I'm not finding much here. I'm assuming this is the black thing on my drivers side wheel well with a vac line, and three electrical lines (?) running to it. How does it work, and what relation does it have to the vac line going to it. Bleed off? This is on my w124. Thanks.

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1989 300E 144K

The EZL is the ignition control module.

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'86 300E 5 speed
'71 Triumph TR6
'46 Cushman Scooter
'41 Ford 9N tractor

Thanks. How does it work, and what relationship does it have to the vacuum system?

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1989 300E 144K

The hose that plugs into the EZL goes to the intake manifold and carries the vacuum signal so the ignition knows when to advance and retard timing.

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'86 300E 5 speed
'71 Triumph TR6
'46 Cushman Scooter
'41 Ford 9N tractor

Elektronische Zund Lage? or Leiter?

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Strelnik
Invest in America: Buy a Congressman!

1950 170SD
1951 Citroen 11BN
1953 Citroen 11BNF limo
1953 220a project
1959 180D
1960 190D
1960 Borgward Isabella TS 2dr
1983 240D daily driver
1983 380SL
1990 350SDL daily driver alt
3 x Citroen DS21M, down from 5
3 x Citroen 2CV, down from 6

Elektronische Zundanlage

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'86 300E 5 speed
'71 Triumph TR6
'46 Cushman Scooter
'41 Ford 9N tractor

Thanks guys. I'm trying to chase down vac leaks. When I block the vac that goes to the EZL, my idle drops. Does this sound normal?

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1989 300E 144K

Yes, it sounds normal.
When vaccum drops, timing is retarded. Engine runs slower.
When vaccum increases, timing is advanced. Engine runs faster.

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'86 300E 5 speed
'71 Triumph TR6
'46 Cushman Scooter
'41 Ford 9N tractor

for new members

EZL QUESTION... 87 560sl stalls as soon as it reaches operating temp (+80c). WILL NOT RESTART UNTIL COMPLETELY COLD AGAIN. The cycle then repeats...perfect start first click of the key, idles or runs until +80c and then stalls instantly. Crank position sensor replaced ... no change. Coolant Temp sensor replaced, no change. Coil changed, no change.

DOEs this sound like failing EZL?

That actually sounds like the symptoms of a failed crank position sensor. This is common on the M112 engines - not sure how it is on your engine.

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Prost!

No, it's not normal. The EZL does not allow vacuum advance at idle and idle timing is fixed by the EZL and cannot be adjusted. In fact I block mine for emission testing and the idle remains at 700 in neutral (five-speed manual trans). Idle is sensed by a switch on M103s and there is a connector on the top of the inlet manifold forward of the fuel distributor that allows you to easily test it.

The rate of spark advance with engine revs is established by the R16/1 resistor. Removing the resistor creates the most aggressive ignition advance curve with RPM, which will yield best performance and fuel economy, and replacing the resistor with a shorting plug is the least aggressive, which will improve emission test performance.

The location of the R16/1 varies by model... inside side of the battery compartment on 201s, and I think it's located near the master cylinder on 124s... not sure about 126s.

Search for threads started by me about ten years ago for more information on the above and the effects of various changes, especially on EGT and emission test performance.

Duke