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 03-02-2002, 08:17 PM
Registered User
 
Join Date: Nov 2000
Location: Ontario, Canada
Posts: 463
Spark plug connector is putting on a light show!

The 5th out of 6 plug connectors has a spark which is visible everytime the cylinder fires!!!

I have just put in a new set of plugs before I brought the car out of winter storage......

What have I done here???

Please help me!!!!

Thank you,
Mike McKinney
__________________
190E 2.6 - 244 000 km
Reply With Quote
  #2  
Old 03-02-2002, 09:00 PM
Registered User
 
Join Date: Nov 2000
Location: Ontario, Canada
Posts: 463
I just pulled out the plug and it is fine, slight brownish colour on top, no carbon deposits or oil deposits....

The plug connector has a little hole in the rubber boot, causing some spark to go through it......

This must be the cause of the shaky idle right???

Please advise guys, much appreciated.

Mike McKinney
__________________
190E 2.6 - 244 000 km
Reply With Quote
  #3  
Old 03-02-2002, 10:38 PM
Registered User
 
Join Date: Feb 2002
Location: east coast
Posts: 1,255
Plug wires are so susceptible to breakage they make plug pulling plliers to protect the leads. Did you use plug pulling pliers? did you yank on the wires?

A torn lead can cause idle problems.
Reply With Quote
  #4  
Old 03-03-2002, 12:05 AM
Registered User
 
Join Date: Nov 2000
Location: Ontario, Canada
Posts: 463
Yes I did pull the last two connectors out with pliers......

Used electrical tape to cover rip in plug connector boot, reinstalled and it idles fine now.

I will order a new set of plug wires on Monday to make sure my idle stays smooth as silk...

Thank you for your help Ethan.

Mike McKinney
__________________
190E 2.6 - 244 000 km
Reply With Quote
  #5  
Old 03-03-2002, 12:57 AM
Member
 
Join Date: Feb 2000
Location: seattle, wa
Posts: 87
plug con

mike..you can save youself a few bucks by buying just the plug connector ends. paul
__________________
Paul Roberts
Mercedes Centrum Inc.
Bellevue,WA.
Reply With Quote
  #6  
Old 03-03-2002, 01:44 PM
pmizell's Avatar
Benz Zealot
 
Join Date: Jun 2001
Location: Houston, Texas
Posts: 838
Those plug wire ends have a ceramic (I think) fitting inside the rubber. If you crack this part while trying to pull the wire out it will cause mis-firing. Just replace the plug connector end like Paul suggested. The wire itself screws into the plug connector -- just push the wire deep down inside the connector and start rotating clockwise. I think it's like $10 from Fastlane.

Good luck!

~Paul

_________________
'91 300E, 208k miles
Reply With Quote
  #7  
Old 03-03-2002, 02:09 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
See my reply to your other post. The act of removing and replacing spark plugs bears a significant risk of causing these failures no matter how skillful one is.

We are now replacing the plug end under the three coils on all E320 (or other HFM 104 motors) that we replace plugs on due to the fact that at least one in twenty won't make it through the operation. This means that about every third car will wind up with a intermittant misfire that is almost impossible to scientifically diagnose after plug replacement. The other motors with plug wires are very easy to diagnose so we don't regularly shot gun them. We are starting to replace in groups such failures as we charge more for the diagnosis than the cost of the connectors.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #8  
Old 03-03-2002, 03:03 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
SB,
I have just replaced the 3 coil boots on a 104 and happen to notice that the replacement [ Beru] coil ends were about 1/3
of an inch shorter than the Bosch I was replacing. [ same part #]
Have you been using the Beru and if so, no problem?
I am sure the coil spring compresses on the plug tip, but by how much can't be measured.

Thanks.
Arthur Dalton
Reply With Quote
  #9  
Old 03-03-2002, 03:18 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Sounds like a good question, unfortunately I almost never actually replace parts anymore. I only do diagnostics and even there I have an assistant that hooks up the tooling I require. About the only bolts I turn anymore are those involved in doing wheel alignments which I usually do 3-8 of a day.

I like doing alignments as it is the last "tunable" item on a modern car. I get great pleasure solving problems through adjustments.

The last 104 we put connectors on I happened to be standing next to my assistant and I did notice a manufacturing difference between the new end and one that he had already replaced. I will have to take a better look next time. Sorry I don't have a better answer.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #10  
Old 03-03-2002, 03:31 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
Thanks.
I always thought I would enjoy the alignment trade myself.
Something attractive about it.
Actually have made up a few of my own tools for the 113 chassis. Have posted plans for one to do the rear axle centralizing on the group.

Anyway, to my surprise, after changing the boots to 2,4,and 6,
I pop up codes 21,22,23 on the HFM ignition module [ socket #8]
Coil output low, wires , plugs.-- seems too much of a coincidence to me.
Guess I will have to do some test...
Forunately, I kept a set of the 1,3, and 5 wires , so I guess I can substitute them for the coil tower ones to take some readings.
Is that how you would get to the secondary on the 104 set-up?
Again,
Thank you
Reply With Quote
  #11  
Old 03-03-2002, 03:55 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Confidence in reading secondary patterns comes from experience. I do not have much with 104 motors. I have used inductive pick-ups somewhat like the old GM HEI distributor adaptors most scopes used to have. The patterns have been poor and only one at a time, so I haven't liked using them for the normal things I would do with secondary. So far the best results have been to look at the primary and/or to current ramp the primary. I just bought one of the new Vetronix MTS5100 scopes and will try and see what I can get hooking to the plug wires. I presume that this is like waste spark systems and both plugs should appear on each wire. The question will be what to use as a sync pulse.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #12  
Old 03-03-2002, 04:01 PM
Registered User
 
Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,777
<>

Yes, being a 2 plug series circuit should show on either side as the coil circuit is a complete loop.
I would be interest in anything you may find/come up with.
Reply With Quote
  #13  
Old 03-03-2002, 04:48 PM
livesound2
Guest
 
Posts: n/a
85 380 sl

I'm replacing plugs and was advised to use Bosch Platinum WR 9 DP type with gap of .032. Is this correct. Having trouble locating document specifying gap measurment. Any help appreciated.
Thanks for the wire pulling advice as I'm trying to be super sensitive to how I remove them.
Reply With Quote
  #14  
Old 03-03-2002, 05:30 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Don't waste your money on the Platinums. Not only does MB specifically recommend against there use, but they are well known to cause numerous driveability problems. Use the copper core that was standard.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #15  
Old 03-03-2002, 05:56 PM
livesound2
Guest
 
Posts: n/a
Cool thanks

Thanks for the quick response. People who don't mind helping people, what a concept. Anyway being impulsive self I have all ready installed four of eight plugs and now must ask if I should pull them out ?? or continue. I'll wait this time. Is .032 gap correct ? Also have 1 gallon of MB antifreeze. Will mixing with one gallon of distilled water achieve level of coolant necessary if I drain radiator? Again thanks for the help.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Another Glow Plug Light Question... george d Diesel Discussion 2 01-24-2005 10:23 PM
Glow Plug & Check Engine Light On - Relay??? JHZR2 Diesel Discussion 0 05-12-2004 11:09 PM
major problem...spark plug wires hgupta Tech Help 0 10-19-2002 08:15 PM
Spark plug help BENZ-LGB Tech Help 2 09-13-2002 09:06 AM
Glow Plug relay light trouble...maybe patsy Diesel Discussion 2 12-27-2000 12:46 PM



All times are GMT -4. The time now is 12:08 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