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You are watching: 1994 dodge dakota engine 3.9l v6

The Neglected 3.9 V6 dodge Truck EngineThanks come Vince Spinelli, Gabriel Couriel, Dan Stern, Vincent Roberts, and Mark P.The 3.9 V6 to be a close relative of the 318 V8, also keeping the bore and stroke, created due to the fact that the upcoming dodge Dakota needed a V6 engine. Producing a new V6 would have actually taken too lot time and also money.
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On the 1994 Dakota and also Ram, the exhaust manifolds were shrunk come 1 5/8" and also the exhaust was lessened to 2.5" native 3", remove 5 horsepower but no doubt saving some money. The greater effectiveness of the system led designers to drop EGR on the 1996 trucks.In 1997, the 3.9 got sequential multiple-port fuel injection, whereby each injector fires together the cylinder is illustration in waiting (in the larger multiple-port injection systems, the injector often fired versus a closed valve). Aided by a bigger spark plug gap, the system enhanced responsiveness, despite horsepower and also torque ratings remained the exact same as in 1996: 175 hp
Displacement239 cubic inch / 3906 cc
Bore and stroke3.91 x 3.31 (90 level V6)
ValvesOverhead - 12 valves, roller followers, hydraulic lifters
Fuel injection1987: None, Holley carburetor1988-1991: Single-point electronic1992-1996: Multiple-point1997-end: Sequential, returnless multiple-point
ConstructionCast stole block and also heads
Compression ratio9.1:1 (1997)
Redline5,250 rpm (1997)
Fuel 87 octane unleaded regular
Oil, coolant4 quarts oil, 14 quarts coolant
Emissions3-way catalyst, two heated oxygen sensors (1997)
EPA mileage(1997 Dakota)16 city, 22 highway (2WD, hand-operated transmission)15 city, 18 highway (4WD, automatic transmission)



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Common repairs
gimpppa.org forum member Dean C. Found that his 2002 3.9 van would certainly stumble and idle poorly, a few minutes ~ a warm restart. Once the throttle was blipped, the popped; when provided a lot of throttle, it revved and also ran normally. The stumbling lasted up to a pair of minutes; if driven, it would certainly hesitate, sputter, and also pop for number of minutes uneven given complete throttle. ~ a couple minutes, it would be fine till the van was shut turn off for 5-15 minutes. Cold starts were normal.Bob Lincoln wrote that the the 3.9L V-6 often had a vacuum leak in ~ the "belly pan gasket" ~ above the entry manifold, which could cause stumbling and also poor idle ~ a warmth restart, and "pops" as soon as the throttle is "blipped." Bob composed that one more indicator of this problem is oil consumption; the owner can check for black color residue, one of two people wet or dry, at the bottom the the accelerator body."Whitevanguy" included that there have the right to be problems with weak or intermittent grounds resulting in "weird electric issues." poor MAP sensors can additionally cause similar problems.(repair tips | performance tips | the men behind the 3.9 V6: Willem Weertman | Pete Hagenbuch)