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 09-03-2002, 02:37 PM
Registered User
 
Join Date: Oct 2001
Location: Colorado
Posts: 35
Unhappy HELP: 190E air-flow meter potentiometer worn...

Hello all,

On both of my high mileage 190E-s 2.3 4V and
16V (both 1986) the potentiometer measuring
the air flow (on the side of the chamber just
below the air filter) is worn: reading are
very erratic.

Can someone tell me what the purpose of these
sensors is:

(1) Do they work to compensate for
air/fuel mixture when accelerator pedal is
suddenly depressed?

(2) Also, how much benefit in peformance/
driveability can I expect after spending
$600+ to replace the assembly. After serveral
inquiries I understand that the potentiometer
only is not available; one needs to buy the whole
housing and that is why it costs so much.

(3) Is there an after-market replacement for
the sensor only? Or, is there a shop that would
do it?

Any info greatly appreciated.
TIA,
Tony Ander
PS: Any sources in Germany??? I will be there for
a week later this month...
Reply With Quote
  #2  
Old 09-03-2002, 06:43 PM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Works all of the time! reporting info to computer of the "air flow position". This helps the computer to richen the mixture durning acceleration & leaning the mixture for emissions all of the rest of the time.

Will cause IDLE & acceleration problems!
Replacement WON'T help the engine to produce more HP at all.

MB part number is 000-074-23-14.
Bosch number is 0 438 121 044.
I would replace the rubber pleminum boot that mounts to it as well, MB number 103-141-00-90
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 09-03-2002, 08:26 PM
Registered User
 
Join Date: Oct 2001
Location: Colorado
Posts: 35
Thanks MBDoc!

Thanks so much for the quick reply as
well as the part numbers.

May I follow up with some more questions:

Can you please check the part no. for the
same air flow sensor for my other car,
which is also a 1986 but 4V 2.3L 190E.

By replacing the part I would expect better
engine response, is this correct (no, no
HP increase, I realize.)

Also, could you recommend a Bosch outfit
for these parts? I am really shocked and
reluctant to pay so much money for such
to replace the whole assembly, when only
a "small" part is worn.

Again, thanks so much for your help!
Really great forum and members.

Tony Ander
aander@newsignal.com
Reply With Quote
  #4  
Old 09-04-2002, 10:12 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
On the 1986 car you can replace JUST the sensor! MB part number 000-074-01-36. Easy to replace but can be a job to calibrate to fuel system.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #5  
Old 09-04-2002, 05:32 PM
Registered User
 
Join Date: Oct 2001
Location: Colorado
Posts: 35
Thanks MBDoc, here are the pn-s I found...

Thanks MBDoc,

For everyones benefit (I hope) here are the numbers I found
by actually reading them off the parts in-situ:

1986 190E 2.3 - 16
-----------------------------
pn. of intake assembly (with the flap and potentiometer on the
side)
Bosch 0438 121 044

pn for potentiometer only (black plastic enclosure)
3 430 591 017


1986 190E 2.3 - 8 valve
-----------------------------
pn. of intake assembly
Bosch 0438 121 010

pn for potentiometer only (black plastic enclosure)
3 430 591 031

===============

MBDoc, how hard it is to calibrate this thing? Wouldn't it
just be a matter of measuring closed and open potentiometer
readings and adjusting the potentiometer position on the
side of the housing?

Is anyone out there doing this? It should be a common problem
with high-mileage cars, as these thnings wear out, so, I would
think there is a market (need) for this service. It sure would
beat the $600 for a new assembly...

Thanks to all for a great site!!!

Tony Ander
aander@newsignal.com
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 09:42 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