2003 Lesabre with miss on 3/6

[SharpRedOne]

My 03 Lesabre just started missing on 3and6 cylinders. I checked the codes and it showed a P0300, cylinder misfire. I checked the coil pack and no fire to plugs, so I replaced that coil pack, but I still have no fire to 3/6 cylinders. I even swapped coil packs and still none on 3/6.
Any ideas as to where to look next?

 

[Lubener]

If you verified no spark out of the coil (and 12v to coil ?), the ignition module under the coil packs likely is bad. I think some auto stores can test these.

 

[SharpRedOne]

Thanks Lubener. I have not checked for 12v to the coil, but the other two coils are firing. I'll check voltage, then see if someone can test the ignition module.

 

[GliderRides]

Agreed, test the ignition module. Had one fail the same way, killed one coil.

Someone posted in the past month, a new ICM had failed after about 30 days. I got my replacement from a junkyard and it's still running, on my old '93, not the 2000.

 

[SharpRedOne]

Just had the ignition module checked and it is bad. Ordered a new module, coils, plugs and spark plug wires off of EBay for $150 bucks. $10 more than the local parts store wanted for a module alone.

Thanks for the advice Lubenre and GliderRides.

BTW; My 03 Lesabre has 225,000 miles on it and still (or will 😛) runs great.

 

[Lubener]

Good idea to change coils too. A shorted primary can damage an ignition module.