Bad idle speed only cold start (W210 E50 AMG)
MBWorld Fanatic!
Joined: Aug 2006
Posts: 7,053
Likes: 398
From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
If you have bad MAF, will forcing "bad performance/little bit playing in low ideal/bad fuel consumption"..!
try to diagnose the car first, MAF is soo sensitive for "RPM ideal range/proper mixture/stable performance",,
that will directly affect to the fuel trim & functional signal of O2 sensors..!!
ZAYED,,
try to diagnose the car first, MAF is soo sensitive for "RPM ideal range/proper mixture/stable performance",,
that will directly affect to the fuel trim & functional signal of O2 sensors..!!
ZAYED,,
Super Member
Joined: Dec 2009
Posts: 748
Likes: 93
From: Dhahran, KSA
2020 E 300 Coupe and 2019 GLS 400
Unstable idle could be the result of:
1- Dirty/bad MAF.
2- Vacuum leak.
3- Old spark plugs/wires.
4- Clogged/bad EGR system (the valve could be stuck partly open while idle)
5- Bad O2 sensors.
6- Partly clogged catalytic convertors, since it's only noticeable on idle and exhaust pressure is low.
7- Valve covers leaking into the plugs.
8- A problem in the fuel system (pump, filter, injectors....)
9- Carbon build-up causes the valves not to close properly.
I can't help you precisely, but these engines are a PITB when it comes to diagnosing rough idle/misfire.
I'm diagnosing the same issue, drove me crazy.
1- Dirty/bad MAF.
2- Vacuum leak.
3- Old spark plugs/wires.
4- Clogged/bad EGR system (the valve could be stuck partly open while idle)
5- Bad O2 sensors.
6- Partly clogged catalytic convertors, since it's only noticeable on idle and exhaust pressure is low.
7- Valve covers leaking into the plugs.
8- A problem in the fuel system (pump, filter, injectors....)
9- Carbon build-up causes the valves not to close properly.
I can't help you precisely, but these engines are a PITB when it comes to diagnosing rough idle/misfire.
I'm diagnosing the same issue, drove me crazy.
MBWorld Fanatic!
Joined: Aug 2006
Posts: 7,053
Likes: 398
From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
If fuel trim is OK, prefer to check MAF & TB..!,
if you replace any of them, and those issues still remain, afraid your ECU went away, which i hope NOT..!!
ZAYED,,
if you replace any of them, and those issues still remain, afraid your ECU went away, which i hope NOT..!!
ZAYED,,
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MBWorld Fanatic!
Joined: Aug 2006
Posts: 7,053
Likes: 398
From: A.D., U.A.E
2000 (W202 C200) & 2000 (W202 C55)
Try to check if there are any leak around the MAF, or "8" O-rings in intake manifold,
also position sensor in the TB may NOT reads the air pressure properly, this also could cause same your issue,
i know this is some kind of Hard job on M119,,
little bit patient will solve this mystery..?!?
ZAYED,,
also position sensor in the TB may NOT reads the air pressure properly, this also could cause same your issue,
i know this is some kind of Hard job on M119,,
little bit patient will solve this mystery..?!?
ZAYED,,
Thread Starter
Newbie
Joined: Nov 2013
Posts: 11
Likes: 0
w210 E50 AMG
Тhis is a problem that occurs when a cold start today and warmed car.When the car is cold I can't touch the accelerator , dies out , bounce ..
Last edited by igra4a; Mar 8, 2016 at 02:35 AM.
