Yesterday I replaced all of my injectors. I have 278,800 mi. on the 82 300SD. I have been wanting to do this for awhile to see if I got better fuel economy. My old injectors were not nailing and were doing fine. Smooth idle.

Replaced all five with one that were rebuilt by a knowledgable person some here may have done business with. Torqued to 60 ft pounds and used new heat sheilds that he supplied with the rebuilt injectors (sheild-crush washer had smaller diameter hole than original MB seal to keep more heat off the injector nozzle). Cleaned openings where injectors insert and inspected visually. Are these the pre-chambers?

One of his injectors started nailing right off the bat. Pulled it and put one of my old ones back in that cylinder till he could send another one. No more nailing. Very noticeable increase in throttle response and power. Did have some idle shake that I did not have before this. My engine shocks and mounts are new. Could the rebuilt injectors with better spray pattern be showing up a pre-chamber crack that was not noticable issue before?

Drove 12 miles home on the interstate. Car was running 95-98 degrees. Last summer I had fan clutch replaced as well as thermostat and coolant flush with MB coolant at dealer - no problems since then till today. Popped hood when got in driveway at home and coolant was boiling in expansion tank. No such problems with old injectors.

Drove again yesterday. Had to turn on heater. Immediately a temp drop occurred when heat was turned on inside the car to the proper 87 degrees.

I guess I could repull all injectors and put my old ones back in and run it to see if the new ones are the problem. Is this coincidence or a problem with the rebuilt injectors or a pre-chamber issue? I do not have a pre-chamber tool to remove them.

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1982 300SD Light Blue
2002 Honda Accord SE
1974 Toro Wheel Horse Tractor
2000 Toyota Tundra Pickup