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
  #16  
Old 07-11-2002, 03:21 PM
dpetryk's Avatar
Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,072
My hat is off for you Steve. Persistance pays off as personal satisfaction and lot usually in the wallet.

I am curious as to the cause of the short. Was it a wire that was chaffed or something?

__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
Reply With Quote
  #17  
Old 07-11-2002, 03:32 PM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
Is the valve supposed to click back and forth with the ignition on and the engine not runnig? As in after it chokes down.
Reply With Quote
  #18  
Old 07-11-2002, 06:02 PM
Moderator
 
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,538
I enjoyed your story very much Steve, although it was waaaaay over my head.

Reading your post reminds me of how little I know.

I'm just a simple shade tree mechanic who can replace parts that are obviously broken, but can't really diagnose.

I'm also amazed that after 20 + years there are still things left to learn.
__________________
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
  #19  
Old 07-11-2002, 06:21 PM
engatwork's Avatar
Registered User
 
Join Date: May 2000
Location: Soperton, Ga. USA
Posts: 13,647
Don't it make you feel good when you resolve an issue like this Steve. Thanks for the detailed explanation.

OT - Suginami - now ask him about microbiological corrosion in the heat effected zones of stainless steel piping in river water service - jk.
__________________
Jim
Reply With Quote
  #20  
Old 07-11-2002, 10:38 PM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
Well, I guess my question about the clicking sound is over everybodys head!!
Reply With Quote
  #21  
Old 07-11-2002, 11:37 PM
Registered User
 
Join Date: May 2000
Posts: 376
Stephen,

I have never heard my idle valve make a clicking open/close sound while its running. I would look for a short or a ground problem. It does not sound normal to be.

What does it do when it makes the clicking noises? Idle should increase if an open curcuit occurs, as if it is unplugged. You could put a volt meter on it and watch what it does when it has an episode.

Tinker
Reply With Quote
  #22  
Old 07-11-2002, 11:58 PM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
Engine idle surges up and down, I think it's going into "limp" mode. Eventually it will die. Right after that you can hear the valve "clicking". I think it was clicking during the surging but you couldn't hear it for the engine running. I'm wondering if that's my problem, this valve is opening and closing or "locking up" somehow. I just wonder is it normal. I guess to find out, I'll have to find a like car, kill the engine by unplugging the EZL while running, and listen.
Reply With Quote
  #23  
Old 07-12-2002, 12:34 AM
Registered User
 
Join Date: May 2000
Posts: 376
Cap,

Throttle valve and decel switches are making contact at idle? Any vacuum leaks?

Tinker
Reply With Quote
  #24  
Old 07-12-2002, 09:08 AM
dpetryk's Avatar
Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,072
Stephen, mine just buzzes when the engine runs. You can feel it and hear it. No clicking that I recall. But then again I am in the drivers seat when starting and stopping the engine and I wouldnt hear it if it did.
__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
Reply With Quote
  #25  
Old 07-12-2002, 10:18 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
When the car is running (idle) the rpm will suddenly jump and the thottle plate will open more. Then it will slow back down and, of course, the throttle plate comes back up. This may go on for the entire time the car is running, or, if the check engine light comes on it stops this. If it chokes down, as it eventially will, the idle valve strats clicking in no particular rhythm. Sometimes just before the engine dies it will act as if it's gasping for air, with the throttle plate jumping up and down rapidly.
Reply With Quote
  #26  
Old 07-12-2002, 10:38 AM
dpetryk's Avatar
Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,072
I am sure your problem is related to mixture control. Sounds like the mixture is changing for some reason and the idle control is attempting to hold the RPM constant until it is unable to do so and then it dies. The idle control valve will chatter when it reaches it mechanical limits of travel on the plunger. Maybe thats is what you are hearing. I would look for problems elsewhere, not in the idle control system.

Could be the Lambda system or the EHA or something in the fuel delivery system - pumps, filters etc.
__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
Reply With Quote
  #27  
Old 07-12-2002, 10:48 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
Already replaced pumps and filter along with the afore mentioned electronics.
Reply With Quote
  #28  
Old 07-12-2002, 10:52 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I presume that by throttle plate you are really referring to the airflow plate; major difference. The throttle plate does not move at idle on cars with idle valves.

What you are seeing is the airflow plate deflecting in relation to the amount of air passing through. We will not be able to process the test info if all it contains is descriptions of noise. This does not approach test technique.

If you wish to view the problem you must use the right senses. Hearing is not the one. You need to visualize whats happening by viewing what happens under the terms confronting you.

Your valve is moved by a pulse width modulated signal. You need to use a pulse width modulated signal viewer. What ever it takes. The ears won't do it.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #29  
Old 07-12-2002, 11:27 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
My question was very simple. Is the valve supposed to click when the ignition is on or not?
Reply With Quote
  #30  
Old 07-12-2002, 02:22 PM
dpetryk's Avatar
Electrons can do anything
 
Join Date: Sep 2001
Location: Houston, Texas
Posts: 1,072
No.

__________________
I got too many cars!! Insurance eats me alive. Dave

78 Corvette Stingray - 3k
82 242 Turbo Volvo - Manual - 270k
86 300e 5 speed manual - 210k
87 420sel - 240k
89 560sl - 78k
91 420sel - 205k
91 560sel - 85k
94 GMC Suburban - 90k
97 Harley Davidson Heritage Softail - 25k
00 GMC Silverado 1 ton 30k
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 08:26 AM.


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