Parts Catalog Accessories Catalog Tech Info Tech Forums
  Search our site:    
 Cart  | Project List | Order Status | Help    

Go Back   PeachParts Mercedes ShopForum > Technical Information and Support > Tech Help

LinkBack Thread Tools Display Modes
Old 08-07-2001, 10:26 PM
Posts: n/a
Ignition checks for 70 MB 250 w/114 engines

I have a 70 250 that recently has shown signs of what I have taken for ignition break down (coughing, missing in light to moderate acceleration & disappearing in moderate to hard acceleration) Now it has progressed to where it hardly runs ( major coughing & backfiring possibly thru carbs). Thank-you to M.B. Doc for the spark plug update. The compression test for cyl.1-4 were 175-180 lbs. with spark plugs showing light-medium brown deposits, cyl. 5&6 were up @185lbs. (possible slight carboning up) with the plugs wet & blackish. I have replaced the plugs, cap, wires, coil & points (rotor was B/O). It still runs like brick out house. points gapped @ .012", plugs gapped @ .020" My ignition utilizes a coil w/ neg. terminal going to ground, 2 resistors, a transistorized ignition control box and a distributor w/ points. I believe it to be a version 1 type transistorized ignition.
Can anyone tell me how to test the ignition control box or any other tests to cure this problem I'm having?
I have been thinking of putting in an after-market electronic ignition w/photo-electric pick-up to eliminate the points, can anyone advise me (pro or con) on this idea?
Reply With Quote
Old 08-07-2001, 10:33 PM
Senior Member
Join Date: Apr 2001
Location: Beech Island, S.C.
Posts: 468
First of all the point gad is too close. .016-.017 it the correct setting.
Reply With Quote
Old 08-07-2001, 10:35 PM
Senior Member
Join Date: Apr 2001
Location: Beech Island, S.C.
Posts: 468
I should have read the rest of your post but the plug gap is also wrong it should be .028" gap.
Reply With Quote


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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
1972 250 ignition questions dang50 Vintage Mercedes 2 01-05-2004 02:44 PM
Points to electronic ignition - 1972 250 rgnprof Vintage Mercedes 8 05-20-2003 06:34 PM
spark plugs for a 1970 MB 250 w/114 engine sleekauto Tech Help 1 08-06-2001 06:07 PM

All times are GMT -4. The time now is 06:56 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, 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