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

 
 
LinkBack Thread Tools Display Modes
Prev Previous Post   Next Post Next
  #1  
Old 11-17-2004, 04:51 PM
Super Moderator
 
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,318
Oxygen Sensor Voltage Question

I recently bought a 1984 280SL road warrior - 181K, sitting for a while due to clutch problems. Plan A was to use the drive train in my 280C. But I have fixed the clutch, and found that this is actually a nice car. Plan B is to make it my driver, so I need to take it in for a smog test next week.

Since this is a euro car, a converter, O2 sensor, computer, and frequency valve have been added. All after market. The sensor was unhooked when I got the car - looked like a rodent chewed through the wire. I tested the voltage, and got a nice fluctuating current around .098v. So I connected the wire and found that the idle smoothed out a bit, but it was pretty good to begin with. The frequency valve also started buzzing.

The sensor is a three-wire model with only the sensor lead connected.

The engine starts instantly, warms up well, goes great, and idles smoothly. If anything, it smells a bit rich when it's hot.

Everything I have read about O2 sensors is that they operate in the .15 - .85 volt range. Is this always true? Or do they come in different voltages and calibrated to the computer/valve? I have had opposing answers from two experienced techs. I am obviously trying to figure out if I have a bad sensor or the engine is running very lean, or if the system is just calibrated differerently and everything is OK.

TIA for any information.
__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
Reply With Quote
 

Bookmarks


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 01:57 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, 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