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 > Mercedes-Benz SL Discussion Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 09-05-2003, 09:30 AM
Registered User
 
Join Date: Mar 2003
Location: Convent Station, NJ
Posts: 755
Help me figure this problem out.......

Okay, I've read many of the CIS based problems/soulutions for the 107 SLs but one cannot always draw a solid conclusion. It seems no matter what your problem the answer could be mix or match.

Here's my problem and I was hoping for a reply from someone that experienced the same issue and repaired.

I have an '85 380sl with 56,000 miles. I'm experiencing hard WARM starts. It will fire right up when cold or hot....but 99% of the time I have to crank several times (read too many times) when warm. I think that if I pump on the gas pedal it seems to start easier in this situation. However, this could be my imagination.

next...

On several occasions I'd sit at a light with the car idling....all of a sudden the RPMs jump to about 2k....for NO reason. The car just decides to do it. So I pretty much ruled out the common stuck throttle linkage/cable. Sometimes if I turn the car off and restart it will return to normal...other times not.

Could these two problems be related?


Any clues?

Thanks guys!
__________________
Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
Reply With Quote
  #2  
Old 09-05-2003, 11:05 AM
Registered User
 
Join Date: Sep 2001
Location: Austin, TX
Posts: 563
The first problem sounds like you're losing fuel pressure. Classic symptoms of a bad fuel accumulator. You'll need a fuel pressure gauge to know for sure. J.C. Whitney has one specifically for CIS. http://www.jcwhitney.com/item.jhtml?ITEMID=1939&BQ=jcw2

I can only guess on the second problem, but I'd guess that you have an air leak somewhere. Check all of your vacuum lines. Stress fractures could cause intermittent problems that you would probably only notice at idle.
__________________
Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
Reply With Quote
  #3  
Old 09-05-2003, 01:01 PM
Registered User
 
Join Date: Mar 2003
Location: Convent Station, NJ
Posts: 755
Mike,

The accumulator is at the head of the list for the warm start problem. Thanks for verifying.

The Vacuum is an excellent suggestion...especially since my two center air vents stopped working.....I'll check the lines and connectors this weekend. Any particular area to check the lines or connectors?....certain color connectors?

Thanks a million.
__________________
Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
Reply With Quote
  #4  
Old 09-05-2003, 02:33 PM
ericdee's Avatar
Registered User
 
Join Date: May 2001
Location: Los Angeles, CA
Posts: 497
Warm start problem

When's the last time the fuel injectors where replaced? Over time they start to leak and that may be where your losing fuel pressure.
__________________
Eric, 1983 500 SL
Reply With Quote
  #5  
Old 09-05-2003, 02:41 PM
Registered User
 
Join Date: Mar 2003
Location: Convent Station, NJ
Posts: 755
Hmm, I doubt at 55k mile they've ever been replaced. Is it obvious if they're leaking?
__________________
Rick

'85 380 SL (sold)
'85 Carrera Flatnose
'71 280 SL Signal Red/Cognac
Reply With Quote
  #6  
Old 09-05-2003, 03:16 PM
ericdee's Avatar
Registered User
 
Join Date: May 2001
Location: Los Angeles, CA
Posts: 497
Look for black smoke when it starts.
__________________
Eric, 1983 500 SL
Reply With Quote
  #7  
Old 09-05-2003, 11:10 PM
moonflight
Guest
 
Posts: n/a
sl hard start ....hot

Fuel pressure can aslo be lost at the fuel pump check valve and the fuel distributor fuel pressure control valve along with previously mentionted items.

The idle problem probably is not related. I also doubt a vacuum problem since it is intermittent. I suspect a defective idle control valve or a the the idle control ECU is more likely.

Good luck.
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 04:16 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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