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Found an old service manual that had me second guessing modern diagnostics

Was cleaning out a shop in Des Moines last month and found a 1987 Cummins manual. It had a full section on adjusting injector timing with a dial indicator and a protractor. I knew old school stuff was slow, but seeing it spelled out step by step made me wonder if we lean too hard on laptops now. How many of you still know how to set timing manually without a scan tool?

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alex_johnson2mo ago

Used to be all about chasing down wiring gremlins with a multimeter myself. Then I grabbed one of those old manuals at a swap meet, not even for my truck, just for the pictures. Reading through that timing procedure really got me. Watching someone line up a protractor and spin a dial by feel made me realize how much trust we put in software that we never actually see work. Now I'm not saying we should go back to the stone age, but I get why the old guys call a scan tool just another tool, not the whole answer.

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