The ’98.5 5.9L ISB Cummins was equipped with the Bosch VP44 distributor style rotary injection pump. To meet ever-tightening emissions standards on pickup trucks, Cummins introduced both a 24-valve cylinder head and electronically variable injection timing midway through Dodge’s ’98 model year. It’s a company that has specialized in the ’98.5-’02 VP44 Cummins since it was introduced. Below, we’ll highlight the key causes of VP44 failure and what can be done to prevent it from happening.įor more light reading on diagnosis and functionality of the VP44 from a highly reputable source, visit Blue Chip Diesel. To be sure, the VP44 remains one of the ficklest components to ever grace the legendary Cummins lineage, but there is now an unofficial protocol to follow in order to keep one alive. With knowledgeable diesel mechanics, injection system experts and enthusiasts in that following, all of the VP44’s weaknesses have been exposed, well-documented and some have even fixed by the manufacturer over the years. Needless to say, the VP44 got a bad wrap from the get-go, effectively becoming the red-headed stepchild of the injection pump world.īut despite the VP44’s unpredictable nature and the fact that many prospective Cummins owners avoid them like the plague, it still enjoys a loyal following. It followed a period of time where the fully-mechanical Bosch P7100 aboard the 12-valve 5.9L offered in ’94-’98 Dodge Ram 25s wouldn’t die even if you were trying to kill it. This version of Cummins’ 359 ci inline-six, the 24-valve ISB, came equipped with the Bosch VP44 injection pump-an electronic rotary pump that is notorious for failing unexpectedly. The dead pedal, the long-crank hot restarts, the engine dying suddenly while driving down the road, never to restart again.
MANUAL DE BOMBA BOSCH VP44 INJECTION HOW TO
How to Keep the VP44 in Your ’98.5-’02 Cummins Alive
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