Hi i have a 2001dakota 4.7 replaced the motor with another j-tec the problem is am having is starts right up runs fine 2-3 mins then when drops down to idle starts missing and shaking.. then will start throwing codes all primary coil faults some time 2-3 different cylinders then if I rev it up it smooths out until I let it fall back to idle then will start throwing codes again sometimes all cylinders primary coil faults.. any help please.

Steve

 

Disconnect the front O2 sensors, (if you have more than one....) see if the problem goes away. (it'll still set codes about the sensors though.)

 

still same problem putting out codes P0351, 352, 353, 354, 355, 356, 357, 358. Anything above 1100 rpm will smooth out but when let goto idle starts to stumble and stutter. What i have done to try and fix issue... replaced sparks plugs, replaced coils, replaced all 4. O2 sensors, changed out Ecu/PCM, replaced throttle body, Anything and all help will be appreciated.... thank you

 

Battery cables/grounds? Is it charging well at idle? its a circuit code but not a voltage high/low code, so not sure if its actually a wiring related fault or voltage for that matter.

Knock sensor malfunction?

 

hi ,
voltage is 14.1v at idle.....thanks steve.. still same faults

 

Ok guys really need your help my 4.7 j-tec dakota is still having the same issue.. so starts right up no codes let it run from 1000 rpm and up runs fine no codes as soon as you let it come down to idle around 700rpm it starts to stumble if you let it continue to stay at idle it will start throwing codes for all eights cylinders ( every cylinder primary coil circuit ) all the PO351,352,353,354,355,356,357,358. here is what i have done or TRIED.
*** replaced all coils, all sparks plugs, cam and cranks sensor, cleaned all ground connections, all 4 02 sensors, fuel pressure good, voltage at idle or rmp good, pcm, fuel pressure good, intake air control, idle position sensor, any and all help is welcome i am running out of ideas to try.. oh yeah and if I put any or all of those parts on another dakota it runs fine so that's how I verified parts....

Dakota Doomed
Steve....
( sensors are Tamkken brand, and tried o.e.m. ones as well)

 

what brand sensors are you using

 

tamkken sensors (brand)

 

Never heard of them..... What plugs do you have in there??

 

(NGK Spark plugs)