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 05-10-2004, 10:02 PM
zeronero's Avatar
Registered User
 
Join Date: May 2003
Location: San Francisco Bay Area
Posts: 426
My smog test results.

Today I decided to smog my car. I was going to wait until I replaced the O2 sensor but after reading even more posts about them I decided to just go and see what the outcome was.

Well, my car passed, which means that my O2 sensor works so I won't have to worry about that. The only catch was that my gas cap failed so I bought one on the spot and used it to pass. The tech opened a drawer filled with MB gas caps, said that they all fail, that sucks. Here's the results, they seem good, at least I think so

HC CO NO
Test - Max - Ave - Meas - Max - Ave - Meas - Max - Ave - Meas
15 - 105 - 31 - 49 - .69 - .10 - .06 - 757 - 237 - 90
25 - 80 - 20 - 23 - .56 - .09 - .04 - 696 - 199 - 25

Test - %CO2 - %O2
15 - 14.9 - 0.0
25 - 15.0 - 0.0

__________________
1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500
Reply With Quote
  #2  
Old 05-10-2004, 11:31 PM
Registered User
 
Join Date: Mar 2003
Location: Southern California
Posts: 2,272
Probably all you needed was a new fuel cap gasket.

It would help if you stated the year/model/engine.

Duke
Reply With Quote
  #3  
Old 05-11-2004, 12:13 AM
zeronero's Avatar
Registered User
 
Join Date: May 2003
Location: San Francisco Bay Area
Posts: 426
Quote:
Originally posted by Duke2.6

It would help if you stated the year/model/engine.

Duke
HaHa, I seem to always forget that It's a '92 400E

I thought that my gas cap would pass since there's always a loud suction when I remove it to fill the tank, but guess I thought wrong.
__________________
1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500
Reply With Quote
  #4  
Old 05-11-2004, 12:44 AM
Registered User
 
Join Date: Mar 2003
Location: Southern California
Posts: 2,272
Put the year and model in your signature along with that a... phase.

Okay, now on to emission analysis. Your emission control system is working as well as it can as indicated by the zero percent O2. As with most Mercs of this era, the HC is above average for the year group. Many are at the ragged edge of the limit. Also, FWIW, the NOx is commendably low.

The numbers for a 400E probably don't get much better than what yours achieved.

Duke
Reply With Quote
  #5  
Old 05-11-2004, 07:36 AM
MikeTangas's Avatar
Senior Member
 
Join Date: Apr 2000
Location: So. Cal
Posts: 4,430
Zero, or Duke if you know, was the M119 classified as on of the HEP vehicles?
__________________
Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.
Reply With Quote
  #6  
Old 05-11-2004, 11:15 AM
Registered User
 
Join Date: Mar 2003
Location: Southern California
Posts: 2,272
Good question, Mike, I meant to ask it.

zeronero: Look on the top of the report, "Vehicle Information" - last item in the RH column - "Inspection Reason". What does it say?

Duke
Reply With Quote
  #7  
Old 05-11-2004, 09:24 PM
zeronero's Avatar
Registered User
 
Join Date: May 2003
Location: San Francisco Bay Area
Posts: 426
Says "HEP"
__________________
1992 Mercedes-Benz 400E
2002 Mercedes-Benz ML500
Reply With Quote
  #8  
Old 05-11-2004, 10:48 PM
Registered User
 
Join Date: Mar 2003
Location: Southern California
Posts: 2,272
Yeah, that's what I figured. I've been tracking all the emission test posts, particularly in CA. I think ALL the KE equipped engines have been tagged HEP. A continuous flow mechanical FI system, even with the electronic enhancements -O2 sensor and EHA - just doesn't provide good enough fuel control to make low HC numbers and the system is devilishly complicated compared to a pure digital system with solenoid injectors.

In the case of marginal failures there is likely nothing really wrong with the car. The owner just didn't "manage" the test properly. The key is to have the converter as hot as possible so it operates at peak efficiency and uses as much of the available oxygen as possible.

This means going to a drive through place after the car has run for at least 20 minutes, preferably with a freeway jaunt. Go when the line is short and keep the revs at 2000 until the tech is ready to take the car. If possible go on a rainy day and ask them to run the tire dry procedure. They run it on the dyno with no load at about 25 MPH for about a minute. This will heat up the converter. When I did this trick two years ago the HC at 15 MPH dropped to the mid-eightes from barely passing low one hundreds the time before. Since my test is due early in the year, I think I'll keep waiting for a rainy day to test.

Duke
Reply With Quote
  #9  
Old 05-11-2004, 10:58 PM
Registered User
 
Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
Duke 2.6

FWIW, where I live, you don't have to wait for a rainy day.
The test stations run a " conditioning cycle " ( 25 mph for 90 seconds ) & only then proceed with the actual test.
__________________
2007 C 230 Sport.
Reply With Quote
  #10  
Old 05-11-2004, 11:58 PM
Registered User
 
Join Date: Mar 2003
Location: Southern California
Posts: 2,272
Here is CA there are some shops that will do a "pre-test" and I think this includes some "pre-conditioning". I'm not sure of the exact rules that allow this, but, of course, you pay extra for the pre-test.

So far I've not failed just going to a drive through, but I've been a couple of PPM from busting he 15 MPH test.

Duke

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 07:54 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page