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 > Vintage Mercedes Forum

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 03-02-2008, 07:35 PM
Registered User
 
Join Date: Feb 2008
Location: Fort Lauderdale, Florida
Posts: 439
Question Injector Help PLEASE~~ 1975 450 SL

Hello I have a nice old 450 SL W107 I have done just about everything imaginable to correct the gas consumption (above the regular useage as I know what these are used to eating) but I have a idea since this car basically sat for a few years that there may be injector issues. I have NO experience in this arena... Anyways the car starts up cold and runs like it is on 6 cylnders until she warms up. Once she is warm she does have what it takes-but it doesnt seem 100% more like maybe 95%. (I used to have the same car-and she ran lots better and wasted fuel, but not dramatically). So while driving when she is HOT, it seems like there is a hesitation but not like major-seems like it wavers alittle at speed, and then catches then loses like a small fraction of power but nothing that a novice would even notice. If you can please anyone let me know what you know I would be grateful. Once in a blue moon I can smell some gas like a flood situation...but while I have just got on it hard. This car has had the following done in the last month: New wires, new bosch correct non resistor plugs, new fuel filter and new fuel pump (all spec) I have replaced the air flow sensor, and maybe, just maybe cracked a connection replacing the wires on the distributer (it was moving when I took off the plug wire) and finally, once in a while she will do a deisel when I shut it off from warm. Would the timing be the reason if not a faulty injector? How do you know if an injector is shot or no good? I also ran some chevron techline in the tank and that day it ran like it was new. Thank you for any help!

__________________

Timothy Evans
TimEvans35@gmail.com
CELL 310 990 6780


1985 380 SL
2010 CL 6.3 AMG
*2009 CL 550 Sport 4matic
New addition-1984 380 SE
Newest Edition 1986 300E AMG
Reply With Quote
  #2  
Old 03-02-2008, 07:47 PM
Moderator
 
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
The issues that will have that car get the best mileage can't be established without an exhaust gas analyser. Later cars with feedback control can be monitored and adjusted electrically, but that car needs to run at 17in of manifold vacuum at idle with a CO reading of less than 1% at cruise.

This will probably mean jacking the timing up 5-10 degrees and adjusting the manifold pressure sensor. Unless you have a dyno, setting that criteria will require disconnecting the idle switch to disable the idle compensation circuit while setting to 1% CO or slightly less. It will then be necessary to reconnect and adjust the idle compensation on the computer to around 2% CO.
__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
Reply With Quote
  #3  
Old 03-02-2008, 08:28 PM
Tomguy's Avatar
Vintage Moderator
 
Join Date: Aug 2002
Location: near Scranton, PA
Posts: 5,407
You have the classic symptoms of fouled trigger points.
I would remove the distributor, pull them out and clean them with a paper towel, then run a business card or index card through them!
__________________
Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k
Reply With Quote
  #4  
Old 03-02-2008, 11:36 PM
Registered User
 
Join Date: Feb 2008
Location: Fort Lauderdale, Florida
Posts: 439
wow really that sounds like the culprit! I am trying it tommorrow! Thanks! will report back!
__________________

Timothy Evans
TimEvans35@gmail.com
CELL 310 990 6780


1985 380 SL
2010 CL 6.3 AMG
*2009 CL 550 Sport 4matic
New addition-1984 380 SE
Newest Edition 1986 300E AMG
Reply With Quote
  #5  
Old 03-03-2008, 09:51 AM
Gurunutkins's Avatar
Certified Idiot
 
Join Date: Oct 2005
Location: Seattle WA
Posts: 496
Hi Tim
do you have djet or cis. I know a 74 is djet and a 76 is cis but I'm not sure about 75. what Tom is saying sounds great for djet and I would suggest that first too but you talk about replacing your air flow sensor and this is on a cis not a djet (unless you mean your intake air temp sensor). can you just confirm which you have?

cheers
Barri

__________________
61 Austin mini
67 Lotus 7
74 450sl
76 Cadillac 8.2l (501 ci)

some new cars

megasquirt conversion on:
djet 74 450sl http://www.mercdjetmegasquirt.britautorepair.com/
cis 76 450sl http://www.merccismegasquirt.britautorepair.com/

the best view is always from the point of no return
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 01:58 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page