Quote:
Originally Posted by 400Eric
Been studying that page and cross referencing with some other material that I have.
Those EZL that offer 2 degrees less advance under no vacuum conditions (high load conditions) are for the 2.6 M103 (M103.940). It makes sense when you think about it. With about a 1/4 inch smaller bore, the 2.6 doesn't need as much ignition advance!
Ed, thanks again big time for the info and link!
Regards, Eric
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Eric
I'm researching a bit more on the potential EZL differences.
Go to page RA15 ( fourth page ) of the below link...
Seems like there were ignition map changes made to cure some problems with manual transmission cars..
http://www.tglmarketinginc.com/mbforum/servman/MB%20Service%20Manuals/www.pauldrayton.com/uploadfiles/merc/Service/W124/w124CD1/Program/Engine/103/Tech_Mods/comb3.pdf
Also a bit more info from another website:
"Yesterday I ran some tests to characterize the spark advance - engine revs curve with a dial back timing light using the OE US model 750 ohm resistor and zero (shorted the plug) and infinite (removed the resistor) resistance.
The shorted plug case is supposed to represent the least rate of advance and least total advance, and the open circuit case the highest advance rate and most total advance.
For all cases the initial timing was 9 and the vacuum line to the EZL module was removed and plugged, but prior tests indicated maximum vacuum advance of 14 degrees.
Figure reading error is plus/minus one degree and 100 revs, but might be a little more at high revs since the mark tended to jump around a little more.
750 ohm OE resistor:
17@1500
21@2000
27@2500 (maximum)
27@3000
27@3500
Zero ohm - plug shorted
09@1500
13@2000
18@2500
19@3500
21@4000 (maximum)
Infinite ohm - open circuit
16@1500
21@2000
27@2500
28@3500 (maximum) "