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 06-11-2007, 09:09 PM
waybomb's Avatar
Registered User
 
Join Date: Nov 2002
Location: St. Joe, MI; Manitowoc, WI
Posts: 1,553
Help with starting problem 1991 300SL

Hi all

I hate this when it happens!

I replaced the alternator and the air pump with new units. Before I reinstalled the new ones, I degreased that side of the engine and hosed it down sparingly. I did not do the intake side at all.

I also pulled the valve cover off to check things out. No problems, chain fine.

Reasembled everything.

The car ran fine before I did my planned maintenance. Now the engine cranks fine, but no start.

I double checked the plug wires - all correctky installed. I find no wires disconnected anywhere. I do not see anything on the exhausr side of the engine that seems electronic in nature that I could have ruined or got wet when I cleaned that side of the engine.

I see a crank trigger - maybe I got it wet, but I suspect it gets wet anyway when driving in the rain.

What do y'all think I should check?

Thanks.

__________________
Thank You!
Fred
2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
1988 46' US1 Cougar, 3 supercharged 572's
http://s4.photobucket.com/albums/y145/waybomb/
Warming the globe, 24 cylinders at a time
And I want a 126 wagon! Point me to one!
Reply With Quote
  #2  
Old 06-11-2007, 09:17 PM
Senior Member
 
Join Date: Jul 2002
Location: visalia ca
Posts: 368
first is whats missing. fire, fuel or comp.

george
Reply With Quote
  #3  
Old 06-11-2007, 09:39 PM
waybomb's Avatar
Registered User
 
Join Date: Nov 2002
Location: St. Joe, MI; Manitowoc, WI
Posts: 1,553
No fire. That's why I was suspecting the trigger getting wet with cleaner or water, or both. That's about the only electrical item in the area that I can see. Maybe there's something else?

How does one check the trigger?
__________________
Thank You!
Fred
2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
1988 46' US1 Cougar, 3 supercharged 572's
http://s4.photobucket.com/albums/y145/waybomb/
Warming the globe, 24 cylinders at a time
And I want a 126 wagon! Point me to one!
Reply With Quote
  #4  
Old 06-12-2007, 09:18 AM
mespe's Avatar
benzbonz
 
Join Date: Feb 2005
Location: Cleveland, Ohio
Posts: 1,848
spray the inside of your distributor cap with WD-40 might have gotten some water in there
__________________
Closing the store
Benzbonz.biz
on your smart phone or tablet.
Reply With Quote
  #5  
Old 06-12-2007, 08:02 PM
waybomb's Avatar
Registered User
 
Join Date: Nov 2002
Location: St. Joe, MI; Manitowoc, WI
Posts: 1,553
Pulled the cap -dry.
Cleaned the bottom of the trigger.

Now I have spark, but no start.
What's a safe way to test if I have fuel at the injectors?

The car sat in the garage all winter. I started it once a month. It fired right up every time. All I did was change the alternator and the air pump! Sheesh!

I did notice a mouse had taken a little bit of firwall insulation covering. I looked all over and could find no wires the critter tried to strip. I pulled the cover off the fuel pumps/filter/accumulator and everything is ok in there. I check ed all the fuses.

What controls the fuel pumps? How do I check the circuit?

Thanks for your help.

It's too nice out to be working on it instead of driving topless!
__________________
Thank You!
Fred
2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
1988 46' US1 Cougar, 3 supercharged 572's
http://s4.photobucket.com/albums/y145/waybomb/
Warming the globe, 24 cylinders at a time
And I want a 126 wagon! Point me to one!
Reply With Quote
  #6  
Old 06-12-2007, 08:54 PM
Registered User
 
Join Date: Aug 2001
Location: Houston, Texas
Posts: 393
Make sure your belt is not too tight. I had the same problem a day back, just felt like my belt was loose and I tightened it (on 87 260E). The next thing I knew was it had starting problems that I never ever had. I also had put some engine degreaser and some water to clean the engine's front area. So I thought it was water and I can wait a few hours and it will start fine. Infact, it did start couple of times fine the next day (today) but then failed to start again. I figured it had to be the tightened belt. So I loosened it a bit and guess what, the car started just fine, several times. I am not sure what the reason is but a belt which is tighter than needed causes starting problems.
__________________
Saumil S. Patel
Reply With Quote
  #7  
Old 06-12-2007, 08:59 PM
waybomb's Avatar
Registered User
 
Join Date: Nov 2002
Location: St. Joe, MI; Manitowoc, WI
Posts: 1,553
The belt is on an automatic belt tensioner - seems like the same amount of pressure as any of the other later model cars with the tensioner.
__________________
Thank You!
Fred
2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
1988 46' US1 Cougar, 3 supercharged 572's
http://s4.photobucket.com/albums/y145/waybomb/
Warming the globe, 24 cylinders at a time
And I want a 126 wagon! Point me to one!
Reply With Quote
  #8  
Old 06-12-2007, 09:12 PM
Registered User
 
Join Date: Aug 2001
Location: Houston, Texas
Posts: 393
O.K., I see, then it cant be the problem.
__________________
Saumil S. Patel
Reply With Quote
  #9  
Old 06-13-2007, 08:18 PM
waybomb's Avatar
Registered User
 
Join Date: Nov 2002
Location: St. Joe, MI; Manitowoc, WI
Posts: 1,553
It started!

I've never checked for fuel on a fuelly before, so since nobody answered, I figured I'd loosen a line at the fuel distributor. I cranked a while and the fitting got wet. So, I must have had fuel all along. I never did hear the fuel pump run, but then again, I never do. I had nobody around to help me so I could not climb under the car and touch the fuel pumps to see if they were operating at initial turn of the key.

I sprayed the crank sensor down heavily with contact cleaner. I jiggled wires. I took the air cleaner asy off and followed the crank sensor wire - found it to go the ignition module. Disconnected and reconnected all of those wires. I soaked the sensor down with some more contact cleaner. I cranked the engine like crazy, and it started. And ran smooth as soon as it started. I figured it would at least shake rattle and roll. Nope, just kicked off and ran like it should.

I wish I knew what was going on.

I'll try to start it again tomorrow after work.

Anyway, the new alternator and air pump are real quiet. This engine runs quiet now - am happy.

__________________
Thank You!
Fred
2001 E430 Sport, 204,000 miles
1997 C280 Sport, 144,000 miles
1991 300SL, 189,000 miles
1987 420SEL, 149,000 miles
1986 190e 2.3 16v, 151,000
1968 W30 442, 78,000 miles
1988 46' US1 Cougar, 3 supercharged 572's
http://s4.photobucket.com/albums/y145/waybomb/
Warming the globe, 24 cylinders at a time
And I want a 126 wagon! Point me to one!
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 11:10 AM.


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