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 > Mercedes-Benz SL Discussion Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-22-2006, 10:45 AM
Registered User
 
Join Date: Oct 2006
Posts: 10
1994 SL600 will not start

I am new here but have been reading a lot of post trying to figure out the problem with my 1994 SL 600. I have owned the car for about 6 months without any incidents. The Mercedes shop checked the car shortly after purchased and they said everything looked good. Here is a brief outline of the problem. The other day I was going to pick up my daughter and was on the open road (55 mph). The car shut off, slowed down but started back up. 15 minutes later the car shuts off, slows down and stops (check engine light comes on). I wait for about 5 minutes and the car starts and I'm rolling down the road again. 10-15 minutes later...the same thing (the cars shuts off, slows down but starts back up before stopping). No check engine light!!! Understand, I am worried because several people told me I did not need nor could I afford a SL600. After I picked up my daughter the car ran fine for the next 50 miles. This afternoon (a week later) I go to start the car, it starts but runs terrible for about 10 seconds and then it cuts off. I try 4-5 times to start but no success. The car turns over fine but no attempt at starting. Hope someone has good news for me. Thanks in advance.
Reply With Quote
  #2  
Old 10-22-2006, 02:07 PM
snowbilt's Avatar
Registered User
 
Join Date: Jun 2006
Posts: 51
Have you by chance got new tires and/or wheels recently? Sometimes if the tires and wheels are not all the right size it will cause it to go into "limp mode" There have been several posts on this problem. Anyone else got any ideas?
Reply With Quote
  #3  
Old 10-22-2006, 03:21 PM
page62's Avatar
Registered User
 
Join Date: Sep 2005
Location: Luckenbach, Texas
Posts: 436
I don't know squat about SL600's, but that sounds like a fuel pump to me. Or perhaps it's a bad relay, like a fuel pump or OVP relay.
__________________
'01 SLK320, '79 450SL & '01 C320 -- What? 3 Mercedes? I am DEFINITELY crazy!!!
Reply With Quote
  #4  
Old 10-22-2006, 03:28 PM
Registered User
 
Join Date: Oct 2006
Posts: 10
Thanks,
I was wondering about the OVP relay. Anyone else??? I tried to start it again this morning and it cranked but then cut off again. Can anyone tell me where the OVP relay might be located.
Clay
Reply With Quote
  #5  
Old 10-22-2006, 04:25 PM
Registered User
 
Join Date: Jul 2006
Location: Newport Beach, California
Posts: 33
The culprit is most likely the OVP relay.
Try to bypass it and see if it'll runs OK.
Than you'll know.
Good luck...Lee
__________________
350SL, 300CD, 450SL, 450SLC, 560SEL, 560SL, SL500SL500R
Reply With Quote
  #6  
Old 10-22-2006, 05:32 PM
Registered User
 
Join Date: Oct 2006
Posts: 10
Any info on how to bypass the OVP relay???
Reply With Quote
  #7  
Old 10-22-2006, 05:35 PM
88Black560SL
 
Join Date: Oct 2004
Location: NC
Posts: 2,863
Quote:
Originally Posted by snowbilt View Post
Have you by chance got new tires and/or wheels recently? Sometimes if the tires and wheels are not all the right size it will cause it to go into "limp mode" There have been several posts on this problem. Anyone else got any ideas?
Limp home mode will only cause the engine to run on six cylinders. It will actually run so well in limp home mode that some people dont even know they have a problem. You still have about 150 HP in limp home mode. It should not stall. I agree with one of the other post. Most likely fuel pump related, possibly pump or pump relay related.

I'm not sure what the OVP relay does. It sound like something that would cut the alternator current in an over voltage situation. If thats the case the fuel pump should be still able to function on the battery???

In any case you are very lucky that the pronblem is repeatable enough for the problem to be found. I went through hell with a Ford Taurus that had a bad relay on a semi weekly basis.

John Roncallo
Reply With Quote
  #8  
Old 10-22-2006, 07:29 PM
Super Moderator
 
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
The OVP relay provides a constant voltage to the engine electronics. It also has a fuse that will blow to protect against shorts. If the relay or the fuse goes out you will have a high idle and probably an ABS light.

This sounds like a fuel pump relay to me. Can you have someone crank the engine while you put your hand on the pumps to see if they are vibrating and getting power?
__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
Reply With Quote
  #9  
Old 10-22-2006, 09:01 PM
Registered User
 
Join Date: Oct 2006
Posts: 10
I will try to take a closer look at everything tomorrow. I haven't noticed a high idle because the car won't start. When the car was running...it ran perfect. Just before the car would cut off running down the road there was plenty of power and purring like a kitten. I want to thank everyone who is trying to help me with this problem.
Reply With Quote
  #10  
Old 10-23-2006, 01:28 AM
Registered User
 
Join Date: Nov 2005
Posts: 39
Locate the fuel pump relay (usually by the firewall ) and shake it to see if it's loose; if starts and runs OK after you fiddle with it then its a loose relay; no need to change it (expensive if bought from MB dealer). Buy some bayonet style sleeves from the auto parts store and insert one or two in the electrodes to tighten it up and then everything will be OK. Has happened to me twice and this has been the cure.
Reply With Quote
  #11  
Old 10-23-2006, 12:55 PM
"99 SL500
 
Join Date: Oct 2004
Location: Jacksonville Fla.
Posts: 332
sl 600

If it was a later model I would have to guess crankshaft positioner sensor,
Bosch F6010-51307 $161.00 at Fastlane, top of the page. Just a guess.
Reply With Quote
  #12  
Old 10-23-2006, 08:43 PM
Registered User
 
Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
I would read the diagnostic codes and see what they tell you. This requires a $1.29 LED from Radio Shack or some other device. If you want help with this, search the archives or send me an email.
Reply With Quote
  #13  
Old 11-03-2006, 08:30 AM
Registered User
 
Join Date: Oct 2006
Posts: 10
The car started the other day and I moved it. I was happy but when I went out this morning to take for a drive all it would do was turn over like it wasn't getting any fire. Turns over with no problems but doesnt try to start. HELP>
Reply With Quote
  #14  
Old 11-03-2006, 12:13 PM
Super Moderator
 
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
It isn't going to fix itself ...

Did you check out the fuel pump relay as you were advised?
__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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 03:06 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, 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