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 02-24-2009, 07:56 PM
socaleuro's Avatar
Your Polishing Pal!
 
Join Date: Sep 2008
Location: Los Angeles, CA
Posts: 71
'Adjusted' lambda tower screw...car won't start.

I will make this very brief...

I messed with the Lambda tower adjustment (trying to lean out mixture) and now the car won't start. I went to the max counterclockwise and even clockwise (I think it maxed CW). Messed with it some more and to no success. Then pulled spark plugs to check for flooding, rich smell was present, but then again the car has always ran rich. At this point I am going to let the car sit for several hours in case it is flooded.

Now...I am pretty much screwed since the car must be running in order to set the lambda tower adjustment (found a post on here about that) or, is it absolutely going to the indy?

Thanks in advance everybody!

Edit: Car is a '89 300E


Last edited by socaleuro; 03-02-2009 at 10:39 PM.
Reply With Quote
  #2  
Old 02-24-2009, 08:18 PM
slk230red's Avatar
WECO Installer
 
Join Date: Jul 2006
Location: Tampa, FL
Posts: 820
Quote:
Originally Posted by socaleuro View Post
I will make this very brief...

I messed with the Lambda tower adjustment (trying to lean out mixture) and now the car won't start. I went to the max counterclockwise and even clockwise (I think it maxed CW). Messed with it some more and to no success. Then pulled spark plugs to check for flooding, rich smell was present, but then again the car has always ran rich. At this point I am going to let the car sit for several hours in case it is flooded.

Now...I am pretty much screwed since the car must be running in order to set the lambda tower adjustment (found a post on here about that) or, is it absolutely going to the indy?

Thanks in advance everybody!

Edit: Car is a '89 300E
I assume you were adjusting it while it was running, right? If so, then it would have started to stall either way, going CW or CCW.
When adjusting the Duty Cycle, you need to turn the adjustment very slowly until the correct measurement is reached.

Just curious, how could you reach max. adjustment?
__________________

1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
Reply With Quote
  #3  
Old 02-24-2009, 08:47 PM
Registered User
 
Join Date: Apr 2005
Posts: 47
Well you can't just go from max to max. Try taking it all the way lean and then richening it one full turn at a time until it starts. Then, once it's warmed up, make your fine tuning adjustments while the car is running.
Reply With Quote
  #4  
Old 02-24-2009, 08:55 PM
socaleuro's Avatar
Your Polishing Pal!
 
Join Date: Sep 2008
Location: Los Angeles, CA
Posts: 71
Quote:
Originally Posted by marlinspike View Post
Well you can't just go from max to max. Try taking it all the way lean and then richening it one full turn at a time until it starts. Then, once it's warmed up, make your fine tuning adjustments while the car is running.


Right. What I mean is that I turned counterclockwise until I couldn't turn anymore and the same going clockwise.

Ok, just to be triple sure, counterclockwise is LEAN, correct?

I will try your suggestion out marlinspike!

Thanks you guys! Keep 'em coming!
Reply With Quote
  #5  
Old 02-24-2009, 09:33 PM
babymog's Avatar
Loose Cannon - No Balls
 
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,765
It is possible that while adjusting, you forced the airflow plate down and it is binding/dragging. This might also be the cause of your rich idle, the plate might not be returning to rest.

Get down to the airflow meter, lift the plate gently and check for free-smooth movement. If the plate is dragging on the sides of the opening, you will need to loosen the screw in the center of the plate and re-center the plate.

Don't get too rough with loosening/tightening the screw.

The plate should also be within the narrow part of the opening when at rest, that adjustment involves bending the clip on the spring IIRC. It is all outlined in the FSM.
__________________

Gone to the dark side

- Jeff
Reply With Quote
  #6  
Old 02-24-2009, 10:01 PM
Registered User
 
Join Date: Apr 2005
Posts: 47
Quote:
Originally Posted by socaleuro View Post
Right. What I mean is that I turned counterclockwise until I couldn't turn anymore and the same going clockwise.

Ok, just to be triple sure, counterclockwise is LEAN, correct?

I will try your suggestion out marlinspike!

Thanks you guys! Keep 'em coming!
Yep, counterclockwise is lean. There's probably no point in going all the way lean, just a waste of your time, I guess start off one full 360 rotation towards the rich side from max lean.
Reply With Quote
  #7  
Old 02-25-2009, 01:58 AM
socaleuro's Avatar
Your Polishing Pal!
 
Join Date: Sep 2008
Location: Los Angeles, CA
Posts: 71
Quote:
Originally Posted by marlinspike View Post
Yep, counterclockwise is lean. There's probably no point in going all the way lean, just a waste of your time, I guess start off one full 360 rotation towards the rich side from max lean.

