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I'll mention this again. On the old Benz diesels the injectors would open at about 1800 PSI (no computer controls whatsoever). As they aged that pressure would gradually drop off. At one of the dealerships I worked at we had a tester. We found that the pressures would get down to say 1400-1500 PSI and the car smoked terribly. The lower pressure did not allow for proper atomization of the fuel. All we had to do was replace the springs in the injector assemblies and the pressure jumped back up to 1800+ PSI and the difference was night and day. You can shim the springs in the nozzles to raise the break off pressure even higher. Since 1800 was the recommended top pressure we never messed with the shims, just replaced the springs.
Benz also recommended Red Line diesel fuel treatment back then but that was 30 years ago.
regards
Mech
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