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 11-25-2005, 09:13 PM
Registered User
 
Join Date: Nov 2005
Posts: 3
1977 280E Fuel probs.Undrivable!

Hi Guys,

I am in the process of getting '77 280E 123 model running again.

I'm having trouble with hesitation and lack of power making the car to be undrivable.

It seems to get the worse as the engine gets warmer.

Idles fine when cold and seems to rev ok with a bit of a miss here and there.

Once a bit of heat gets into the motor the idle drops and turns lumpy and it just doesn't want to rev.

I detached the warm up regualtor from the block and disconected the electrical conection.

To see if it would make any difference.It seemed to idle properly for a bit longer and could be driven under 15 klms per hour for about 5 -10 minutes.

Then returned to a lumpy idle and and no power/stalling condition.

I checked the voltage to the fuel pump when cold and got 11.5V and when it was warm i had 10.5V is this normal? would this be enough to send the pump lazy and reduce the flow of fuel? and cause these problems?

Thanks for any help.

Jeremy

Reply With Quote
  #2  
Old 11-25-2005, 10:49 PM
t walgamuth's Avatar
dieselarchitect
 
Join Date: Apr 2005
Location: Lafayette Indiana
Posts: 35,538
does

it smoke black when it is running badly?

my 280e had a bad warm up compensator which made it run very rich.

if it is smoking black that might be the prob

tom w
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
Reply With Quote
  #3  
Old 11-26-2005, 01:51 PM
Super Moderator
 
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
I always thought the pump needed at least 11.5 volts to work right. Try jumping 30 and 87 on the FP relay and see if that improves the feed to the pump and the running problems. If so, then that would mean the relay is going bad.

You should also check the EGR valve. They can cause a massive vacuum leak when the engine warms up.
__________________
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
  #4  
Old 11-29-2005, 01:50 AM
Registered User
 
Join Date: Nov 2005
Posts: 3
Thanks Guys,

The car doesn't seem to idle too rich no black smoke anyway.

I have a gut feeling the Warmup regulator is the culprit.

C taylor- Could you please tell me where I can find the FP relay?

It's a 1977 280E w123 RHD model.

Thanks heaps. Jeremy

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 04:54 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, 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