Sounds good.... How 'sensitive' is the adjustment? Are we talking about 1/16th of a turn can mean the diffrence in a running / non-running engine or would taking it in 360 turns be ok?
Reply With Quote
  #8  
Old 02-25-2009, 08:59 AM
Registered User
 
Join Date: Apr 2005
Posts: 47
I think running vs non-running maybe is like 3/4 of a turn, but, once you get it running, 1/16th of a turn does make a material difference in the mixture.
Reply With Quote
  #9  
Old 02-25-2009, 09:12 AM
Registered User
 
Join Date: Jan 2005
Posts: 247
How does one safely remove the seal ball on the tower?
Once the ball is out, is the adjusting screw directly exposed or is there another layer of tampering prevention?
Reply With Quote
  #10  
Old 02-25-2009, 11:46 AM
slk230red's Avatar
WECO Installer
 
Join Date: Jul 2006
Location: Tampa, FL
Posts: 820
Quote:
Originally Posted by professor View Post
How does one safely remove the seal ball on the tower?
Once the ball is out, is the adjusting screw directly exposed or is there another layer of tampering prevention?
You can cut the tower off with a hacksaw just below the ball, then you can put the allen wrench in, push down and turn the adjustment screw.

*Be sure to put down protection to clean up the shavings when you cut the tower off.

__________________

1993 190E 2.3
2001 SLK230
1971 LS5 (454) Corvette Convertible
Reply With Quote
  #11  
Old 02-25-2009, 12:06 PM
Registered User
 
Join Date: Jan 2005
Posts: 247
clockwise for rich, yes? Should I monitor EHA current in the process or go for Lambda (pin 3)?
Reply With Quote
  #12  
Old 02-25-2009, 01:11 PM
Registered User
 
Join Date: Nov 2008
Location: Long Island
Posts: 578
Quote:
Originally Posted by marlinspike View Post
Well you can't just go from max to max. Try taking it all the way lean and then richening it one full turn at a time until it starts. Then, once it's warmed up, make your fine tuning adjustments while the car is running.
You may want to start with fresh spark plugs also. Give yourself the best chance of starting without having to overcome fouled plugs too.
__________________
1987 W201 190D
Reply With Quote
  #13  
Old 02-25-2009, 05:00 PM
socaleuro's Avatar
Your Polishing Pal!
 
Join Date: Sep 2008
Location: Los Angeles, CA
Posts: 71
Quick update: Started out by going all the way to max LEAN then backing out 360 of a turn and trying to start the car. Did this around 10 times, maybe more, each time turning the hex key clockwise or rich before cranking the engine. Still no success. At this point I am letting the car sit for the next hour to let whatever gas that may have flooded the engine dissipate and then doing the routine over with 180 or 'half' turns of the hex key. *fingers crossed*
Reply With Quote
  #14  
Old 02-25-2009, 07:38 PM
Registered User
 
Join Date: Nov 2008
Location: Long Island
Posts: 578
Some advice.... Pull the plugs. Not familiar with your particular engine, but disconnect the primary wires from the coil so it won't spark. Crank the engine over for 10 seconds or so at wide open throttle with the plugs out and a rag over the plug holes. That'll help clear out a lot of the "flooding." Then put in NEW spark plugs. Reconnect the coil and everything else. Then start with your full lean - 180 degree turns again.
__________________
1987 W201 190D
Reply With Quote
  #15  
Old 02-25-2009, 08:07 PM
socaleuro's Avatar
Your Polishing Pal!
 
Join Date: Sep 2008
Location: Los Angeles, CA
Posts: 71
Quote:
Originally Posted by JonL View Post
Some advice.... Pull the plugs. Not familiar with your particular engine, but disconnect the primary wires from the coil so it won't spark. Crank the engine over for 10 seconds or so at wide open throttle with the plugs out and a rag over the plug holes. That'll help clear out a lot of the "flooding." Then put in NEW spark plugs. Reconnect the coil and everything else. Then start with your full lean - 180 degree turns again.

Yea, actually did that before giving it another go to get whatever was trapped out of there. Anyhow, seems like the screw that does the adjusting at the bottom is stripped? There's no feel of engagement or that slight resistance when turning anymore. I tried for a good 20 minutes just trying to get that damn screw, I even tried 2.5mm, 4mm and similar SAE allen wrenches. Next move is to get a new 3mm and give it another shot. If that fails, it'll be time for a new lambda tower.

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 11:39 PM.


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