Reliability 560SL - Mercedes-Benz Forum
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 28 (permalink) Old 07-18-2018, 02:48 PM Thread Starter
BenzWorld Junior Member
 
Quanta2's Avatar
 
Date registered: Jul 2018
Vehicle: 1986 560SL
Location: Missouri, USA
Posts: 22
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Garage
(Thread Starter)
Unhappy Reliability 560SL

I recently purchased a 1986 560 SL that have been stored in a heated garage for the last 19 years. The paint and interior are nearly perfect and the wife is slobbering, wanting to get her hands on the car. The problem is reliability. I removed the fuel tank and cleaned it out blew out the fuel lines replaced fuel pumps and filter as well as the screen. New battery and tires and the car started right up and ran like a striped assed ape! For a couple weeks I took it on short trips 30 minutes or less and it ran perfect. My confidence built up and I took it on the longer trip and it suddenly died at 50 minutes. It re-started and ran perfect for 20 more minutes died suddenly again, restarted and ran the rest of the way home, about 20 more minutes. I did some reading on these forums, and replaced the fuel pump relay. On the next drive it died at 50 minutes again, started right back up and ran perfect the rest of the way home. I parked it in the garage and have been on a one-month bike trip, just got back yesterday, decided to drive the car in to town for groceries. 15 minutes to town. It made it to the store running perfectly, when I started the car to go back home it was missing badly, black smoke out the exhaust and the economy gauge would peg itself to the right side anytime I stepped on the throttle. Grossly over rich. Barely made it home. I have ordered new spark plugs and wires. The car does not have the OBD port. Just the 9 pin circular port for the oscilloscope. I believe I have 2 separate issues. I know there is a ton of knowledge on this site. Does this scenario sound familiar to anyone out there? Thanks in advance for any direction. Would love to let the wife drive this beauty!
Quanta2 is offline  
Sponsored Links
Advertisement
 
post #2 of 28 (permalink) Old 07-18-2018, 05:10 PM
BenzWorld Veteran
 
rcrmonte3's Avatar
 
Date registered: Sep 2011
Vehicle: 1974 450SL (always needs something!) new djet engine 1991; 1961 Besasie X-3 (being restored)
Location: SE Wisconsin
Posts: 744
Mentioned: 5 Post(s)
Quoted: 222 Post(s)
Garage
Have you checked the ECU? Drops in voltage to parts of the ECU caused a similar problem in my 74 450SL.
rcrmonte3 is offline  
post #3 of 28 (permalink) Old 07-18-2018, 05:25 PM
BenzWorld Elite
 
Smackrattle's Avatar
 
Date registered: Nov 2005
Vehicle: vintage
Location: Over here
Posts: 14,512
Mentioned: 3 Post(s)
Quoted: 980 Post(s)
OVP relay?


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
"Religion is regarded by the common people as true, by the wise as false, and by the rulers as useful" - Seneca
Smackrattle is offline  
Sponsored Links
Advertisement
 
post #4 of 28 (permalink) Old 07-18-2018, 06:19 PM
It Is What It Is, Dude
 
isthisdave's Avatar
 
Date registered: Mar 2006
Vehicle: 1978 107.024 RIP
Location: InTransition
Posts: 22,739
Mentioned: 2 Post(s)
Quoted: 108 Post(s)
Lifetime Premium Member
.




^ That
isthisdave is offline  
post #5 of 28 (permalink) Old 07-18-2018, 06:30 PM Thread Starter
BenzWorld Junior Member
 
Quanta2's Avatar
 
Date registered: Jul 2018
Vehicle: 1986 560SL
Location: Missouri, USA
Posts: 22
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Garage
(Thread Starter)
How did you address the low voltage to the ECU? Is there a relay that feeds it? Ignition switch?
Thanks for the hint!
Quanta2 is offline  
post #6 of 28 (permalink) Old 07-18-2018, 06:33 PM Thread Starter
BenzWorld Junior Member
 
Quanta2's Avatar
 
Date registered: Jul 2018
Vehicle: 1986 560SL
Location: Missouri, USA
Posts: 22
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Garage
(Thread Starter)
OVP relay sounds like an easy part to try. Where is it located? Thanks
Quanta2 is offline  
post #7 of 28 (permalink) Old 07-18-2018, 07:22 PM
It Is What It Is, Dude
 
isthisdave's Avatar
 
Date registered: Mar 2006
Vehicle: 1978 107.024 RIP
Location: InTransition
Posts: 22,739
Mentioned: 2 Post(s)
Quoted: 108 Post(s)
Lifetime Premium Member
.



Post number five in this thread, from the General Tech section of the EGV107, our reference library.
isthisdave is offline  
post #8 of 28 (permalink) Old 07-18-2018, 07:46 PM Thread Starter
BenzWorld Junior Member
 
Quanta2's Avatar
 
Date registered: Jul 2018
Vehicle: 1986 560SL
Location: Missouri, USA
Posts: 22
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Garage
(Thread Starter)
Thanks for the location. Must be right where I changed out the fuel pump relay, behind the glove box.
Quanta2 is offline  
post #9 of 28 (permalink) Old 07-18-2018, 08:01 PM
BenzWorld Veteran
 
rcrmonte3's Avatar
 
Date registered: Sep 2011
Vehicle: 1974 450SL (always needs something!) new djet engine 1991; 1961 Besasie X-3 (being restored)
Location: SE Wisconsin
Posts: 744
Mentioned: 5 Post(s)
Quoted: 222 Post(s)
Garage
Quote:
Originally Posted by Quanta2 View Post
How did you address the low voltage to the ECU? Is there a relay that feeds it? Ignition switch?
Thanks for the hint!
Eventually the car died and wouldn't restart. Finally found a working ECU that matched the 1 in the car. Replaced ECU. Car works fine now. There are a couple members here who might have one. But check everything else first. Also, you have to check the voltage to/from EACH terminal (pin) on the ECU. I don't think there's a relay that feeds it. Also, if the ignition has a fault, the ECU would work only when the ignition switch is fully functional. Ignition switch and circuits are easier to trace and less expensive to fix. If there is low voltage to 1 or more of the pins on the ECU, trace those circuits 1st and make any repairs. If none of the repairs help, or if there are no faults in the circuitry, it's the ECU.
rcrmonte3 is offline  
post #10 of 28 (permalink) Old 07-18-2018, 08:31 PM Thread Starter
BenzWorld Junior Member
 
Quanta2's Avatar
 
Date registered: Jul 2018
Vehicle: 1986 560SL
Location: Missouri, USA
Posts: 22
Mentioned: 0 Post(s)
Quoted: 6 Post(s)
Garage
(Thread Starter)
Thanks for the good advice. I have a newbie question. On my 560, if it fails to start on the first try, the starter will not engage again unless I turn the key to the off position first, then rotate to start again. Is yours like this? Or is this something wrong with mine?
Quanta2 is offline  
Sponsored Links
Advertisement
 
Reply

  Mercedes-Benz Forum > Mercedes-Benz Roadster Forums > R/C107 SL/SLC Class

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Mercedes-Benz Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may 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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 

Title goes here

close
video goes here
description goes here. Read Full Story
For the best viewing experience please update your browser to Google Chrome