I've got a 91 Dakota 4WD with the 318 TBI motor in it with 220K miles. Not only is the motor getting long in the tooth, but it didn't start out as the best when compared to a Magnum. So, decided I would do a Magnum swap and improve it both in wear and design.
When I bought the motor, I though it would be as simple as using a 93 Ram PCM to run the 5.9 with a 92 Dakota engine compartment harness. Then I discovered that the Rams went to a 3 wire speed sensor in 93 while the Dakota's waited until 94. Add to that, the Ram had two O2 sensors while the Dakota only one. Now, neither of these is all that hard to figure out, unless I am missing something.
My plan is to:
1. Rewire the harness to use a 3 wire speed sensor by splicing in a sensor feed from the CPS. The other wires should be good to go.
2. Splice a wire into the speed sensor wire circuit and run it to the bulkhead connector and into the cab and up to the instrument cluster.
3. Re-pin the instrument cluster plugs to match a 94-95 instrument cluster and swap in an electronic speedo cluster.
4. Splice in a second O2 sensor plug and run a wire back to the PCM.
I have an early return style fuel rail, so I think fuel is covered, plus most of the rest of the OBD1 stuff (intake, TB, exhaust manifold, etc.) minus the 5.9 injectors.
I have printouts of the wiring, still working on verifying everything though.
My question is...what don't I know I don't know? Am I missing something that will make this a huge science project? Am I correct that the engine compartment harness from the 92 should plug into my 91 without issues?
Been all over the internet looking for a similar swap and came up blank so thought I would ask.
Thanks.
When I bought the motor, I though it would be as simple as using a 93 Ram PCM to run the 5.9 with a 92 Dakota engine compartment harness. Then I discovered that the Rams went to a 3 wire speed sensor in 93 while the Dakota's waited until 94. Add to that, the Ram had two O2 sensors while the Dakota only one. Now, neither of these is all that hard to figure out, unless I am missing something.
My plan is to:
1. Rewire the harness to use a 3 wire speed sensor by splicing in a sensor feed from the CPS. The other wires should be good to go.
2. Splice a wire into the speed sensor wire circuit and run it to the bulkhead connector and into the cab and up to the instrument cluster.
3. Re-pin the instrument cluster plugs to match a 94-95 instrument cluster and swap in an electronic speedo cluster.
4. Splice in a second O2 sensor plug and run a wire back to the PCM.
I have an early return style fuel rail, so I think fuel is covered, plus most of the rest of the OBD1 stuff (intake, TB, exhaust manifold, etc.) minus the 5.9 injectors.
I have printouts of the wiring, still working on verifying everything though.
My question is...what don't I know I don't know? Am I missing something that will make this a huge science project? Am I correct that the engine compartment harness from the 92 should plug into my 91 without issues?
Been all over the internet looking for a similar swap and came up blank so thought I would ask.
Thanks.