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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-30-2004, 12:46 PM
Registered User
 
Join Date: Nov 2002
Location: Oklahoma City. OK
Posts: 38
rough idle after battery change

I have a 1999 C230K with approx 68K miles. Last Sunday, the battery was dead and the starter wouldn't crank. I jumped the car and it drove fine the rest of the day. The next day, it seemed to be cranking a little slow, so I took it to my indie to check the battery. He replaced the OEM battery with an Interstate and immediately upon leaving the shop, the "check engine" light came on and the car started idling roughly. I took it back to the shop, they checked and thought it was the computer system in the car resetting itself. Indie told me to drive it for a week and see if problem persists. The car drove fine for one day and then started idling rough and check engine light came on again. It seems to only run rough when idling, not at higher speed. Any thoughts?
Reply With Quote
  #2  
Old 06-30-2004, 04:51 PM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
The fuel computer constantly changes the fuel mixture & adapts to sensor imputs. IF the battery goes dead & is disconnected then the fuel computer must re-adapt to the sensors again & that takes 10-50 miles of (light footed) driving to accomplish.

What codes come out of the computer?? P0170/173 are for fuel trim & mean that the DME/air mass sensor correction at limit.
__________________
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 06-30-2004, 05:01 PM
Registered User
 
Join Date: Nov 2002
Location: Oklahoma City. OK
Posts: 38
Thanks for your reply M.B.Doc - They didn't tell me what the codes were, but did mention that it showed something with the number 4 cylinder. The indie shop owner said he didn't see how the battery change could affect a cylinder and that's why he thought it would adjust itself within a week. I will remind my wife to be "lightfooted" for the next several miles. Hopefully, your explanation is correct - the car ran perfectly before the battery was disconnected. Thanks again. BTW, any problems you know of using the Interstate battery instead of OEM?
Reply With Quote
  #4  
Old 06-30-2004, 05:12 PM
forp's Avatar
Registered User
 
Join Date: Jul 2003
Location: Sebastopol, CA
Posts: 324
98 C280 w/64K, Bad Airbag?

You might be interested in the post from "BLACKMERCEDES" in this thread.

Dan
Reply With Quote
  #5  
Old 06-30-2004, 05:18 PM
Registered User
 
Join Date: Nov 2002
Location: Oklahoma City. OK
Posts: 38
OUCH! - I followed the "jump start" instructions in the manual carefully. I would hope that if a significant possibility existed that damage could result from jump starting the car, the manual would advise not to do it - not give instructions on how to do it.
Reply With Quote
  #6  
Old 07-01-2004, 02:24 PM
forp's Avatar
Registered User
 
Join Date: Jul 2003
Location: Sebastopol, CA
Posts: 324
I would think you are OK if you followed the instructions in the manual. BUT...It also looks like there is potential for some damage during this operation. I suppose you just have to weigh the risk VS the benefit and do what you think is best.

Dan
Reply With Quote
  #7  
Old 07-01-2004, 02:54 PM
Registered User
 
Join Date: Nov 2002
Location: Oklahoma City. OK
Posts: 38
Update - my wife reports the car seems to be running fine now - I guess (hope) the problem was as diagnosed by M.D.Doc. I admit that after reading some of the info posted, I am now paranoid about jump-starting. Thanks, guys, for the input!
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

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 10:14 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page