![]() Diesel specialists who have a lot of experience with the ISB believe the issue is the in-tank diesel lift pump wearing out prematurely, or providing inadequate pressure. The VP44 diesel injections pump often starts showing issues around 150k miles. The 24v trucks make more power and produce fewer emissions than the earlier 12v but aren’t quite as reliable. This engine used the same basic bottom end, but has a 24-valve head rather than the earlier 12-valve for better breathing and higher compression, and uses a Bosch VP44 rotary injection pump for more precise fuel control. Halfway through the 1998 model year, Dodge switched from the Cummins 6BT to the ISB. Both of these are fairly reliable at stock power levels, if a little bit limiting and inefficient. 1989-1993 trucks use a Bosch VE injection pump, and 1994-1998 12v trucks use a P7100. While all Ram Cummins from 1989-2007 use the Cummins 5.9, there are still variances with the turbochargers and the fueling systems. ![]() Buyers really responded to the big-rig inspired styling sales went from 95k units in 1993 to 410k in 1995. The 1994 redesign was the first attempt by one of the big three to make their pickup actually stylish, rather than simple and cheap. The Cummins 6BT engine in the Ram was miles ahead of the Detroit Diesel 6.2 in the GM pickups or the Ford IDI, featuring direct injection and a turbocharger. The first Ram Cummins was released for the 1989 model year, technically before the D/W pickups were even called the Ram. The Dodge Ram Cummins is the main reason that diesel pickups are so popular today.
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