idle when transmission is in gear it is too feelable, if it is parking or neutral it is less noticeable but in both condition RPM is low, when in P/N it has 780RPM, when changing gear D/R it is going to 600RPM and comes idle and jerking. But everything is gone when battery lights comes on, Electrical Consumers Switched Off and everything is fine, RPM is in gear or not is going up to 900 and car runs perfect, no jerks, no idling.
Changed MAF sensor, working perfect
Changed Fuel Filter
Both Battery is good
Alternator is good
Can anyone say what does this need to be fixed? Thank you
Changed MAF sensor, working perfect
Changed Fuel Filter
Both Battery is good
Alternator is good
Can anyone say what does this need to be fixed? Thank you
Out Of Control!!
Joined: Apr 2019
Posts: 12,003
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
perfect!
Secondary air valves leak in air into exhaust that oxygen sensors flags as lean combustion making engine too rich and wonky fuel map.
Reading your fuel trims should confirm.
Last edited by CaliBenzDriver; Nov 21, 2024 at 05:41 PM.
Thread Starter
Newbie
Joined: Nov 2024
Posts: 7
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W211
Yeah, but why everything is working when there is no power in interior?
When that warning light comes on dash, I can't use my comfort features like seat heat, seat moving and other. When this happens the engine is working perfect, no idling, no jerking, when I stop I can't even feel the engine is running or not
When that warning light comes on dash, I can't use my comfort features like seat heat, seat moving and other. When this happens the engine is working perfect, no idling, no jerking, when I stop I can't even feel the engine is running or not
Out Of Control!!
Joined: Apr 2019
Posts: 12,003
Likes: 6,827
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
Yeah, but why everything is working when there is no power in interior?
When that warning light comes on dash, I can't use my comfort features like seat heat, seat moving and other. When this happens the engine is working perfect, no idling, no jerking, when I stop I can't even feel the engine is running or not
When that warning light comes on dash, I can't use my comfort features like seat heat, seat moving and other. When this happens the engine is working perfect, no idling, no jerking, when I stop I can't even feel the engine is running or not
Last edited by CaliBenzDriver; Nov 22, 2024 at 03:48 AM.
Thread Starter
Newbie
Joined: Nov 2024
Posts: 7
Likes: 0
W211
I think there is only electrical issue which is caused by undefined reason, I just want to know if someone had this problem to give me advice from where should I start to solve it. Those codes are not causing this problem, because when electrical consumers are turned off everything is fine and maybe problem in Relay? Why there is low RPM until comfort block is getting electricity and when it is turned off by computer, engine is working smoothly. IDK
