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 12-05-2008, 02:14 PM
biobenz617's Avatar
Registered User
 
Join Date: Jan 2006
Location: Denver, CO
Posts: 180
1992 300E Cold Running and Emission Problems

Hey all,

I have a friend at work who has a 1992 300E which has trouble starting when cold and also runs very poorly until up to operating temperature. He also failed emissions with high NOx (7 g/mi over limit of 5), and he had very low CO and HC levels so it's most likely running lean.

Could it be the CIS-E computer is not enabling cold start and cold enrichments and also running the engine lean at op temp? I'm trying to give him some advice where to start. Are trouble codes available from the fuel computer? If so, how do you access them? Does the engine fail lean or rich when the EHA valve is unplugged?

Thanks for the advice

__________________
Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)
Reply With Quote
  #2  
Old 12-05-2008, 02:31 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,108
In my case unplugging the idle control valve solved most of my problem.... Not a recomendation, but probably something worth trying. I still plan on fixing mine properly...eventually.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 83k - mine - (OC-85,500)
'17 Metris(VITO!) - 13k - wifes (OC-17k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'01 E320 - 179k - dad's (OC-182,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 51k - dad's (OC-52,000)
'16 E400 4matic Sedan - 57k - Brothers (OC-64,000)
Reply With Quote
  #3  
Old 12-05-2008, 02:56 PM
biobenz617's Avatar
Registered User
 
Join Date: Jan 2006
Location: Denver, CO
Posts: 180
Quote:
Originally Posted by pawoSD View Post
In my case unplugging the idle control valve solved most of my problem.... Not a recomendation, but probably something worth trying. I still plan on fixing mine properly...eventually.
He says it runs well after warmup, but I'll bet he probably needs to clean the idle valve anyway.
__________________
Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)
Reply With Quote
  #4  
Old 12-05-2008, 05:34 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,108
When I cleaned and reinstalled mine it made my problem worse, it would not idle at all, it just shut off unless you gave it fuel with the pedal.....unplugged it, and problem went away. Weird.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 83k - mine - (OC-85,500)
'17 Metris(VITO!) - 13k - wifes (OC-17k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'01 E320 - 179k - dad's (OC-182,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 51k - dad's (OC-52,000)
'16 E400 4matic Sedan - 57k - Brothers (OC-64,000)
Reply With Quote
  #5  
Old 12-05-2008, 07:15 PM
Registered User
 
Join Date: Jul 2007
Location: USA
Posts: 2,156
For the engine hard to start when cold try this:

test fuel pressure
test coolant temperature sensor
test starting device of KE fuel injection system

For the other problem it could many things causing the rich condition. An cold engine will always run rich not lean. You will have to test the KE injection system and see what it is wrong.
__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
Reply With Quote
  #6  
Old 12-08-2008, 01:08 PM
biobenz617's Avatar
Registered User
 
Join Date: Jan 2006
Location: Denver, CO
Posts: 180
Quote:
Originally Posted by Oracle12345 View Post
An cold engine will always run rich not lean. You will have to test the KE injection system and see what it is wrong.
Not necessarily if there is a problem with the cold enrichment logic either in the computer or the EHA valve. Could possibly be the temp sensor sending false warm temperatures.

Can you test the KE computer for fault codes?
I've told him he needs to run through the basic tests of the system as well (fuel pressures, etc).

Thanks,
__________________
Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)
Reply With Quote
  #7  
Old 12-08-2008, 02:58 PM
pawoSD's Avatar
Dieselsüchtiger
 
Join Date: Oct 2004
Location: Grand Rapids, MI
Posts: 15,108
In my case I ordered a new temp sensor (the 4-pin one) and am going to see if that makes a difference.....it won't be here till the end of the week, but for now the car seems to be running fine without the valve connected....still has tremendous power. Easily pulls to the max of each gear.
__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 83k - mine - (OC-85,500)
'17 Metris(VITO!) - 13k - wifes (OC-17k)
'01 E320 Wagon - 159k - mine (OC-160,000)
'01 E320 - 179k - dad's (OC-182,500)
'07 E350 Wagon - 131k - dad's (OC-132,500)
'01 SL500 - 51k - dad's (OC-52,000)
'16 E400 4matic Sedan - 57k - Brothers (OC-64,000)
Reply With Quote
  #8  
Old 12-08-2008, 03:26 PM
Registered User
 
Join Date: Jul 2007
Location: USA
Posts: 2,156
Quote:
Originally Posted by biobenz617 View Post
Not necessarily if there is a problem with the cold enrichment logic either in the computer or the EHA valve. Could possibly be the temp sensor sending false warm temperatures.

Can you test the KE computer for fault codes?
I've told him he needs to run through the basic tests of the system as well (fuel pressures, etc).

Thanks,
a cold engine will always run rich. Just hook a tool such as the snap on solius or modius and monitor the oxygen sensors if you dont believe me...

a faulty temperature sensor will cause the car to stay in a rich condition.

You can get fault codes from the ke control unit and mas. Search the forums on how to build it.
__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
Reply With Quote
  #9  
Old 12-08-2008, 04:45 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
There is no MAS on a KE-Jetronic car.
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #10  
Old 12-08-2008, 05:08 PM
Registered User
 
Join Date: Jul 2007
Location: USA
Posts: 2,156
Quote:
Originally Posted by babymog View Post
There is no MAS on a KE-Jetronic car.
1990 and on....

not part of the fuel injection directly but affects the fuel injection system greatly
__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
Reply With Quote
  #11  
Old 12-08-2008, 05:53 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
Are you thinking about the airflow meter / airflow sensor? The Mass Air Sensor is a later item, not CIS-E/KE.
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #12  
Old 12-08-2008, 10:22 PM
biobenz617's Avatar
Registered User
 
Join Date: Jan 2006
Location: Denver, CO
Posts: 180
Lambda Fault Codes

From what I've read, my friend needs to check his lambda duty cycle and possibly the LED if his car is from CA. I crawled around and can't find any table of fault codes & duty cycles (on-off ratios). Can someone point me in the right direction? What years of KE gave fault codes in this fashion?

Thanks,

__________________
Dave

2002 Audi S6 Avant
1983 300D
1984 300D (sold)
1990 560SEL (sold)
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 06:03 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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