Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 12-16-2003, 10:59 AM
Registered User
Join Date: Dec 2002
Posts: 75
What size Allen Wrench ?

What is the size of the Allen Wrench used to adjust the screw which is accessed through the hole in the Air Cleaner ? This is for CIS injection systems as in my 84 380SE.

I was having a starting problem where the morning start was great (because Cold Start Valve providing extra fuel). Thereafter, trying to start even after 5 hrs, it used to take 30 turns of the engine to start it. I noticed that the throttle plate was not lifting. I want to try to tweak the CO adjustment screw and see if that makes a difference. Is this the right approach ?


Reply With Quote
Old 12-16-2003, 11:32 AM
Registered User
Join Date: Jul 2001
Location: SoCal
Posts: 1,303
Be careful of confusion due to labelling. The throttle plate is likely not visible. It is hidden well below the airflow meter plate. The throttle plate is connected to the throttle linkage, and can be expected to open when the accelerator is pressed. It is bypassed by the idle control valve, whose opening is controlled by the engine management computer.

The airflow meter plate is not operated by any linkage or computer. It is designed to open as a function of airflow demand - as airflow increased, it is pulled open by the differential air pressure only. It is linked to the fuel distributor, and determines mechanically the fuel mixture.

Now reanalyse what is happening.

'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
Reply With Quote
Old 12-16-2003, 11:38 AM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
Check the condition of the idle control valve hoses before twiddling with the mixture. They are probably rock hard by now, and leaking. This will result in no fuel hot (no cold start valve), and hard starts.

The idle control valve is under the air filter housing, about half the size of a coke can. One electrical connection, two 1/2" or so ID rubber hoses.

1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
Reply With Quote
Old 12-16-2003, 11:51 AM
Gilly's Avatar
Registered User
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Reply With Quote
Old 12-16-2003, 11:55 AM
Registered User
Join Date: Dec 2002
Posts: 75
I apologize. I was refering to the Airflow meter plate. That is not lifting when I am trying to start after say 5 hrs.

As for the idle control valve hoses, if I depress the accelerator while starting, would it not make the malfunctioning idle hoses a moot point ? The car is difficult to start even when I depress the pedal.

Finally, after 5 hrs of sitting there, the engine is not really "hot ".

Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -4. The time now is 07:07 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, 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