LH-jetronic Trim Plug (not EZL)

[pagodino]

Hi,
anybody has the real meaning of the 7 positions of the Trim Plug of the Jetronik, is ist the same as the KE code or is ist different.

As I made the manual conversion I want to see if there is a possibility to adapt the LH a little better to the manual tranny.
In Position 1 the idle is a little high, seem that in position 2 and 4 this is better. In Position 4 the pick-up in 4th is not as brilliant ans in position 4 or 7. In position 7 the consumption is higher! The problem is that any time you change the posision you have to make a longer drive to give the ECU do equilibrate.

Any idea how the injection-diagrams differs in the different positions?

Best Pagodino

 

[gsxr]

Re: LH-jetronic Trim Plug (not ELZ)

Folks, he is asking about the LH trim plug, not the EZL trim plug. I believe the LH trim was only used on non-catalyst models, without lambda control (no O2 sensor, fully open-loop system). However, the EPC shows a different LH trim knob for both with and without catalyst. I've never been able to obtain detailed information on the LH trim positions. It is for idle speed CO correction... nothing to do with ignition timing.

http://www.w124performance.com/docs/mb/M119/LH_Ref_Resistor0.pdf
http://www.w124performance.com/docs/mb/M119/LH_Ref_Resistor1.pdf
http://www.w124performance.com/docs/mb/M119/LH_Ref_Resistor2.pdf
http://www.w124performance.com/docs/mb/M119/LH_Ref_Resistor3.pdf
http://www.w124performance.com/docs/mb/M119/M119_KAT_conversion.pdf

 

[pagodino]

Thank you fot the reply. But I am not talking of the ELZ. Don't know if the US cars had not the second trim plug for the injection. There are 7 positions. 1. Is standart. 2. Is leaner 3. Not drivable. 4. More injection time in middle range. 5 . more fuel in medium high range. 6. All a little rich. 7 . More rich in any rpm.

This is similar to the KE-JETRONIK plug. If tested it this days with my gpl module aon the PC seing directly the differen injection times.

Best Pagodino

 

[500Eboard]

No U.S.-model .036 had this dial.

 

[Christian_K]

See attachment Page2 at the very end. Only Available in german in my WIS

EDIT: It seems the table for the complaints and its remedies are the same as with the KE (CIS-E) Jetronic, which also has this Plug for injection mappings. I know a guy that works for MB and from an internal instruction document he once gave this explanation for the KE (CIS-E) injection, see below i translated it

[TABLE="class: grid, width: 800, align: left"] [TR] [TD]Trim Plug position
[/TD] [TD]Afterstart-Enrichment
[/TD] [TD]Warmup-Enrichment
[/TD] [TD]Acceleration-Enrichment
[/TD] [TD]Whole Fuel-Mapping Change
[/TD] [/TR] [TR] [TD="align: center"]1
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]Stock
[/TD] [/TR] [TR] [TD="align: center"]2
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]Leaner
[/TD] [/TR] [TR] [TD="align: center"]3
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]Richer
[/TD] [/TR] [TR] [TD="align: center"]4
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]Yes
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]Stock
[/TD] [/TR] [TR] [TD="align: center"]5
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]Yes
[/TD] [TD="align: center"]Yes
[/TD] [TD="align: center"]Stock
[/TD] [/TR] [TR] [TD="align: center"]6
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]Yes
[/TD] [TD="align: center"]Richer
[/TD] [/TR] [TR] [TD="align: center"]7
[/TD] [TD="align: center"]No
[/TD] [TD="align: center"]Yes
[/TD] [TD="align: center"]Yes
[/TD] [TD="align: center"]Richer
[/TD] [/TR] [/TABLE]

 

[500AMM]

Is it this plug?

 

[Christian_K]

Is it this plug?

Yes it is....

 

[500AMM]

Yes it is....

Thanks!

It appears that the info in post #2 pointed to the correct trim plug type.

 

[gsxr]

Hi Arnt,

The EZL trim dial was not used on the E500E. The EZL trim dials are marked "EZL-KAT" or "EZL-ECE" as seen in post #2, and this adjusts ignition timing only. Instead of a dial, the EZL on the W124+M119 uses interchangeable plugs with different numbers. The part numbers for the plugs are 015-545-67-28 (KAT), 015-545-71-28 (non-KAT). More details and photos are in the link back in post #2 (click here).

The LH trim dial is different, it is only marked "KAT" (with catalyst) or "ECE" (non-catalyst). The LH trim affects fuel delivery as described in post #6. Dial part numbers 014-545-71-28 (KAT), 014-545-70-28 (non-KAT). Interestingly, the EPC shows these as "KE" instead of LH. Note these fuel trim dials do not have the "S" and "N" markings.

 

[gsxr]

Shown below for reference only... the EZL trim dials were used on older W124 models with M102/M103 engine.

These were NOT used on the 500E, or any 124 with either M104 or M119 engine. The EZL trim dials have the distinctive "S" and "N" markings which are not present on the LH trim dials.

 

[500AMM]

Hi Arnt,

The EZL trim dial was not used on the E500E. The EZL trim dials are marked "EZL-KAT" or "EZL-ECE" as seen in post #2, and this adjusts ignition timing only. Instead of a dial, the EZL on the W124+M119 uses interchangeable plugs with different numbers. The part numbers for the plugs are 015-545-67-28 (KAT), 015-545-71-28 (non-KAT). More details and photos are in the link back in post #2 (click here).

The LH trim dial is different, it is only marked "KAT" (with catalyst) or "ECE" (non-catalyst). The LH trim affects fuel delivery as described in post #6. Dial part numbers 014-545-71-28 (KAT), 014-545-70-28 (non-KAT). Interestingly, the EPC shows these as "KE" instead of LH. Note these fuel trim dials do not have the "S" and "N" markings.

Aha – so that's the details on this, many thanks for the info!

(post #2 deleted)

 

[Christian_K]

I think this might come handy for the ported heads and reground camshafts im currently preparing, when thinking about it.
IIRC Bernard told me that a LH-Jetronic car like ours has to get a different ECU mapping when doing camshafts and headporting job, as it will run leaner when under acceleration or WOT. But if i put the switch to position 7, maybe it will help. Will see it, most likely i will install a wideband AFR meter into the ashtray. But thats a different topic i'll open soon.

 

[500AMM]

I think this might come handy for the ported heads and reground camshafts im currently preparing, when thinking about it.
IIRC Bernard told me that a LH-Jetronic car like ours has to get a different ECU mapping when doing camshafts and headporting job, as it will run leaner when under acceleration or WOT. But if i put the switch to position 7, maybe it will help. Will see it, most likely i will install a wideband AFR meter into the ashtray. But thats a different topic i'll open soon.

Are you going to install something to monitor the EGT too?


-a-