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 ShopForum > Technical Information and Support > Tech Help

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10-27-2003, 03:20 AM
Registered User
 
Join Date: Oct 2003
Posts: 15
560sel driveability problems

Hello, I recently purchased a 89 560sel with 145,000 miles.
within 3,000 miles it developed transmission noise so I had it rebuilt.The engine uses some oil, I have seen a puff of blue smoke ocasionaly when leaving a light. The engine has a miss at idle, especially when cold.
Sometimes when starting hot, the engine starts but won't rev up for the first 15 seconds or so. I tried new cap, rotor, wires, platnum plugs, and fuel filter. No change. That is how it was before the transmission rebuild.
Now after the rebuild I have found that at just about 3000rpm
and full throtle, the engine just bogs out. If I come off the gas for just a second, she is back full. This is in any gear. All the other conditions still exist except the front pump on the transmission no longer makes noise.
I would apreciate any input on this and hope to be of service to the forums members in the future. Thank You, Robert

Last edited by robbert; 10-27-2003 at 03:30 AM.
Reply With Quote
  #2  
Old 10-27-2003, 09:25 AM
moedip
Guest
 
Posts: n/a
"Sometimes when starting hot, the engine starts but won't rev up for the first 15 seconds or so"

It's your fuel accumulator - change it.
Morris
Reply With Quote
  #3  
Old 10-27-2003, 10:45 AM
it leaks, its german
 
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
Your smoke and skip could be a guide walking in a head as well.



Joe
__________________
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.
Raleigh NC
919-881-0364
Reply With Quote
  #4  
Old 10-27-2003, 02:27 PM
Registered User
 
Join Date: Oct 2003
Posts: 15
Morris, thank you. I now have an accumulator on order.
Joe, I suspect the valve guides need replacing and will work on finding out for sure. I thank you as well.
Reply With Quote
  #5  
Old 10-27-2003, 03:13 PM
Hatterasguy's Avatar
Zero
 
Join Date: Nov 2002
Location: Milford, CT
Posts: 19,267
I don't think platnum plugs, are right for that engine either. Stick with regular plugs, and change them every 30K.
Reply With Quote
  #6  
Old 10-27-2003, 05:17 PM
moedip
Guest
 
Posts: n/a
Robbert - I agree - get rid of the platinum plugs and go to good ol' copper - could help alleviate the miss at idle.
Reply With Quote
  #7  
Old 10-27-2003, 11:27 PM
Registered User
 
Join Date: Oct 2003
Posts: 15
So, goodby platnum plugs, hello copper. Will try. Thank you.
Robert
Reply With Quote
  #8  
Old 10-27-2003, 11:48 PM
Registered User
 
Join Date: Oct 2003
Posts: 15
Should I expect that changing the fuel accumulator and plugs back to copper will effect the 3000rpm bog down thing or is there something more I should be looking into? It only happens at wide open throtle like when I am on a hill and want to pass. The transmission shifts down and rpm rise quickly to 3000 and than it just bogs down. Could this be caused by the fuel accumulator as well?
Thank you for your help.
Robert
Reply With Quote
  #9  
Old 10-28-2003, 12:05 AM
Registered User
 
Join Date: Sep 2002
Location: Kingsport, TN
Posts: 375
Hi Robert,

my guess is that you do not get enough fuel to sustain more than 3000 rpms. The accumulator is there to help to keep the pressure up, but I wonder if your fuel pumps make enough pressure to sustain higher rpms.

When I replaced the fuel pumps on my 87, I routed the fuel hose wrongly with a kink in the hose and had exactly the result you describe.

Those are the surprises of buying 14 year old cars, my money is on the fuel pumps.

Good luck

Reinhard Kreutzer
Reply With Quote
  #10  
Old 10-28-2003, 12:32 AM
Registered User
 
Join Date: Oct 2003
Posts: 15
Reinhard,
Thank you for your input I appreciate it.
One thought I have is if it were the fuel pump would run at OVER 3000 rpm just fine? It only falters AT 3000 with a wot. Anything above or below 3000 or any rpm that the throtle is not wide open
and it runs strong.
Again thanks for your thoughts.
Robert
Reply With Quote
  #11  
Old 10-28-2003, 08:33 AM
Registered User
 
Join Date: Sep 2002
Location: Kingsport, TN
Posts: 375
Sorry Robert,

I misunderstood and thought you couldn't get above 3000 rpms.
I do not know what would cause a stumble at WOT.

Reinhard
Reply With Quote
  #12  
Old 10-28-2003, 09:28 AM
moedip
Guest
 
Posts: n/a
Double check your distributor cap and rotor - look for any carbon trails or slight cracks inside the cap . Even though they are new - double check them. This year I have had several new parts that were defective on diferent cars - the latest was a new front wheel bearing on a Jetta - when installed it worked for 2 days then the bearing had play - replaced it again and the other new one is working fine after 5 months. Just a thought - under load your ignition system is working the hardest. Another possibility could be your coil. Just out of curiosity - has it been rainy and damp where you are when this occurs? If so - definately check cap, rotor and coil. One other thing to check is to idle the car in a dark garage or outside at night and lift the hood and look for sparks along ignition wires etc.
Reply With Quote
  #13  
Old 10-28-2003, 01:09 PM
Registered User
 
Join Date: Oct 2003
Posts: 15
Morris,
I took a close look at the fuel system and I see some potential problems. On what I think is a fuel distributer there is a small black box with wires coming to it (please excuse my ignorance of the proper terms) It is leaking gas slowly out where it attaches to the distributer and maybe out a small crack.
Back at the fuel pumps it is also wet with gas. There is a cowel around the pumps and gas is puddeling in it. The wires are sitting in gas, can you beleave that. Good thing I am looking. My michanic told me that he droped the gas tank to change the fuel filter but it looks to me that the fuel filter is sitting on top of the fuel pumps. Am I wrong?
I took it out for a test this morning and determined that at ANY rpm over 3000 she bogs down.
I will check my cap right now and the wires tonight.
It rained "cats and dogs" here yesterday and I will check the cap carefully.
Your willingness to help is refreshing, Thank you
Robert
Reply With Quote
  #14  
Old 10-28-2003, 01:57 PM
Registered User
 
Join Date: Sep 2002
Location: Kingsport, TN
Posts: 375
Hi Robert,

it will look like this.

Mine leaked right through the terminal and I replaced both pumps, filter, accumulator and the hoses except for the one I couldn't get loose at the tank.

Your mechanic does not seem too familiar with MB's, because you are right, the filter is between the pumps.

I try to find a picture of the EHA, which I believe is the black box leaking under the hood. They also have a habit of leaking.

Reinhard
Attached Thumbnails
560sel driveability problems-after-start-2.jpg  
Reply With Quote
  #15  
Old 10-28-2003, 02:00 PM
Registered User
 
Join Date: Sep 2002
Location: Kingsport, TN
Posts: 375
This would be the EHA valve
Attached Thumbnails
560sel driveability problems-driver-side-view-eha-valve.jpg  
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 08:33 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2011 Pelican Parts - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page