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 05-17-2002, 09:49 PM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,745
how to tell if M103 EHA leaks (91 300SE)

I've read about EHA leaks. I checked mine today in the process of investigating a mildly rough idle. It was clean and dry in place. As I loosened the Torx head screws, fuel started to leak from the EHA/distributor interface.

There's a flat head screw on the hidden side of the EHA that I hessitate to touch.

Is there anything I can do that will suggest that it's a good or bad EHA?

Are new o-rings in order? The ones there now are green.

Thanks,
Sixto
91 300SE
87 300SDL
81 300SD
Reply With Quote
  #2  
Old 05-17-2002, 09:52 PM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
I would put it back on and reuse the seals. You can usually tell if you have a leaking EHA by the gas smell.
Don't mess with the screw inside there.
There is an amperage test which can help determine if the EHA is bad or not.
What's wrong with the car?
Gilly
Reply With Quote
  #3  
Old 05-18-2002, 01:17 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: SF Bay Area
Posts: 19,745
Engine is fine except at idle at operating temp. Then it's just rough enough to be annoying but not rough enough to throw money at it. Been this way for the last 15K miles. Dealer did a tune up 10K miles ago and said there's dirt in the fuel distributor. Can it run so smoothly at anything but idle for this to be possible?

Oh, starting is a little difficult. Takes a while to catch, then stumbles for a few seconds before stabilizing. This happens at anything from hours to days after the last run. Warm restarts are usually not a problem.

While I was in the area, I checked the idle switch. Continuity at idle, open off idle.

Thanks,
Sixto
91 300SE
87 300SDL
81 300SD
Reply With Quote
  #4  
Old 05-18-2002, 09:52 PM
Gilly's Avatar
Registered User
 
Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Without knowing more about the history of the car, i would suspect valve stem seals.
"Dirt in the fuel distributor", I like that, I'll keep that one in mind.
Gilly
Reply With Quote
  #5  
Old 05-20-2002, 03:25 PM
Registered User
 
Join Date: Oct 2001
Location: Lancaster, KY
Posts: 5
Sixto - I have the exact same problem as you describe. Mine is on a '89 300TE with only 99,000 miles on it. Been this way since we bought the car at 92K miles. I've tried just about everything to get rid of this "stumble" at start up and when stopped at a stop light. If I shift into Neutral or Park, the oil pressure gage needle goes up by 0.5 bar and this stumble disappears.

Things I've changed:
fuel filter
spark plugs
cap and rotor
cleaned out idle control valve
new OVP relay
put in Lubro/Moly Engine clean - w/o results

I can't say that I don't discount that the valve stem seals are bad but it doesn't smoke at start up and it has this stumble no matter when I start the car. Even if I shut it off and start right away it stumbles for around 2-3 seconds before starting and then once started stumbles another 1-2 seconds before the oil pressure is at 3 bar.

It sounds to me like something that goes to the EZL - either it wouldn't do the same thing when in Neutral or Park.

Now, there was some reference to a screw on the back of the EHA - knowing me, I probably would have turned this screw a little. What does it do and could this be my whole problem?

My independent told me that I needed a whole new fuel distributor (to teh tune of $800) because it was leaking. That's when I started digging myself.

Any help would greatly be appreciated.
Mike
'89 300TE 99K miles
'87 190D 191K miles
'85 190D 2.2L 5-speed 228K miles
__________________
'85 190D 2.2 5-speed
'87 190D 2.5 (non-turbo)
'89 300TE station wagon
Reply With Quote
  #6  
Old 05-21-2002, 01:16 AM
Registered User
 
Join Date: Apr 2000
Location: LEMONT-CHICAGO
Posts: 412
Burgeme, I would try new spark plug wires. My 103 developed a slight miss at idle. Anything above idle is smooth. I couldn't find a vacuum leak. However I know my valve seals are bad. When I stomp on it getting on the highway I sometimes leave a smoke screen bu not all the time. It never smokes at idle or at least not noticeably. A few of my spark plugs were dark and beginning to foul.
__________________
1990 190E 2.6
1996 Grand Voyager 3.3
1985 Mustang GT 5.0 5 SPD
1982 Suzuki GS 750T
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 09:41 AM.


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