280SE 4.5 engine trouble - Page 2 - Mercedes-Benz Forum

Reply
 
LinkBack Thread Tools Display Modes
post #11 of 42 (permalink) Old 04-26-2009, 10:07 PM
BenzWorld Senior Member
 
Date registered: Jul 2004
Vehicle: 1971 280SE 3.5 Coupe
Location: Nevada City, ca
Posts: 413
Mentioned: 1 Post(s)
Quoted: 8 Post(s)
Old fuel

Hi Brian,
Didn't know you had old gas in the car.
If you have old fuel you car will run badly if at all even if fuel stabilizer was added. The fuel stabilizer only lasts for a few years. You would be amazed at what some fresh fuel would do.
Tony

Tony
280SE 3.5 Coupe
Stick shift
3.27 Axle
5.6 Iron block build in progress
3.5 Tony is offline  
Sponsored Links
Advertisement
 
post #12 of 42 (permalink) Old 04-27-2009, 12:32 AM Thread Starter
BenzWorld Junior Member
 
betoface326's Avatar
 
Date registered: Apr 2009
Vehicle: 1972 Mercedes Benz 280SE 4.5
Location: Seattle
Posts: 10
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
I made it to the gas station and loaded up on some fresh gas + additive and a few quarts of oil (which was suprising low...). It's driving pretty well, but there is still some occasional backfiring noises coming from the engine (not the exhaust though...). I'm hoping to get the 5 miles or so in the morning to the shop without issue for an oil change and inspection.

Thanks again
-Brian
betoface326 is offline  
post #13 of 42 (permalink) Old 04-27-2009, 10:57 AM
BenzWorld Senior Member
 
Date registered: Jul 2004
Vehicle: 1971 280SE 3.5 Coupe
Location: Nevada City, ca
Posts: 413
Mentioned: 1 Post(s)
Quoted: 8 Post(s)
Brian,
How much old fuel was remaining? If there was much it will still influence how the car runs. You need to get all the old fuel out before you can truly evaluate performance.
Tony

Tony
280SE 3.5 Coupe
Stick shift
3.27 Axle
5.6 Iron block build in progress
3.5 Tony is offline  
post #14 of 42 (permalink) Old 04-28-2009, 01:13 PM
BenzWorld Elite
 
hbar's Avatar
 
Date registered: Feb 2007
Vehicle: '74 & '78 450 SEL
Location: Illinois
Posts: 6,430
Mentioned: 2 Post(s)
Quoted: 636 Post(s)
Quote:
Originally Posted by betoface326 View Post
Also, I just checked and there is some whitish smoke coming from the exhaust. Not sure what this means... is it safe to drive <5 miles or should i tow it to a shop?

Thanks!
-Brian


Low power + misfiring + white smoke in exhaust = water in combustion chamber

This is usually due to a blown head gasket although it's possible the water is contamination from the car sitting so long.

Last edited by hbar; 04-28-2009 at 01:17 PM.
hbar is offline  
post #15 of 42 (permalink) Old 04-28-2009, 02:05 PM Thread Starter
BenzWorld Junior Member
 
betoface326's Avatar
 
Date registered: Apr 2009
Vehicle: 1972 Mercedes Benz 280SE 4.5
Location: Seattle
Posts: 10
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
(Thread Starter)
I drove the car around yesterday after taking it in for an oil change/inspection at a MB service location here. I was able to drive around for an hour with the engine never heating up passed 150... There were a few items they mentioned after the inspection (no A/C belt, front end overhaul, rear brake drag, etc.) but nothing that they deemed an emergency. My concern is that there is something going on with the transmission, but I plan to take it in to a local shop (benz friendz) and have them take a look.

I do have a couple of questions:
- Is there a good way to determine if the water is there from sitting, as opposed to a blown head gasket? If so, is there a good way to drain/remove the water?
- What should I tell/ask the mechanic so I don't a) look like a complete idiot, and b) get an overwhelming list of things that are "wrong"?
- What's the best way to determine if I shouldn't be driving it as is?

Thanks again,
Brian

Last edited by betoface326; 04-28-2009 at 02:07 PM.
betoface326 is offline  
post #16 of 42 (permalink) Old 04-29-2009, 08:37 AM
BenzWorld Senior Member
 
Date registered: May 2007
Vehicle: 64' 220SEc, 72' 300SEL 6.3, lots of parts
Location: San Diego/Spring Valley
Posts: 512
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
This car will test you persistence and commitment.

