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 03-10-2010, 06:14 PM
777funk's Avatar
Registered User
 
Join Date: Dec 2006
Posts: 1,031
E320 Missing and not getting any coil codes

EDIT:
I think I have it figured out. Bad wires. I haven't changed them yet because I just also figured out I believe the car has a bad head gasket. It white smokes when hot and driven hard.

But last night I decided to work on it for a second and noticed (it was a VERY dark night) while running that I could see arcing through the plug wires. It was faint but there were sparks through the insulation to the valve cover on all 3 wires (or at least two of the three). Also, the number 2 or 3 *the one with the plug wire can't remember* boot on the plug was easy to see that it was arcing to the valve cover whenever there was a mis. So......... seems like I've found the problem.

At this point I'm guessing the common failure of plug wires is the die-electric properties of the insulation. Maybe a ton of electrical tape would fix that! Of course the real fix is to just change the wires.

But on to bigger things. The head gasket!









I was thinking ignition (was getting a 22 and 23 code). I changed the spark plugs and boots below the coils. I used Bosch F8DC4 Copper Non Resistor plugs.

Now I'm still getting a mis on some cylinders but I'm only getting a

4 Hot film mass air flow sensor
13 O2S (Lambda) control system operating at rich or lean limit

I'm getting really confused by this thing.

I noticed if I let one of the vacuum hoses loose it will exaggerate the misfire.

I did a little EGR testing (ran a vac line direct to the EGR on and off and plugged the line when not on the EGR). It ran bad when connected to the EGR but It also seemed like the EGR itself has a leak I haven't Mighty-Vac tested it for holding vacuum but just sucking on the vac line I'm getting no resistance.

Can a vacuum leak cause a misfire?

__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.

Last edited by 777funk; 03-18-2010 at 07:57 AM.
Reply With Quote
  #2  
Old 03-10-2010, 06:27 PM
Registered User
 
Join Date: Dec 2006
Location: beautiful Bucks Co, PA
Posts: 961
This happened to me awhile back. Turned out to be the engine wire harness.
Reply With Quote
  #3  
Old 03-10-2010, 06:39 PM
777funk's Avatar
Registered User
 
Join Date: Dec 2006
Posts: 1,031
I notice some wire rot on the X28(?) connector the one that sends the starter it's signa.

I also notice that the tube going to the EGR and that little electrical vacuum block isn't giving much (if any) vacuum.

The last thing I checked is the diaphragm on the EGR itself. It will not hold vacuum with a vacuum tester. It doesn't hold ANY vacuum.

Should I try disconnecting the EGR pipe at the EGR and see if it improves? Maybe stuck open?

I cut open some of the wire harness and the two spots I saw (between the head and firewall) look good.
__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.
Reply With Quote
  #4  
Old 03-10-2010, 08:54 PM
Registered User
 
Join Date: Feb 2010
Location: NYC AND ATHENS GREECE
Posts: 103
Quote:
Originally Posted by 777funk View Post
I notice some wire rot on the X28(?) connector the one that sends the starter it's signa.

I also notice that the tube going to the EGR and that little electrical vacuum block isn't giving much (if any) vacuum.

The last thing I checked is the diaphragm on the EGR itself. It will not hold vacuum with a vacuum tester. It doesn't hold ANY vacuum.

Should I try disconnecting the EGR pipe at the EGR and see if it improves? Maybe stuck open?

I cut open some of the wire harness and the two spots I saw (between the head and firewall) look good.

I had a problem with my 93 400 SEL missing. I found the EGR hose was broken and drove for a day without it and it made absolutely no difference. Mine missed under load and after changing plug , suppressors , caps n rotors we pulled the coils and saw one was white from arcing .

Changed it and all is well . Look up my profile to find my posts in my old thread to see if your problem is similar. Had 3 MB techs put scanner on it and it drew no codes although one coil was bad.

Do not believe what scanners do not tell you !
Reply With Quote
  #5  
Old 03-10-2010, 09:59 PM
777funk's Avatar
Registered User
 
Join Date: Dec 2006
Posts: 1,031
I will have to try a new coil or two. I am noticing quite a variance in the idle with a vacuum line allowed to leak. If I let it leak I notice it misses like crazy. When I put the line back the missing diminishes but it's still there. That makes me really wonder if there's a vacuum leak somewhere. I think I hear a leak around the throttle body area but I'm not sure. I do notice there's not much vacuum in the little electronic block at the front left side of the head.

__________________
-E300d '99 350k
-Suburban '93 220k
-TDI Jetta '03 350k
Sold
-F250 '96 7.3
-Dodge Ram 12V
-E320 '95 200k
-E320 Wagon 1994 155k
-300d Turbo '87 187k miles
-E320 1994 200k
-300d Turbo '84 245k (sold to Dan62)
-300d Turbo '84 180k
-300sd '80 300k
-7.3 Powerstroke Diesel 15P Van 500k+ miles
-190d '89 Non Turbo 2.5 5cyl 240k (my first MB)
Tom's Imports of Columbia MO Ruined the IP in changing leaky delivery valve O-Rings - Refused to stand behind his work. Mid-MO MB drivers-AVOID Tom's.
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 04:39 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, 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