280se 4.5 D-jet expert needed - Page 2 - Mercedes-Benz Forum

Reply
 
LinkBack Thread Tools Display Modes
post #11 of 12 (permalink) Old 12-22-2013, 06:33 PM
BenzWorld Extremist
 
Date registered: Sep 2012
Vehicle: 300sel W109, 280S 70 , 220s 62. 230 66. Lancia Flavia 63.Pininfarina
Location: Totteridge London.
Posts: 811
Mentioned: 0 Post(s)
Quoted: 59 Post(s)
Thanks for the update.
Was it the injectors that were causing the running faults ?
Ad.
adler is offline  
Sponsored Links
Advertisement
 
post #12 of 12 (permalink) Old 12-22-2013, 06:56 PM Thread Starter
BenzWorld Newbie
 
Date registered: Dec 2013
Vehicle: 1973 280sel 4.5
Location: Atlanta
Posts: 3
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
Yes. Here is the full sequence of problems/resolutions.

Hard to start, missing at idle and running very rich at idle. Idle screw and adjustment on ecu had no effect. Ran okay off idle, but still seemed a little rich (observed black smoke out of tailpipe).

Checked fuel pressure and it was pegged at 90 psi. Discovered blocked return line from regulator. With pressure at 30 psi car would not run at all. Cranked pressure up to 50-60 psi and it ran, poorly, as through it were starving for fuel.

Sprayed ether around intake and discovered several vacuum leaks (the seals between the upper and lower intake were badly cracked).

Pulled the intake and replaced the seals and gaskets. Still wouldn't run without forcing it to run rich (disconnecting temp sensors and cranking up fuel pressure).

Tested injectors -- flow rate and spray pattern was suspect. Perhaps the ravages of time and high pressure damaged them? $700 later (thanks worldpac same day delivery) and it was running like a top. So there were several issues to unravel, but new injectors were, indeed, the final piece.
ebatl is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > General Mercedes-Benz Forums > Vintage Mercedes-Benz

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome