Вот еще аналогичная проблема с караван-форума:
Hope this helps somebody some day.
97 caravan 3.8 developed a hard bucking problem that got worse with time.
Had the P1391- loss of cam or crank signal
Changed both plus the coil pack and plugs and wires.
Hooked up a dual trace scope to the cam and crank sensors and they looked good and were in proper time so I figured flexplate was good.
A week later I had the scope hooked up again but at night so I could really see the traces and saw random spikes on the cam signal. Figured out they were happening when the coil was firing. (thats when I changed the pack and plugs and wires)
Saw in another thread here about signal noise created by the alternator so I disconnected the field wires and that was it.
New alternator and problem solved.
A bit of irony here: I had installed that alternator in a misguided attempt to fix a different problem a few years ago.
Те же симптомы, шум из генератора. Заменил, все прошло.
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