1980 450 SL issues (70,000 miles) - Mercedes-Benz Forum

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 02-17-2009, 11:24 AM Thread Starter
BenzWorld Newbie
Date registered: Feb 2009
Posts: 1
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
1980 450 SL issues (70,000 miles)

1. HVAC system quits during acceleration.
2. Engine has the power of a 4 cylinder Cavalier! Won't pull itself out of the way unless timing is advanced to 5 or 6 degrees BTC. (Then it runs like the afore mentioned Cavalier.)
3. Cruise control will not engage. It will pull the car and continue to speed up but when you let go of the lever, it doesn't engage.

Can't find anything wrong with vacuum in the HVAC system but trying to diagnose the engine and the cruise vacuum systems is impossible as no information seems to be available anywhere. I have the MB service manual (on DVD), access to Chilton, etc manuals.

I have had the car in a repair shop and spent way too much money to no avail on these issues. (In fairness, they did correct another problem but none of these)

I believe and the mechanic agrees, these all seem to be vacuum issues, but I'll accept any others that may lead to some help. Dynamite?
Jim Dillman is offline  
Sponsored Links
post #2 of 2 (permalink) Old 02-17-2009, 01:18 PM
BenzWorld Elite
Date registered: Oct 2007
Vehicle: 2002 SLK 230 1986 560SL 2008 Honda CRV
Location: Rochester,NH USA
Posts: 3,664
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Welcome to Benzworld
livefreeordie is offline  
Sponsored Links

  Mercedes-Benz Forum > General Mercedes-Benz Forums > General Mercedes-Benz

Quick Reply

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


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

Email Address:


  • 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

    Similar Threads
    Topic Author Forum Replies Last Post
    $23,000 6.9 with 104,000 miles on eBay..... *snicker* Nutz 4 Benz W116 S, SE, SEL, SD Class 5 01-11-2009 09:03 PM
    FS: 2000 SLK230 Sport - 80,000 miles - $14,000 OBO uofmrapper For Sale/Wanted/Trade/Giveaway 0 09-09-2008 07:23 AM
    After a $2,000 valve job on '91 300E @ 185,000 miles, .... JJB236 W124 E,CE,D,TD Class 18 07-18-2006 10:40 AM
    For Sale: 1990 Mercedes-Benz 500SL with 54,000 miles for $35,000 OBO Guest (MBNZ) R129 SL-Class 6 05-12-2002 07:33 PM
    1998 G 20,000 miles $30,000.00 no damage Chris G-Class 4 04-19-2001 01:44 PM

    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

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