I have exhausted myself looking for causes for my lost performance.
new parts...
air filter, and both fuel filters
I inspected vacuum hoses for possible leaks.
I have plugged vacuum line coming from EGR valve and also
placed a solid metal gasket for EGR just in case.

I have noticed that the transmission isn't down shifting as I remember. Climbing hills is almost dangerous with no kick down
unless I force passing gear.

I havent checked the fluid level or color yet..the trani was serviced with Amsoil ATF @ 92k and now has 130K.

Any comments or suggestions appreciated!

PS
I have searched the boards, and tried the possible fixes mentioned for loss of power. I havent been able to find any info
on the transmission.

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Wayne Jockers
1992 300D

The blocked EGR is likely the cause of lost power. The engine control computer senses the lack of EGR and cuts power. Lots of info about that in the Diesel Discussion area.

(edit) For instance, here.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

rick,

Thanks for the reply but the egr was plugged because of several posts I read here.

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Wayne Jockers
1992 300D

The year is important. Lots of people recommend it on the earlier ones, but starting with the 2.5 (1990 I think) the computer cuts the engine power when it detects a fault with the EGR.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

im going to ck the link that u sent and see what it says

Thanks

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Wayne Jockers
1992 300D

Check the bowlen (sp?) cable adjustment.
Amsoil is not a recommend oil for Mercedes (or for any other car as a matter of fact.) Amsoil does not even have a API certification.
jackd

In section 0010/62 of the shop CD, it is said :

«The ARF system with vacuum transducer, switchover valve (as of Model Year 1992), ARF valve, air flow sensor and EDS control unit operates as a closed loop»

So I guess that any alteration of a component in the loop will have an impact. For instance, the vacuum transducer of that loop controls the boost pressure. If the EDS detects something wrong, there's a good chance that he will kill the boost to protect the engine. That's theory.

For the moment I can't verify this because I have a faulty transducer that generates a fault code and cuts vacuum to the boost pressure control.

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DR
1992 300D 2.5T 351 000 km