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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-25-2003, 12:05 AM
Registered User
 
Join Date: Mar 2003
Location: Carmel, CA
Posts: 301
E420 Engine Surging

Anyone have an idea why my idle has dropped (500 rpm) and engine surges occassionally on my E420??
__________________
1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500
Reply With Quote
  #2  
Old 03-25-2003, 09:15 PM
Moderator
 
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
vacuum leak?

bad mass air sensor?
__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
Reply With Quote
  #3  
Old 04-06-2003, 01:03 AM
Registered User
 
Join Date: Mar 2003
Location: Carmel, CA
Posts: 301
Where is the air mass sensor located and how can it be changed and/or diagnosed??
__________________
1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500
Reply With Quote
  #4  
Old 04-06-2003, 02:32 PM
Moderator
 
Join Date: Dec 2001
Location: Southern California, U.S.A.
Posts: 8,508
The mass air sensor is located in the big, fat plastic tube that is located between the box that holds your air filter and the intake manifold.

It is held in by simple hose clamps, and takes 10 minutes to replace.
__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
Reply With Quote
  #5  
Old 04-23-2003, 03:33 PM
Registered User
 
Join Date: Mar 2003
Location: Carmel, CA
Posts: 301
Is it that small thing near the head light in the air intake hose on the left side of the car???? Need more detail as to wear it is?
__________________
1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500
Reply With Quote
  #6  
Old 04-23-2003, 10:02 PM
Registered User
 
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Allan,
The small thing in the left side air tube is the ambient air temperature sensor.

On our M119 engines, I believe the air mass sensor is actually in the throttle body. If you take off the air cleaner you'll see a thin platinum wire in the throttle bore which is the air sensor.

Have you tried some Techron and a good old fashioned Italian tune up?
__________________
Steve
'93 400E
Reply With Quote
  #7  
Old 04-23-2003, 10:05 PM
Registered User
 
Join Date: Mar 2003
Location: Carmel, CA
Posts: 301
What the heck is an Italian tune up...LOL????

If I replace the sensor is there anything that needs to be reset to tell the computer/sensors it's been fixed?
__________________
1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500
Reply With Quote
  #8  
Old 04-23-2003, 10:12 PM
Registered User
 
Join Date: Jun 2001
Location: Omaha, NE
Posts: 962
Ah, yes, the famed Italian tune up. There was recently a thread about whether this term is an affectionate reference to a time-honored tradition, or an insult. I hope it's the former.

In any event, many, many died in the wool MB fans have told me that these engines really benefit from some occasional flogging. The idea is to find a safe, hilly area and once a week or so give your engine a couple of wide open throttle (WOT) experiences for several seconds. You'll see the tach go to redline (6000 RPM) and you'll almost lose your nerve, but be strong and persevere, and good things will come. If you have carbon buildup, the first couple times you do this you'll think you've ruined your engine since it will buck and snort when it hits about 5500 RPM. But, again, be strong, keep it up, and before you know it, she'll be purring like a kitten. This did happen to me, but fortunately Stu Ritter had said what I just said about not getting shook up about the bucking and snorting ...

Some have even reported transient electrical glitches seem to improve after an ITU!
__________________
Steve
'93 400E
Reply With Quote
  #9  
Old 05-06-2003, 01:24 AM
Dcraig's Avatar
Registered User
 
Join Date: Sep 2001
Location: So. CA. USA
Posts: 697
I just found this thread.

My E420 will also occasionally surge in rpm's. Mostly when almost comming to a full stop, it will surge for about 1 second.

Could that be the mass air sensor?

Craig
__________________
1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.
Reply With Quote
  #10  
Old 05-06-2003, 10:14 AM
Registered User
 
Join Date: Mar 2003
Location: Carmel, CA
Posts: 301
Let me know if you find out why yours is surging. I have the same car same year and have the same problem. I just replaced the wiring harness as these were a source of problems for our E420's. Having done that (and after $700.00) it is still surging. What is very strange is there are no error code showing up so myself AND my machanic are both stumped. ANYONE EXPERIENCED THIS BEFORE?? HELP!!!
__________________
1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500
Reply With Quote
  #11  
Old 05-06-2003, 10:27 AM
Registered User
 
Join Date: Jul 2002
Location: Dallas
Posts: 330
Does a E420 have the resistor ends on the coil wires like my E320? I had low idle/surging problems and changing the resistor ends cured the problem. That and assuring the plugs were the correct, non-resistor Bosch's.
Reply With Quote
  #12  
Old 05-06-2003, 10:31 AM
Registered User
 
Join Date: Mar 2003
Location: Carmel, CA
Posts: 301
Great question!! I don't know. Does anyone in here know?
__________________
1973 280 - Sold
1980 300SD - Sold
1982 240D - Stolen
1988 300E - Sold
1989 260E - Sold
1989 560SEL
1994 E420 - Sold
1997 E420
2005 CL500
Reply With Quote
  #13  
Old 05-06-2003, 11:33 AM
Dcraig's Avatar
Registered User
 
Join Date: Sep 2001
Location: So. CA. USA
Posts: 697
I don't know why, I was thinking of that air mass sensor. I've only had my E for 1 1/2 years. I bought it from a MB dealer and they replaced the wiring harness, plugs, caps, etc. A total of $3200 in work. Doesn't do it all the time, just every once and a while.

Craig
__________________
1994 E420, Pearl Black/Black. 2.82 rear diff., AMG front spoiler, painted lower half. SOLD

1972 & 1974 BMW 2002tii's.
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 12:53 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page