300D (124.128) L5-2.5L DSL Turbo (602.962) (1991)
Technical Service Bulletin # 14_007
Date: 930301
EGR - Vacuum Transducer Updated
REF.NO.: MBNA 14/7
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: March 1993
SUBJECT:
MODELS 124.128, 126.134/135, 140.134 ENGINE SURGING AT PARTIAL LOAD (50-60 MPH), SMOKING/ROUGH IDLE AFTER START OR
POOR PERFORMANCE
This TSB has been updated by TSB # 147, dated 04/01/93, correcting all the model indicators for the models covered by the S.I. See Parts and Warranty
Information in this bulletin.
General
As of February 1992, a modified vacuum transducer has entered production. The new part can be identified by a black ring, however, the part number
remains unchanged. In case of customer complaints of engine surging at approximately 50-60 MPH, smoking rough idle after start, or poor power output
on vehicles with earlier production dates, the tests in this bulletin should be performed; see Testing.
Testing
Test conditions
^
Engine coolant temperature 60-80~C.
^
Air conditioning system switched off.
^
Selector lever in "Park" position.
Special tool
Pressure control flap test (engine 602 only)
1.
Connect vacuum tester to vacuum actuator (arrow, Figure 1).
2.
Apply vacuum slowly until lever (a) contacts stop (b).
3.
Vacuum reading should be 385 +/- 5 mbar. If necessary, adjust by loosing screws (c) and sliding vacuum actuator (100) in the slots. Release
vacuum and repeat test if needed.
Vacuum pump test