89 300CE Please help identify engine component

[Texholdem]

Hi all,

I am still unfamiliar with my 1989 300CE, W124.050, engine 103.983.
This afternoon I removed the air cleaner and took a picture of what underneath.
I have numbered the engine components, most of which I don't know nothing about.

Please could you provide the names of them, just what you know.
All inputs are greatly appreciated. Please scroll to the right if the pix is too big for your screen.

That much I know or I think I know , please fell free to correct


1) a thermo vacuum valve, also controls the fuel tank purge for the charcoal canister
2) aux fan sensor
3) Coolant Temperature Sensor
4) Fuel injector
5) cold start injector
6) electrical connector for #7
7) idle control valve
8) Fuel distributor
9) EHA
10) throttle linkage for cruise control actuator
11) vacuum to trans modulator (corrected, did not notice earlier)
12) Intake magnifold (one of six)
13) Bowden cable to transmission
14) Oil filter
15) electrical plug for throttle position sensor
16) fuel return to tank
16a) fuel mixture enrichment
17) fuel injector line 1 of 7 ( 7 is to cold start injector)
18) Fuel line to distributor
19) fuel dampener (often mistaken as a fuel regulator)
20) throttle air flow sensor plate
21) throttle cable to accelerator pedal
22) vacuum source for climate control and economy guage
23) brake booster hose connection
24) fuel return, see #16 and #19

info provided by Carson357, richard28 and Falsapartenza -

Thanks a lot from a newbie.

[blueeagle289]

My 92 is basically the same, but I don't recognize some of those numbered parts either ... interested in the answers in some cases.

[Texholdem]

Hi blueeagle,

your 92 300CE has the newer engine M104, with 24 valves I think.

[Falsapartenza85]

Item#21 is the kick-down (bowden cable). When you accelerate hard (pedal to floor) this cable ensures that the transmission kicks the gears into appropriate 1st or 2nd gear to move quickly.

[Carson357]

note corrections



1) sensor for fuel tank charcoal canister purge
2) aux fan sensor
3) Coolant Temperature Sensor
4) Fuel injector
5) cold start injector
6) electrical connector for #7
7) idle control valve
8) Fuel distributor
9) EHA
10) throttle linkage for cruise control actuator
11) vacuum to trans modulator (corrected, did not notice earlier)
12) Intake magnifold (one of six)
13) Bowden cable to transmission
14) Oil filter
15) electrical plug for throttle position sensor
16) fuel return to tank
16a) fuel mixture enrichment
17) fuel injector line 1 of 7 ( 7 is to cold start injector)
18) Fuel line to distributor
19) fuel dampener (often mistaken as a fuel regulator)
20) throttle air flow sensor plate
21) throttle cable to accelerator pedal
22) vacuum source for climate control and economy guage
23) brake booster hose connection
24) fuel return, see #16 and #19

[lee polowczuk]

spoken by someone who really knows the 103. thanks, i feel like i went to school today.

[Texholdem]

Wow, The list is complete! Thanks Carson.

[Carson357]

Originally Posted by Texholdem

Wow, The list is complete! Thanks Carson.

no problem glad i was able to assist.

[brewtoo]

OK, what are the yellow things with the white tie-wraps?

[Texholdem]

The 2 yellow thingies and the red one are magnets, supposed to increase fuel efficiency . But I don't see any improvement at all.

[chealeana]

Hey! I'm trying to replace my aux fan switch and I can't find it... google is no help and sadly this was the only picture with mention of showing a location but unfortunately it comes up with "403: forbidden" when I try and look 😭 Can someone please help me out?