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> 99 Durango 5.9L has started behaving really weird. It starts up more or
> less fine (have to crank it more than usual), and will idle fine. When I > floor it under load RPMs won't go over 2-3K, it starts coughing, and idles > very roughly, then stalls (but sometimes will recover to smooth idle). I > hooked up ODB scantool, and all sensors seem to be in working order. > Whenever it starts stalling oxy sensor shows lean mix, and ignition > advance fluctuates wildly between 10-25 degrees. No error codes. I even > reset PCM by disconnecting battery - no joy. > > I'm thinking ignition trouble... had all wires, distributor cap and coil > replaced recently with Accel hi-perf components... could it have something > to do with this??? You guys were all wrong It was the coil No air bubbles in fuel as far as I can tell ) Fuel pump is fine, too. Swapped back OEM coil, and it runs as new. I also measured primary resistance on both coils, about 22Ohms on both... dunno how can I measure secondary winding. My idle is just a tad rough now - which was the reason why I 'upgraded' to Accel in the first place. Now, I wonder how on earth can faulty coil account for smooth idle at first, then spluttering/missing during acceleration, and finally settle down to very rough idle? My only guess would be cross-induction caused by higher voltage... there actually is TSB out for 99 Durango covering ignition wires cross-induction. When I swapped back the original coil voltage went down and cross-induction stoppped. If so, why did it run just fine with Accel for several months??? Peter |
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