Temperature too low, needs thermostat replaced.
Loose front end, first replace tie rods, drag link, repack and adjust wheel bearings .
Full lubrication service, engine, trans, rear axle.
Grease gun all fittings. front to rear.
Adjust valve clearance, new valve cover gaskets and bolt seals.
Compression and cylinder leak-down test.
Routine items, motor mounts, sub-frame mounts,
then do the other routine items like injector seals, fuel line replacements. on, and on, until all old rubber parts replaced. Lots of rubber items.

But this is why these cars are superior for their time.
And still good cars. just need regular maintenance.
By the way, the newest car I have ever owned is a 280SEL 4.5 (and the 300SEL 6.3)
Yes I am living in the past.
There is no reason to own anything different.

Oh, and note this, on one car (280SEL) I bought with complete maintenance records,
The maintenance $$ over time added up to more than the initial cost of the car, Same is true with Boeing 747's and other mechanical things.

Break out the wallet, there is no free transportation, pay the dealer, the mechanic, the parts supplier, or walk.

Once the maintenance level is up the cost of ownership can be as low as $25 /month average (documented results) even with items such as transmission rebuild.

These are the cheapest cars on the road, over the long haul.

Brian O
bostosh is offline  
post #17 of 42 (permalink) Old 04-30-2009, 11:19 AM
BenzWorld Member
 
4.5_sport's Avatar
 
Date registered: Apr 2004
Vehicle: 1994 E320T, 1979 VW Rabbit
Location: Steilacoom, Wa
Posts: 71
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Send a message via MSN to 4.5_sport
Brian,

I too own an SE 4.5. I live in Tacoma. I had driven mine daily for several years before moving and letting it sit for 2 years....bad choice. I am now in the process of getting it drivable again. Get in touch if you want to talk 4.5's. I'm always around.

Jason

vwwrencher (at) hotmail (dot) com
4.5_sport is offline  
post #18 of 42 (permalink) Old 11-14-2009, 08:21 AM
BenzWorld Member
 
Date registered: Apr 2009
Vehicle: 1972 Mercedes Benz 280 SEL
Posts: 52
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
My 1972 280 SEL 4.5 is running rich. I have replaced the air flow sensor, the water temp sensor and the cold start valve. Even though I have the CD manual, I cannot figure out what the part is next and just to the left of the water temp sensor? It has a brown plastic top with wires coming out of it. The brand appears to be "K" with the number 9656 on it. Can anyone help identify this or give any suggestions as to why the car runs rich? Thanks!
Packard1807 is offline  
post #19 of 42 (permalink) Old 11-14-2009, 09:08 AM
GGR
BenzWorld Elite
 
Date registered: Apr 2006
Vehicle: W111 Coupe
Location: Washington DC
Posts: 1,205
Mentioned: 1 Post(s)
Quoted: 19 Post(s)
This may be the thermo switch. It enables the "ECU" to activate the cold start injector when engine is cold. See if your MAP sensor is in good shape. Does it hold vacuum?
GGR is offline  
post #20 of 42 (permalink) Old 11-14-2009, 09:11 AM
BenzWorld Member
 
Date registered: Apr 2009
Vehicle: 1972 Mercedes Benz 280 SEL
Posts: 52
Mentioned: 0 Post(s)
Quoted: 0 Post(s)
Thanks. If the door locks work, does that indicate it is holding vacuum?

What is the MAP sensor and where is it located?

Also, could the thermo switch affect the fuel mixture? Where could I buy one? Sorry for all the questions, and thanks for your help.
Packard1807 is offline  
Sponsored Links
Advertisement
 
Reply

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

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



    Similar Threads
    Topic Author Forum Replies Last Post
    280SE Opening the engine zd123 W126 S,SE,SEC,SEL,SD,SDL Class 10 12-03-2008 06:13 AM
    280se 3.5 engine swap abad190 Vintage Mercedes-Benz 8 04-18-2008 09:02 AM
    Engine swap: 280SE with a 300SD engine? stumptown_dan W116 S, SE, SEL, SD Class 3 12-06-2007 10:47 PM
    Starter engine removal on 280SE 4.5 Nick1 Vintage Mercedes-Benz 7 01-24-2007 08:52 PM
    280SE 3,5 Engine Electric Diagram Guest (MBNZ) General Mercedes-Benz 0 03-20-2001 02:36 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

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