'84 300D, 385K mi. WVO the past 25K mi. 5u final filtering (has a functioning boost pump). I slowly lost power over a 1K mi period. Did a valve adjust, fuel sys. complete flush-out, filter changes and new monak injectors. Checked for air leaks into fuel sys., none. Checked Turbo waste gate was opperation correctly, yes. Ran straight Dinodiesel the past 20Gal with a bottle in injector cleaner (for 50 gal.) Ran a qt of injector cleaner straight. (this isn't the diesel purge you have, but I just got some and haven't used it yet.) Cold Compression read, 400, 305, 400, 340, 380. Then added oil to #2 & #4 cyl. and both came up to ~500. Thus I though it was bad rings. Then a past MB mechanic buddy suggested a hot comp. test. Did that with the following 410, 380, 405, 385, 405. Now I suspect its the injector pump and not the ring/cyl sidewalls.
Your thoughts?
Thanks, Shawn