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 > Vintage Mercedes Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-29-2021, 03:55 PM
Registered User
 
Join Date: Mar 2021
Posts: 4
W123 with M110 cold start issue

Hi guys, my 280E has a cold start issue whereby it fires but dies a couple of times before finally catching and slowly building up a decent idle.

A mechanic friend has identified a split diaphragm in the part circled in red below, a kind of vacuum valve.

Can anyone tell me the actual name of this part, or a part number, so I can search for a known good one? Thanks.




Sent from my iPhone using Tapatalk

Reply With Quote
  #2  
Old 03-29-2021, 04:30 PM
Registered User
 
Join Date: Feb 2011
Location: Modesto CA
Posts: 3,330
It is a "Decel Circulating Air Valve"
Reply With Quote
  #3  
Old 03-30-2021, 03:29 PM
Registered User
 
Join Date: Mar 2021
Posts: 4
Quote:
Originally Posted by Frank Reiner View Post
It is a "Decel Circulating Air Valve"

Quote:
Originally Posted by Frank Reiner View Post
It is a "Decel Circulating Air Valve"

Hey thanks so much. This enabled me to find the part.


Sent from my iPhone using Tapatalk
Reply With Quote
  #4  
Old 04-08-2021, 01:08 PM
Registered User
 
Join Date: Oct 2012
Posts: 15,897
If replacing that part is not the fix, and it will help but it might not fix it entirely, then move on to the next step.

Try shooting some starter spray into your intake and see if it fires right away. It will then need to idle until it reaches operating temps.

If this works then check out the operation of your warm up regulator. I have had them go bad and this cold start situation is what happens.

Also, if it is your warm up regulator, then you engine will start nicely and run smoothly when it is warm. Just another simple test.
Reply With Quote
  #5  
Old 04-12-2021, 09:09 AM
Registered User
 
Join Date: Mar 2021
Posts: 4
Thanks a lot. We have the warm-up regulator out and ready to send to be tested by someone who has the right bench and testing gear.

One question: aside from the warm-up regulator, does the decel circulating air valve have any role to play in cold start-up issues or is it more likely issues with the auxiliary air valve?

Thanks. I will post updates when we have some success.


Sent from my iPhone using Tapatalk
Reply With Quote
  #6  
Old 04-17-2021, 09:19 PM
Registered User
 
Join Date: Oct 2012
Posts: 15,897
Quote:
Originally Posted by 123&Away View Post
Thanks a lot. We have the warm-up regulator out and ready to send to be tested by someone who has the right bench and testing gear.

One question: aside from the warm-up regulator, does the decel circulating air valve have any role to play in cold start-up issues or is it more likely issues with the auxiliary air valve?

Thanks. I will post updates when we have some success.


Sent from my iPhone using Tapatalk
You can test the warm up regulator by sucking on the vacuum port. If it holds vacuum you are good on that part.

The electrical plug has two poles. Depending on the unit you check for the ohms across the poles. The acceptable range is 20 to 40 ohms. Anything above or below that and the unit is bad.

If the vac holds and the ohms are right then that's all there is to test. If they are not then I am clueless as to how to proceed except to find another one that works or get your rebuilt.

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 05:44 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page