hello team,

this is my first post and iam looking for help in my 300SEL 1989 W126

can you team explain about this part "PIERBURG 7.21071.50"

what is it ? and how to connect it (wih pictures plz) ?

thanks

h:

If you would provide pictures of the valve, and indicate its location on the car, folks here may be able to help you.

thanks really for trying to help
kindly find valve picture

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friend its located near ECU and ABS
i will take pictures tomorrow ....

look friend its a big challenge here because we dont have professionals around here in 3rd world country
show it to 10 mechanics no one have idea how to hooked up

also find it on w124 and w201 but different locations

thanks in advance

This is a vacuum switchover valve. One port is connected to the vacuum source, and the vacuum is directed to one of the other two ports, depending on whether or not 12V is applied across the electrical contacts. These are generic, and have many applications depending on year and model. Most commonly used to control the EGR valve. In Diesels, there may be three or four of these with various functions.

really thank you for helping me
yes yes i have one line (upper one) connected from source
second line (side one) not connected to anything
third line (bottom) line missing

were i can find EGR valve?
i have 300SEL 1988 with M103 engine

You'd be best off submitting that question to a model-specific board, I'm not familiar with your car. EGR valves connect the exhaust and intake manifolds. They usually have one vacuum port at the top. The associated vacuum switchover valve could be anywhere in the engine compartment, so that's not much help.

The EGR valve on the M103 engine in your 300-SEL is on the passenger side of the engine around cyl 3(approx.) - I will try to locate a web photo or one in my stash and post it.

This site won't allow posting any photo that has any size to it, so this is the best I can do. It's located where I mentioned up above:

https://www.pelicanparts.com/catalog/SuperCat/3368/MBZ_3368_EXHPIP_pg2.htm#item5

__________________
Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"

thanks Mr. Mike
i will search for it today and take pictures so you can help me reconnect everything

Hope this helps .

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or this one with numbers .

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Hyassin try this . Google - Mercedes Benz Model 124 - M103 Maintenance Manual .

Then pick your engine M103 then click on number 14 for . Intake manifold emission control .

thank you my friend
i will check all my lines today and take some pictures
i will keep you posted
thanks again

i was very rainy rainy today could not work and take pictures

but !!!!

i found this sticker on the power cable for the switch/valve

number seen : 126 540 1813
and the rest is German language

is this helpful ?

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