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 05-27-2002, 06:48 AM
s60
Guest
 
Posts: n/a
'92 400E Idle problem

My car has 97,000 miles on it.I replaced rotor, cap, spark plugs, and oil change about 5 weeks ago. I have been experiencing a occasional idle problem in which, the car just vibrates. I cannot pinpoint the vibration. It is getting worse though and the car starts shaking at signal lights or while in park. This problem occured about 2wees ago and I just changed out the trans filter and fluid tonight. I checked the level. It is not overfull or underfilled while, the car is idling. The check engine light went on once but, soon disappeared after restarting the car. I checked the red led but, no flashes from the diagnositc. Check engine light only appeared for a minute then, disappeared. I am wondering if this could be a oxygen sensor problem but, it happens now when I drive the car for a minute. Before, it was only after driving for awhile. Anyone else with this problem before?
Reply With Quote
  #2  
Old 05-27-2002, 05:39 PM
Registered User
 
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
I don't have an answer but would love to hear if anyone has a fix for this. Mine has ALWAYS vibrated at idle, in drive, in warm weather. When I took it to the dealer when it had 25,000 miles, they said "They all do that" and attributed it to the V8. It now has 113,000 miles and is doing it just like it did 6 years ago.

Mine does NOT do this in cool weather. I have a new fuel pressure regulator, new rotors/caps, and spark plugs. New motor mounts helped a little but it's still noticable and annoying.
__________________
Steve
'93 400E
Reply With Quote
  #3  
Old 05-27-2002, 09:36 PM
Michael's Avatar
Veteran
 
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
Great place to start is to track down some BG 44K to clean up injectors/combustion chambers/valves. Makes Techron look worthless. Also, replace your trans mount.

Those things done, let us know, and good luck!

FWIW, an M119 does NOT do that-when mine has fresh caps & rotors, the only way to tell its idling is to look at the tach
__________________
"If everything seems under control, you're simply not going fast enough" --Mario Andretti

Michael
1995 E500 street car
1986 Porsche 944 Turbo S track car
Reply With Quote
  #4  
Old 05-28-2002, 12:21 AM
Registered User
 
Join Date: Feb 2002
Posts: 29
also if you used titanium spark plugs, go back to copper. My 260E did the same thing, but when I changed back to copper the problem was gone.

Matt
__________________
1988 260E
Reply With Quote
  #5  
Old 05-30-2002, 04:02 AM
s60
Guest
 
Posts: n/a
Quote:
Originally posted by Michael
Great place to start is to track down some BG 44K to clean up injectors/combustion chambers/valves. Makes Techron look worthless. Also, replace your trans mount.

Those things done, let us know, and good luck!

FWIW, an M119 does NOT do that-when mine has fresh caps & rotors, the only way to tell its idling is to look at the tach
I called BG and then a local rep called me. He siad he could not sell it to me due, to lack of wholesale license. He referred me to Goodyear. Went there and they do not sell the BG44K itself alone. It comes in a pack of three which consists of the BG44K, intake manifold cleaner(special tool needed which, is not included either), and something else. It sold for $90. I don't think it is worth that much if, I am only using one of the three bottles.

Will try some fuel injection cleaner from Lubro Moly. I tried Techron and agree. It doesn't seem to do much if, anything at all.

The plugs are Bosch Super and are copper

As for the tach moving. I don't see it moving but, the vibration happens too fast or I just see the tailend of the tach moving. It moves but, ever so slightly.

Also, put some carb cleaner around the butterfly plate to, see if it got kind of dirty and resolve the problem. It did not do anything.

However, now it is setting off my check engine light occasionally. I think it is 17 short beeps. Is it code 17? Does anyone what this code means?

TIA
Reply With Quote
  #6  
Old 05-30-2002, 11:57 AM
Registered User
 
Join Date: Oct 2001
Location: Canada
Posts: 298
Maybe you can try Pennzoil fuel system cleaner, it cured the rough idle problem on my 400E.

I had experienced the same problem on my 92 400E, I also couldn't find BG 44K that Michael recommended, I then used Pennzoil fuel sytem cleaner instead, the rough idle problem was gone right after an Italian tuneup.

For details, you can search the thread post by me a couple of months ago.
__________________
99 BMW 540i 6-speed 110K Km
03 SAAB 9-5 wagon 80K Km
92 400E (Sold) 245K km
Still missing the days with the Benz, it kept me busy.
Reply With Quote
  #7  
Old 05-30-2002, 03:53 PM
blackmercedes's Avatar
Just a guy
 
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Have you checked the wiring harness(es) on the car? Your model is notorious for that problem.

Setting the CE light off sounds like an emissions fault. Could be an O2 sensor. Not sure if the decaying harness would set off the CE light, but I wouldn't rule it out, either.
__________________
John Shellenberg
1998 C230 "Black Betty" 240K

http://img31.exs.cx/img31/4050/tophat6.gif
Reply With Quote
  #8  
Old 05-30-2002, 03:55 PM
blackmercedes's Avatar
Just a guy
 
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Quote:
Originally posted by 400E
Mine does NOT do this in cool weather.
Often, warm weather vibrations are attributed to the AC compressor running, and the additional load it places on the engine. This causes the idle to feel a little different than it did during the cooler weather.
__________________
John Shellenberg
1998 C230 "Black Betty" 240K

http://img31.exs.cx/img31/4050/tophat6.gif
Reply With Quote
  #9  
Old 05-30-2002, 07:38 PM
Moderator
 
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
I was under the impression that the wiring harnesses were bad only from 1993-1995, and only on all M104 engines - on the C, E, and S classes - on the 2.8 and 3.2 liter engines.

The wiring harnesses on the 1990-1992 3.0 liter M104 300CE's were fine.

While there might be wiring harness issues with some 400E's, it is not systemic to the model, and not due to bad wiring insulation, but maybe chafing of the wires.
__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
Reply With Quote
  #10  
Old 05-30-2002, 08:16 PM
Registered User
 
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Thanks to all for helpful ideas!
Oddly, my idle problem seems to have, at least temporarily, gotten better, now that Omaha has hit 91 degrees F today ...

Now I'm trying to figure out why my 15A aux fan fuse keeps blowing...

Will try the Pennzoil product at some point -- have tried Techron and BG 44K without lasting effects.
__________________
Steve
'93 400E
Reply With Quote
  #11  
Old 05-31-2002, 12:19 AM
blackmercedes's Avatar
Just a guy
 
Join Date: Dec 2000
Location: St. Albert, Alberta, Canada
Posts: 3,492
Quote:
Originally posted by suginami
I was under the impression that the wiring harnesses were bad only from 1993-1995, and only on all M104 engines - on the C, E, and S classes - on the 2.8 and 3.2 liter engines.

The wiring harnesses on the 1990-1992 3.0 liter M104 300CE's were fine.

While there might be wiring harness issues with some 400E's, it is not systemic to the model, and not due to bad wiring insulation, but maybe chafing of the wires.
I remember reading somewhere that the M119 W124 equipped cars are also wiring harness defective. I could be wrong...
__________________
John Shellenberg
1998 C230 "Black Betty" 240K

http://img31.exs.cx/img31/4050/tophat6.gif
Reply With Quote
  #12  
Old 05-31-2002, 04:07 AM
s60
Guest
 
Posts: n/a
Well, my trouble codes are coming in 3s now. I have a code 2,15, and 17. I will change out the o2 sensor b/c of the code 2. I think the other two codes are due to the o2 sensor.

I bought some Lubro Moly Venti Sauber and Fuel Injection cleaner. Will try that out also.

Where is this engine harness that everyone is talking about on a 400e?
Reply With Quote
  #13  
Old 05-31-2002, 02:10 PM
Registered User
 
Join Date: Oct 2001
Location: Raleigh, NC
Posts: 51
The upper wiring harness runs along the top of the engine and can be seen by removing the air box. And yes, some of the 400e's do indeed suffer from the wiring harness problem. Mine was bad and I ordered the harness from PartsShop and installed it myself. You can check your harness yourself by using a double edge razor blade to make a small slit in the outer harness cover to peer inside and inspect the inner wiring insulation. When you look inside, you'll know if your harness is bad. Be extremely careful when doing the inspection so as not to disturb the inner wiring in case the insulation is breaking down.
Reply With Quote
  #14  
Old 05-31-2002, 02:24 PM
Registered User
 
Join Date: May 2001
Location: Charleston, SC
Posts: 237
Same problem on a 1992 400E.

It was the wiring harness. Happened while looking at car to purchase. In shorting out, it fried the controller which had to be replaced. I would definitely check the harness before you damage something expensive, if it hasn't been replaced.

Good luck.
__________________
2008 GL320CDI 6K
1970 280SL 112K
1982 240D 210K (Sold)
1973 220D 220K (Sold)
1967 200D 160K (Sold)
1992 400E 139K (Sold)
1988 300E 148K (Sold)
1987 300D 257K (Sold)
1991 300E 108K (Sold)
1987 300E 131K (Sold)
1978 300D TMU (Sold)
1980 300D TMU (Sold)
MBCA Member
Reply With Quote
  #15  
Old 05-31-2002, 08:59 PM
Registered User
 
Join Date: Jul 2001
Location: Motor City. MI
Posts: 73
injector cleaner

have not tried BG product, but do use Redline Si-1 on a regular basis in my own & cust. cars. can honestly say i've seen results.
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 08:15 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