So today I had an early morning misfire on cyl 8. Cleared it, drove it, and got misfires right away on 2, 4, 6, and 8, along with P0300 and P1300. It's raining today. Interesting that its all on one bank. Before I just go ahead and order new coil packs, wires and plugs, ...thoughts??
I searched, but as always I come up short. Seems NGK plugs are favored here, but what part #?
Also it seems the Standard brand coil packs are liked. Wires?
Thanks

 

As I have written here dozens of times, misfires all on one side of the engine points to the need to replace the upstream, or front, O2 sensor. It happened to me a few years ago. There were no O2 sensor codes but a new O2 sensor solved the problem. If you want to test that solution before buying an O2 sensor just swap the O2 sensors from side to side and see if the misfires follow.

It makes no sense that a problem with your plugs, wires or coils would cause four misfires all on one side to show up on the same day. The O2 sensor is the only thing shared by all four cylinders on one side of the engine.

 

I just replaced all four Bosch O2 sensors a little over a week ago. Along with new plugs.

 

OK, so is this the only thought on this. Yes, makes perfect sense, but could that new O2 sensor go bad like that so fast?

 

Unfortunately, yes...

 

Yep. That too has happened with my truck. More than once.

 

I'd swap coil packs from side to side. It's a free test. If the misfires swap to the other engine bank then they followed the bad coil pack.

Then you just replace that 1 coil pack.



Is there a sensor that detects misfires? Knock sensor maybe??

 

Any chance 1 coil pack is getting wet?

 

The packs fire two cylinders on either bank. If a pack was bad it would be misfiring on both sides not one.

 

Good point.



OK. Swap O2 sensors from side to side to see if the problem follows one.