Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > Mercedes-Benz Tech Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 07-23-2007, 11:31 PM
Registered User
 
Join Date: Oct 2001
Location: USA
Posts: 102
M120 V12 question

My 97 S600 start misfiring again, it happened last summer but the problem was gone for a while, now it is coming back.

The car was sitting for a month and I got a chance to drive it last weekend. I am from HK and the traffic is so bad so I got stuck in traffic for at least 30 mins at hot and humid condition.

1)my outside temp sensor quit working (that's always happen in summer when caugh in traffic in summer)
2) then suddenly i realize that my low engine oil warning, ABS and BAS/ESP warning light are on, also all the gauge are not working except the speedometer and the oil pressure, the oil pressure is in ok shape (1.5 and will climb to 3 when hit the gas) and the car seems normal, so i keep driving til find a safe area to stop my car. I turn off and restart the car again, the car works perfect, all the warning lights gone..........................

I keep driving and then parked outside a restaurant and have dinner, when i return to the car, it start normally and drive perfectly
after 15 mins of highway traffic i come to a traffic light, then i feel the car is shaking, the idle rpm is not stable but only jump between 600-800.

3) this happened before and when i head back to home i open the hood, put the key at start position (but not turn on the engine), i heard a bee sound from the place i circle in red. i am not sure if it is from there or somewhere behind. It is from the Left hand bank of the V12 when i am facing at the engine.


My question is
1) does anybody has this kind of experience?
2) my AC panel light will be dimmed when switch on my turn signal, it is at night time and i have my AC on. I changed my battery recently, is it the generator?
3) My car has no ESP or BA or ABS, but there's also no warning light on the dash, i can turn on/off ESP (althought it is not working) after start but wont able to after drive for like 20 mins, anyone experience? I brought to an INDY to check and they said the whole ESP computer need to be replace so i dont even bother to touch it.

THank you
Attached Thumbnails
M120 V12 question-tn_20070722003456.jpg   M120 V12 question-tn_20070722003449.jpg  
Reply With Quote
  #2  
Old 07-24-2007, 08:09 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
If you have a volt meter & can connect it while driving, then watch the charging voltage while that problem is happening.

You can get a cigar lighter voltmeter at many parts stores OR radio shack.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 07-25-2007, 06:50 AM
Registered User
 
Join Date: Oct 2001
Location: USA
Posts: 102
Thx DOC, will try first and let u know the result
Reply With Quote
  #4  
Old 07-25-2007, 09:44 AM
Registered User
 
Join Date: Jun 2007
Posts: 28
You might have a compound problem. One may be with your instrument cluster resetting, and the onther one with the engine shutting down. On the cluster reset, check this Instrument Cluster Resets 1992 400SE
__________________
2004 CL 500
1992 400 SE
Reply With Quote
  #5  
Old 07-25-2007, 07:36 PM
Registered User
 
Join Date: Sep 2002
Posts: 23
Could it be your wiring harness - I think 1995 is a bad year for those. My 1994S600 misfired frequently when mine went bad.
Reply With Quote
  #6  
Old 07-25-2007, 11:47 PM
Registered User
 
Join Date: Oct 2001
Location: USA
Posts: 102
Quote:
Originally Posted by jkmmrs View Post
Could it be your wiring harness - I think 1995 is a bad year for those. My 1994S600 misfired frequently when mine went bad.
but my car is 97, so i am not if this might be the problem or not
some said it might......

i checked some of the wire and they looks ok
Reply With Quote
  #7  
Old 07-25-2007, 11:58 PM
Registered User
 
Join Date: Oct 2001
Location: USA
Posts: 102
Quote:
Originally Posted by bells_77 View Post
You might have a compound problem. One may be with your instrument cluster resetting, and the onther one with the engine shutting down. On the cluster reset, check this Instrument Cluster Resets 1992 400SE

i think my instrument cluster are ok....just not sure if that's wiring harness or the generator problem
Reply With Quote
  #8  
Old 08-01-2007, 10:51 PM
Registered User
 
Join Date: Oct 2001
Location: USA
Posts: 102
M120 V12 questions update

Brought the car to Indy to check.

Code said one of the O2 sensor fault
Changed O2 sensor and now cylinder 5 misfired
switch coil from cylinder 5 to cylinder 3
check again and misfire on cylinder 3
so coil is the problem!

will replace it and check if there's some other hidden problem
Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 10:31 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page