I recently installed an MSD 5900 Blaster ignition and an 8202 Blaster 2 coil on my carbed Dakota V6. I now have a slight shudder on moderate to heavy acceleration from a dead stop. Light acceleration gives no problem. With the MSD ignition removed and using just the Blaster coil or the stock coil, I have no problem. All the other ignition components are fairly new.
I tried advancing the timing by 2 and 4 degrees and retarding the timing by 3 degrees, but that did not eliminated the problem.
The wiring is all correct according to the MSD schematics. Funny side note - while checking the Chrysler service manual for this truck, I found the ignition coil wired backwards in the wiring diagram for the
3.9L spark advance system. It shows the negative terminal of the coil wired through the ignition switch to the positive terminal of the battery. The same diagram for the 2.2L engine shows it wired correctly.I wonder what would happen if the coil were wired backwards... wouldn't that just reverse the flow of current through the plugs?
anyway...
The spark advance on this truck is computer controlled, and since I swapped out the original feedback carb with the non-feedback variety due to not being able to get a replacement mixture solenoid, the only thing that the computer controls is the ignition advance.
I put a message up at the MSD board, but they are all on vacation until Jan 5th, so I thought I might see if anyone here has any insight on this problem.
Jack