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 > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 06-16-2003, 10:29 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
Duty cycle/EHA current , 2 pictures from meters

Top meter is EHA current and red meter is duty cycle. Duty cycle was jumping between 78 and 94%.

Attached Thumbnails
Duty cycle/EHA current , 2 pictures from meters-duty1.jpg  
Reply With Quote
  #2  
Old 06-16-2003, 10:30 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
This is with the o2 sensor unplugged. Any one know what this means?
Attached Thumbnails
Duty cycle/EHA current , 2 pictures from meters-duty2.jpg  

Last edited by Cap'n Carageous; 06-16-2003 at 10:47 AM.
Reply With Quote
  #3  
Old 06-16-2003, 11:10 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
Your camera needs new batteries because it's taking too long for the flash to charge? Just kidding

Sixto
95 S420
91 300SE
87 300SDL
83 300SD
Reply With Quote
  #4  
Old 06-16-2003, 11:13 AM
Registered User
 
Join Date: Jul 2001
Location: SoCal
Posts: 1,303
What car? Is this at idle, and if so, was the idle speed steady and what was the rpm?

Steve
Reply With Quote
  #5  
Old 06-16-2003, 11:16 AM
Registered User
 
Join Date: Nov 2002
Location: florida
Posts: 83
well the eha is reading a rich reading while the other is reading lean what i did was adjust the mixture screw to maiting a little rich reading at idle and at 2000rpm the other meter to read no more than65% you will notice taking impresive throttle respond no more lagging taking off
Reply With Quote
  #6  
Old 06-16-2003, 11:19 AM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
89 3ooe M103 @ 2000 RPM (same readings at idle). I adjusted the mixture screw until it killed the engine, but it didn't change the readings.
Reply With Quote
  #7  
Old 06-16-2003, 11:25 AM
Registered User
 
Join Date: Nov 2002
Location: florida
Posts: 83
i re read the post you said 02 disconnected if so then it should of went to 50% and eha to lean
Reply With Quote
  #8  
Old 06-16-2003, 11:35 AM
mike690003's Avatar
Registered User
 
Join Date: Apr 2003
Location: Miami,FL
Posts: 807
I want one of those multimeter units,but I do not have the slightest idea how to use one. Are they that complicated to use??
__________________
1987 mercedes 300E
1995 e320 conversion(hated the 300e grill)
HID/Xenon (D2S)
Keyless Entry
Monochromatic Paint (Custom Blue)
Smoked Tails
Flat Badged (front)
Debadged (rear)
custom "carbon fiber" console
18 inch HP EVO rims
Sold! Now I drive a Monte Carlo SS
http://memimage.cardomain.net/member.../352975_67.jpg
http://memimage.cardomain.net/member.../748335_24.jpg
Reply With Quote
  #9  
Old 06-16-2003, 11:43 AM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
I can't read the second picture, but if the O2 sensor is disconnected the eHA should go to 0.0ma and the duty-cycle to 50%.

The first picture denotes a rich mixture from the EHA current of minus 3ma. The duty-cycle is backwards or the polarity is backwards. A 68%duty-cycle would indicate a lean mixture.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #10  
Old 06-16-2003, 12:23 PM
Registered User
 
Join Date: Nov 2002
Location: florida
Posts: 83
The first picture denotes a rich mixture from the EHA current of minus 3ma. The duty-cycle is backwards or the polarity is backwards. A 68%duty-cycle would indicate a lean mixture.

steve is this normal my car shows. it that way too
rich reading at eha and lean on dutycycle
Reply With Quote
  #11  
Old 06-16-2003, 12:41 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Duty cycle represents a point of view. Sixty-eight percent on duty cycle is the same as 32% off duty-cycle. Most meters have switches that invert the readings. If the EHA is right (the way to tell this is the key on engine off current. it will always be positive) then the duty cycle should be reversed for convention.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #12  
Old 06-16-2003, 01:00 PM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
I turned the camera flash off for the second picture, should've left it on! The meter readings for the second picture are almost identical to the first. So, no change when o2 sensor was unplugged. As I said, the duty cycle bounced from 94 to 78, actually spending more time at 94%. So, if it's that lean where's the gas going? 12 miles per gallon. Cold start injector is plugged off. EHA (or anthing else for that matter) is not leaking externally.
Reply With Quote
  #13  
Old 06-16-2003, 01:14 PM
Registered User
 
Join Date: Aug 2002
Location: Central Asia
Posts: 104
Cap'n,
are you sure that you disconnected the 02 sensor?
You might have disconnected the heater wire or some other thing but not the 02 sensor.
__________________
1989 230E, 8v, 166.000 km, updated to 94/95 trunk & hood
2002 Daewoo Nexia 50.000 km
Sold:
1987 VW Jetta GLE 16V, Recaro seats
1982 Volvo 240 DL (lovely car!)
and few more american cars.
Reply With Quote
  #14  
Old 06-16-2003, 01:49 PM
Registered User
 
Join Date: Aug 2001
Location: secret
Posts: 3,044
I disconnected both the heater and the sensor.
Reply With Quote
  #15  
Old 06-16-2003, 03:06 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
All that matters is the EHA current. The duty-cycle is only an easy way to see a similar representation of closed loop control.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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 03:05 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page