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 > Vintage Mercedes

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 04-13-2017, 12:24 AM
Registered User
 
Join Date: May 2016
Posts: 4
73 280SE 4.5 high idle

I brought a used 280SE 4.5 about ten years ago and I had the top end reconditioned. It idled high when I brought the car and it still idleds high after the maintenance. The mechanic was adding and removing washers from a valve located in the front of the engine. He mentioned the name of the part, but I was not paying attention. I'm thinking of selling the car and want the new owner to be aware of this condition Can anyone think of what component would cause the engine to idle high or low with this manual adjustments.
Reply With Quote
  #2  
Old 04-13-2017, 09:39 AM
Graham's Avatar
Registered User
 
Join Date: Nov 2004
Location: Ontario, Canada
Posts: 3,110
Quote:
Originally Posted by Ansel Allen View Post
I brought a used 280SE 4.5 about ten years ago and I had the top end reconditioned. It idled high when I brought the car and it still idleds high after the maintenance. The mechanic was adding and removing washers from a valve located in the front of the engine. He mentioned the name of the part, but I was not paying attention. I'm thinking of selling the car and want the new owner to be aware of this condition Can anyone think of what component would cause the engine to idle high or low with this manual adjustments.
It's likely the Auxilliary Air Valve (AAV). It allows additional air during start-up. As engine warms up, it has a thermostatic bulb that causes the valve to close. It should be fully closed at 150degF. These valves are prone to sticking and not closing properly. Putting washers in to limit flow is something some do, but does not fix the problem. The valve either needs to be replaced with new or good used one(new ones are very expensive) or dismantled and repaired. It looks like this when disassembled:
__________________
Graham
85 300D14 GLK250,72 350SL, 98 E320
Reply With Quote
  #3  
Old 04-14-2017, 05:29 PM
Registered User
 
Join Date: May 2016
Posts: 4
Thanks.
Reply With Quote
  #4  
Old 04-14-2017, 06:10 PM
Registered User
 
Join Date: May 2016
Posts: 4
73 280SE 4.5 high idle

I need an Auxiliary Air Valve (AAV) for my 1973 280SE 4.5. Can they be rebuilt? or can they be purchased new thru Mercedes Benz. My car runs O.K. but it always idle high. Does any one have a part number for the AAV.
Reply With Quote
  #5  
Old 04-14-2017, 07:34 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 2,145
AA:

Graham gave you a correct, and very satisfactory, answer in your first thread of the same heading. Suggest you delete this thread, and follow up in the first one.
Reply With Quote
  #6  
Old 04-14-2017, 09:46 PM
Graham's Avatar
Registered User
 
Join Date: Nov 2004
Location: Ontario, Canada
Posts: 3,110
RE part number you asked for in your other thread:

Bosch 0280140017 MB 0001410325

There are repair discussions on Benzworld 107 forums in stickies. Do a search and you will find them. For start wash the valve in solvent then Simple Green or similar and cycle it back & forth with hot/cold water until it it moves and is closed at 150F
__________________
Graham
85 300D14 GLK250,72 350SL, 98 E320
Reply With Quote
  #7  
Old 04-16-2017, 10:11 AM
Registered User
 
Join Date: Aug 2007
Location: Middle Haddam, CT
Posts: 229
A little lubrication of moving parts with WD 40 helps.
__________________
Berfinroy in CT
Present vehicles:
1973 300 SEL 4.5
1959 Rolls Royce Silver Cloud I
Past vehicles;
1958 Bentley S 1
1976 ex-Max Hoffman 6.9
1970 300SEL 2.8
1958 Jaguar MK IX
1961 Jaguar MK IX
1963 Jaguar E-type factory special roadster
1948 Plymouth woody
1955 Morgan plus 4
1966 Shelby GT350H Mustang
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 03:58 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