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   W204 - C Classe
     RPM not stable when idling (misfire)
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Poster Thread
hady
Posted on: 2013/7/5 19:14
Just popping in
Joined: 2013/6/23
From: Shah Alam Selangor
Posts: 4
Benz Model: W204
Message:
RPM not stable when idling (misfire)
Hi, I own a 2006 w204 recond from UK. Anyboday with same model have experience with this issue.

Thanks
HADY
droll
Posted on: 2013/7/7 10:02
Quite a regular
Joined: 2012/8/30
From:
Posts: 68
Benz Model:
Message:
Re: RPM not stable when idling (misfire)
the usual culprits - irrespective of any car
1. clogged air intake (check your air filter)
2. faulty / dirty MAF (less likely but still a possibility)
3. time to change spark plugs
4. ignition coils
5. worst case scenario - carbon build-up. this one requires engine to be opened and cleaned (cleaning is a lot of work!) one way to find out is insert borescope and take a look.
6. faulty throttle body controller

take it to a shop that has diagnostic equipment and do a scan first. that is usually the best place to start.
hady
Posted on: 2013/7/7 10:43
Just popping in
Joined: 2013/6/23
From: Shah Alam Selangor
Posts: 4
Benz Model: W204
Message:
Re: RPM not stable when idling (misfire)
Hi Droll,

Thanks a lot for you sharing. If there is carbon build up is actually the problem, is it show any error code or check engine light (CEL) will on? Since my car not show anything . Is any workshop you can recommend that have borescope equipment? Thanks
droll
Posted on: 2013/7/10 0:31
Quite a regular
Joined: 2012/8/30
From:
Posts: 68
Benz Model:
Message:
Re: RPM not stable when idling (misfire)
i won't go down that route first.

i would inspect the other easier parts first.
a. air filter
b. maf
c. spark plugs - pull out and check for fouling / carbon
d. i forgot to mention above - fuel filter (have u changed this?)

i believe there is a posting in this forum somewhere with a list of kedai2 that can help you with your problem.
hady
Posted on: 2013/7/21 12:25
Just popping in
Joined: 2013/6/23
From: Shah Alam Selangor
Posts: 4
Benz Model: W204
Message:
Re: RPM not stable when idling (misfire)
Sharing update

I went to the german motor and after diagnosis one by one, they find fuel pump control unit faulty.
The control unit has been changed (RM 980 with 3 months warranty) and problem solved (not 100%) but misfiring still occur when the engine is cold (in the morning or after the car left a few hours)
The service advisor told that the throttle body near supercharger faulty and it is about RM 5k++.
Can anyone give an opinion?

TQVM
-hady-
bonson
Posted on: 2013/7/21 13:55
Home away from home
Joined: 2010/10/23
From: Ampang/Cheras
Posts: 326
Benz Model: W204 / W211 / W221
Message:
Re: RPM not stable when idling (misfire)
Quote:

hady wrote:
Sharing update

I went to the german motor and after diagnosis one by one, they find fuel pump control unit faulty.
The control unit has been changed (RM 980 with 3 months warranty) and problem solved (not 100%) but misfiring still occur when the engine is cold (in the morning or after the car left a few hours)
The service advisor told that the throttle body near supercharger faulty and it is about RM 5k++.
Can anyone give an opinion?

TQVM
-hady-


Bro,
You now just change to original Mercedes spark plug 4 pcs.
While removing the old plug, see any of the plug got wet with engine oil.
If yes, change the casket also.
Than test itfor some drive, if still having the same problem, than you must change the ignition coil as well.
As for the throttle body, no need to change,
If you like, sent to me, I will service & repair the throttle body for you.

Sometime the Star cannot show the faulty value. (too fast & too small)

anak james bon
hady
Posted on: 2013/7/21 15:51
Just popping in
Joined: 2013/6/23
From: Shah Alam Selangor
Posts: 4
Benz Model: W204
Message:
Re: RPM not stable when idling (misfire)
Hi Mr Bonson,

Thanks for your advise.
For your info, i have changed the spark plug and the ignition coil too before i sent to German Motor at other mechanic.
The previous mechanics also did the throttle body service and do the adaptation and learning process. All hose also already changed.
You are wright when said that no faulty value shows so far.
I'am happy if you can further check my car and please advise your contact no or address.

Thanks
-hady-
012-280 9500
bonson
Posted on: 2013/7/23 10:47
Home away from home
Joined: 2010/10/23
From: Ampang/Cheras
Posts: 326
Benz Model: W204 / W211 / W221
Message:
Re: RPM not stable when idling (misfire)
Quote:

hady wrote:
Hi Mr Bonson,

Thanks for your advise.
For your info, i have changed the spark plug and the ignition coil too before i sent to German Motor at other mechanic.
The previous mechanics also did the throttle body service and do the adaptation and learning process. All hose also already changed.
You are wright when said that no faulty value shows so far.
I'am happy if you can further check my car and please advise your contact no or address.

Thanks
-hady-
012-280 9500


Thank you bro,
Our company is very very small and located behind the
Sekolah Pandan Indah, (In between both Secondary & Primary School.
I am no expert or ex-worker of C&C or Hup Seng.
But if you would let me try, Pls call me to make appointment b4 you come.
012-3030788.

Bonson Auto Facelift,
No: 10, Jalan Maju 1/16.
Off Jalan Pandan Aman.
Taman Lembah Maju.
56100
Kuala Lumpur.



winsonchew
Posted on: 2013/7/24 0:03
Quite a regular
Joined: 2013/1/12
From: Kuala Lumpur
Posts: 69
Benz Model: W204 C200K
Message:
Re: RPM not stable when idling (misfire)
wowww. bonson, u are not small.. even the customer from german motors want to install head unit they also recommend ur place.. wowww..
jason1986
Posted on: 2013/7/24 13:27
Home away from home
Joined: 2010/4/15
From: Sitiawan/KL
Posts: 195
Benz Model: E220
Message:
Re: RPM not stable when idling (misfire)
Bonson, are you able to repair and service w124 m111 throttle body?

How much will it cost and how long do I have to leave the car there? Can it be done in a day?
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