No start after filter replacement fuel distributor - Page 19 - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #181 of 186 (permalink) Old 04-27-2019, 12:04 AM
BenzWorld Senior Member
 
miko1aj's Avatar
 
Date registered: Sep 2012
Vehicle: '79 450SL, '04 CLK200 convertible; former A124, W210, A209.
Location: Galway, Ireland
Posts: 513
Mentioned: 4 Post(s)
Quoted: 100 Post(s)
Garage
Same here, absolutely one of the best threads - and I don't even have a KEjet! 😂
H.D. and Bauk18 like this.
miko1aj is offline  
Sponsored Links
Advertisement
 
post #182 of 186 (permalink) Old 04-29-2019, 05:16 AM Thread Starter
Lifetime Premium Member
 
Bauk18's Avatar
 
Date registered: Apr 2017
Vehicle: 560SL 1986 244k miles astral grey / black
Location: Paris, France
Posts: 324
Mentioned: 2 Post(s)
Quoted: 99 Post(s)
Lifetime Premium Member
Garage
(Thread Starter)
@miko1aj & @luckymike Many thanks for the support!!

Quote:
Originally Posted by H.D. View Post
Without going into too much detail , the acceleration enrichment works like this:
When the throttle valve abruptly opens to a significant degree, the AFM plate abruptly jumps down to a significant degree. The AFM potentiometer informs the CIS-ECU about that. The CIS-ECU, knowing (respectively in the test “thinking“) that the engine temperature is 20°C, reacts by sending a current of at least 20 mA (depending on the abruptness of the acceleration) in positive direction through the EHA‘s coil. That moves the EHA‘s baffle plate (depending on the amperage) closer to the EHA‘s inlet nozzle. That reduces the fuel flow through the EHA. That decreases LCP (significantly). That increases the pressure difference between LCP & UCP. That decreases UCP (slightly), thus increasing the difference between UCP (on one side of the metering slits) & SP (on the other side of the metering slits). And that is what causes increased fuel flow through the FD‘s metering slits and, consequently, to the injectors.
@H.D. This is a real brain cracker and more difficult to understand then the French tax declaration I filled this weekend...

Anyhow, whilst performing the TPS tests specified in the FSM I ran into difficulties with the wire test between ECU < -- > Idle control module (N8) < -- > TPS connector (S29/2x). The idle control module is a PIA the reach anyhow, but how to reach it with a MM? Anyone a clever idea? Can the socket were the ICM sits in be declipped?

THXB
Attached Thumbnails
Click image for larger version

Name:	IMG_9393.jpg
Views:	8
Size:	61.3 KB
ID:	2508416  

How hard can it be?
Bauk18 is offline  
post #183 of 186 (permalink) Old 05-01-2019, 03:19 AM
Lifetime Premium Member
 
jaymaynard's Avatar
 
Date registered: Mar 2013
Vehicle: 2015 ML250 Bluetec, 57K miles; 1987 560SL, 121K miles
Location: Fairmont, Minnesota, USA
Posts: 3,491
Mentioned: 9 Post(s)
Quoted: 702 Post(s)
Lifetime Premium Member
I'm loving this thread too, and I do have a KE-Jet...the car runs great is it is, but I find myself wondering if I need to run some basic checkouts, just to make sure it's doing right.

"Engineered like no other car in the world." That's both a bug and a feature.
jaymaynard is offline  
Sponsored Links
Advertisement
 
post #184 of 186 (permalink) Old 05-02-2019, 03:42 AM
BenzWorld Veteran
 
Date registered: Apr 2007
Vehicle: 300sl 1987
Location: Barcelona/Tarragona
Posts: 731
Mentioned: 3 Post(s)
Quoted: 35 Post(s)
^Yeah. After 35-ish years I am sure a sanity check is due. But I don't know where to start and through a 'safe' path that will be conservative rather than big-bang, to avoid getting myself in a mess I can't solve and loose the car...

107's wiki:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Looking for original backseats + their hardware.
bereng is offline  
post #185 of 186 (permalink) Old 05-02-2019, 12:32 PM
Outstanding Contributor
 
H.D.'s Avatar
 
Date registered: May 2014
Vehicle: 1988 300CE
Location: Germany
Posts: 1,313
Mentioned: 33 Post(s)
Quoted: 509 Post(s)
@Bauk18:
If I would not have logged in, I would not have found out about your & the other member‘s new posts. Until the forum is repaired & works properly again for not logged in visitors, please send me notifications about new posts to the private email address I sent you via PM. With only sporadically receiving email notifications from BW, I may not notice otherwise. …
Quote:
Originally Posted by Bauk18 View Post
@... H.D. This is a real brain cracker and more difficult to understand then the French tax declaration I filled this weekend... ...
If you track what I said in post 179 on a sectional drawing of the KE-Jetronic‘s FD you‘ll realize:
  • that it‘s actually easier to understand than a tax declaration.
  • that the pressure difference between the variable UCP (Upper Chamber Pressure) on one side and the constant SP (System Pressure) on the other side of the FD‘s metering slits is the key to understanding the E‘s part (!) of the KE-Jetronic‘s air/fuel mixture control in general (not only for acceleration enrichment). That pressure difference is indirectly controlled by the volume flow through the EHA, which directly controls the difference between LCP (Lower Chamber Pressure) & UCP.
  • and that, no matter how often you hear or read about “checking the upper chamber pressure“ on CIS-E cars, the upper chamber pressure can not be checked. … (see what I said about that in post 12 of this thread: https://www.benzworld.org/forums/w12...l#post17551181)


@jaymaynard & @bereng:
Quote:
Originally Posted by jaymaynard View Post
... I find myself wondering if I need to run some basic checkouts, just to make sure it's doing right.
That‘s especially recommendable if the Lambda adjustment screw has been tinkered with or if you don‘t known whether it has been tinkered with or in what direction & how far it has been turned, respectively what the duty cycle was before it was turned.

See what I said in post 8 of this thread: https://www.benzworld.org/forums/r-c...uty-cycle.html

The least that should be (frequently) done anyway, but is inexplicably often ignored, is to check the duty cycle … (under the conditions mentioned in that same post). … Further tests depend on the results of that duty cycle check.

H.D.

P.S.: In order to keep this thread focused on the OP‘s issues I suggest to post results, if any, in a separate thread.
H.D. is offline  
post #186 of 186 (permalink) Old 05-13-2019, 06:15 AM Thread Starter
Lifetime Premium Member
 
Bauk18's Avatar
 
Date registered: Apr 2017
Vehicle: 560SL 1986 244k miles astral grey / black
Location: Paris, France
Posts: 324
Mentioned: 2 Post(s)
Quoted: 99 Post(s)
Lifetime Premium Member
Garage
(Thread Starter)
To all dear followers,

Just to let you know I haven't given up on my KE. I need Frank to be ready for the weeding of my sister in 4 weeks time so shifted my focus on a few other projects:
- Changed the diff from 2,48 to 2,24 ratio and new seals
- Manifold & area clean + new donuts & gaskets
- Finalised electric cooling fan project
- Installed rear spoiler
- Valve covers in wrinkle red
- Fit bundt style rims
- Install Euro bumpers

The last 3 are in progress. I'll report back here once the above list has been completed and once I have completed a full TPS test.

THXB

How hard can it be?
Bauk18 is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R/C107 SL/SLC Class

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











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