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 04-11-2002, 05:56 PM
Subman's Avatar
Senior Member
 
Join Date: Apr 2000
Location: South Florida
Posts: 447
Question Weird thortle problem on 94 E420, and loud diff

I have searched the archives and did not find anyone with my problem.

When I start my car and it is cold (not really that cold in Florida) The car will idle at 1000-1250 in park until it is warm, but here is the kicker when the car is in drive it will push the car along at 1000 rpm and it resists when I put the brake on (I have to jam the brake to stop, it feels like some one is pushing on my gas pedal, or it feels like I am doing a brake stand). Now for the really strange part, this happens when in Neutral when moving (no feet on the pedals), but as soon as I stop the car the rpms go down to normal (500-700), this will keep on happening until the motor becomes warm and then it will not happen any more.

I did find a few things that may be my problem, but I do not know.
1. Dirty throttle body
2. Bad wiring harness
3. Bad throttle valve actuator (I hope not $$$$)

I don't know if this is normal either but I will ask anyway, I was on the highway and came to a stop at a light and the car would idle very high (about 1500) when in neutral, and would want to push me along in drive. The temp was quite high 100-105 (engine)
Is this normal?

My third problem is that my diff gets quite loud, at speed over 45 you can here it wine and it gets annoying. I did some searching on this and found that most people put Red Line racing synthetic fluid and the wine was reduced.
The diff also makes a clunking sound when the gas is pushed hard at certain speeds (mostly low speeds), it kind of feels like some one just kicked the back of the car (I know this is not good). I found that this could be because the ring and pinion gears are out of wack, but I don't know. I would not be that mad if my diff went then I could get a 2.82

Ok so dose anyone know why my car idles so weird when cold?
Why the idle goes up when the car is hot?
And why my diff is loud and clunky?

Thanks a bunch
Subman
__________________
Factory trained Mercedes-Benz Technician
Look At My Website
-2002 C32
(E420 has passed away)
The best way to contat me is e-mail.

Reply With Quote
  #2  
Old 04-11-2002, 09:52 PM
Senior Member
 
Join Date: Apr 2001
Location: Baton Rouge
Posts: 485
Ok so you have a bad wiring harness on the engine right? As for the idle problem I would suspect a bad Electronic accelerator, Idle speed control and cruise control unit . which is the throttle valve .
All of these controls are built into the throttle assy. The harness on the throttle valve do cause problems ( I have about 10 on display in the shop ) . What I would first do is have the codes pulled from the diagnostic module and the ea,isc,cc module also. As for the noise in the rear end well if the vacuum and control pressure is off for the transmission it will cause a clunk on downshift, also a bad flex disc or worn rear differential bushingswill cause noise also. I have seen alot of things cause noises in rear ends when coming to a stop. Basically you need to find a dependable shop who has a good reputation and experience on Mercedes. Good luck,
__________________
euro 287
Mercedes Technician 7 Years (retired to Hyundai)
2000 Dodge Durango
98 Mazda truck
Reply With Quote
  #3  
Old 04-11-2002, 10:18 PM
Subman's Avatar
Senior Member
 
Join Date: Apr 2000
Location: South Florida
Posts: 447
I did not say that my harness was bad but I will check it out, some of the wiring lumes have crumbled in my hand but that is about it.
The noise from the rear end happens at higher speeds and the clunk happens when I go aout 5 mph and hit the gas to acclerate. Thanks for the advice and I will check out the things you said.
Subman
__________________
Factory trained Mercedes-Benz Technician
Look At My Website
-2002 C32
(E420 has passed away)
The best way to contat me is e-mail.

Reply With Quote
  #4  
Old 04-11-2002, 10:46 PM
Registered User
 
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Subman,
I too have a downshift "clunk." Mine happens at around 20 mph, like when coasting to a stop light which is red but turns green before you actually stop. If you give it any amount of throttle, the downshift (3-2?) is very pronounced. Somewhere in the archives is my post on this; I was told it was due to a bad B1 piston. I haven't done anything about it, just try to avoid hitting the accelerator too hard at that speed.

I agree with Euro -- I'd get the codes pulled, either by a good independent with a handheld scanner or (gulp!) at the dealer. Paying someone who knows the M119 engine for an hour or two of diagnostic time would be money very well spent.
__________________
Steve
'93 400E
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 07:01 AM.


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