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 04-15-2002, 11:09 PM
Registered User
 
Join Date: Apr 2002
Location: New York
Posts: 4
Long Cranking Time to Re-Start.

Hello Everyone, I'm new here, and VERY gratefull, This is a great resource and help to me. THANKS!

I just got, (about 2 months) an 87 560SEL 75Kmiles. Runs great, but..... When cold, it starts easily. If restarted within 5 minutes, it re-starts easily. If left for 20-30 minutes it takes an extended cranking time to start, about 5-7 full (long) seconds. During the long cranking, there is no coughing, catching, no nothing for about 5 seconds, then it comes to life,... rough for about 10-15 seconds. The symptons are very consistent.

From reading other threads, it seemed likely that the fuel line pressure was leaking off and fuel vaporizing? I've changed the fuel pump check valves, (both) and then the fuel accumulator. No improvement what-so-ever. So now what? Help....

I'm kinda clueless as to next logical step. Pressure checking? If so where? Thanks for you help in advance. JP
Reply With Quote
  #2  
Old 04-16-2002, 09:10 AM
Moderator
 
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Fuel bleed off is a common problem that will cause this type of symptom. The only thing in the fuel pressure system that you haven't replaced is the fuel pressure regulator. However I would suggest that you have the fuel pressure tested to see whether the fuel pressure does bleed off when the car is shut off.
Many times a weak coil OR bad cap & rotor can cause the exact problem.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
Reply With Quote
  #3  
Old 08-12-2002, 11:54 PM
Registered User
 
Join Date: Apr 2002
Location: New York
Posts: 4
Follow-up info. (It runs well so itís kinda on a back burner among a million other things to do but,Öas time allowsÖ) Borrowed a fuel pressure gauge. It runs at 80 psi, shutting it off brings it pretty quickly to 50 psi. 30 minutes later itís still at 40 psi. Bought the shop manual. (Talk about a hard reading, poorly index CD book). Ouch. Specs seem to be in line with what Iíve got. 6.2 bar, (which if 1 bar =14.7 psi) then it should be 91 psi. Iím at 80. At shut down book says it should be below 3.4 bar. (49psi) Iím at 50 falling to 40 after 30 minutes.

Brought the car to an independent MB shop who agreed to diagnosis for $50. He claimed electrical is fine, & no codes showing up, & checked fuel pressure confirming my findings and said it was good, but diagnosed with 90% confidence level the fuel injectors as the problem. Claimed he had pulled 3 injectors and all were bad. $600-$800 for him to do the work. I did it for $250 with great hesitation never having done it before. (Itís almost as easy as changing spark plugs.) During removal, I found gas in only 3 of the injectors. Things seemed like they were looking good. Well they must have been bad because itís running sooooo much smoother, so I wonít complain, BUT absolutely no effect on the hard starting. When hot, and 30 minutes, itís still 5-7 seconds till started.

Any one got some further thoughts?
Reply With Quote
  #4  
Old 08-13-2002, 12:30 PM
daviddddd
Guest
 
Posts: n/a
Re: Long Cranking Time to Re-Start.

Quote:
Originally posted by JP560
Hello Everyone, I'm new here, and VERY gratefull, This is a great resource and help to me. THANKS!

I just got, (about 2 months) an 87 560SEL 75Kmiles. Runs great, but..... When cold, it starts easily. If restarted within 5 minutes, it re-starts easily. If left for 20-30 minutes it takes an extended cranking time to start, about 5-7 full (long) seconds. During the long cranking, there is no coughing, catching, no nothing for about 5 seconds, then it comes to life,... rough for about 10-15 seconds. The symptons are very consistent.

From reading other threads, it seemed likely that the fuel line pressure was leaking off and fuel vaporizing? I've changed the fuel pump check valves, (both) and then the fuel accumulator. No improvement what-so-ever. So now what? Help....

I'm kinda clueless as to next logical step. Pressure checking? If so where? Thanks for you help in advance. JP




I have a 78 450 slc and have the same long cranking time problem. I thought it was a cap and rotor problem as another person responding to your post did. I replaced them and the problem continues. I am now looking at the balast resistors
( mounted beside the coil) as the problem, if I have any luck I will let you know. If you find your problem, drop me a line- I would appreciate it. Good luck!
Reply With Quote
  #5  
Old 08-13-2002, 01:20 PM
it leaks, its german
 
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
Here is a couple of long shots, but, they happen.

1) ign. switch.

2) fuel head leaking from the mertering pintle. Drops right into the a/f housing.

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
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
any planning to keep there ml for a long time phillip ML, GL, G-Wagen, R-Class, Unimog, Sprinter 11 04-08-2007 07:46 AM
Best way to store injectors for a long time cook Diesel Discussion 2 07-03-2004 01:14 PM
1988 300 SEL, A/C, not used for long time? rbellamy1 Tech Help 4 07-18-2003 04:46 PM
Please help me start a non-starting 240D. ericnguyen Diesel Discussion 4 05-15-2003 10:58 AM
Long cranking CMuc Tech Help 9 07-30-1999 02:12 AM



All times are GMT -4. The time now is 06:19 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