From 1984 until late 1995, the DT engines used a Bosch pump-line-nozzle (PLN) mechanical direct fuel injection system. 1984 through 1992 DTs used a Bosch MW style pump, while the 1993-1995s used a Bosch P style pump, and starting what was called New Generation Diesel engine design, which is still the same basic block design. Mechanical injection was still utilized in trucks up into the 1997 year, but this is rare. In 1994, due to tightening emissions regulations, the engines were redesigned to use electronically controlled unit direct fuel injection. From 1994 to 2004, the engines used HEUI (Hydraulically actuated Electronically controlled Unit Injection) injectors, co-developed by Navistar and Caterpillar Inc
You are right on the breakpoint between mechanical and electronic.
GreyCoyote say: The 466 mechanical has an inline pump with six hardlines exiting it and going to the injectors. It has no ECU and no diagnostic connector.
The 466E has a modular pump, with a single high pressure line. It has a sizable ECU mounted on the drivers side of the engine at shoulder height. It also has a valve cover that integrates the intake manifold (ie, there is 4 inch hose coming off the intercooler and going right into the valve cover. It will also have a grey 6 pin diagnostic connector under the dash by the drivers right knee.
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