Misfire in Cylinder 2...

[guitarjesus]

Woke up today to a misfire in cylinder 2 in my 2019 1500. I did the basics of trying to get to the bottom of things. I only have 65k miles on it.

1. Swap cylinders 2 and 4 coil plugs, still a misfire on cylinder 2.
2. Put in new spark plugs, still a misfire.
3. Disconnect battery, hoping a computer gremlin will get erased, no dice.

If it's something besides coils or plugs, what are the common reasons to get misfires from these engine?

 

[Rick3478]

Woke up today to a misfire in cylinder 2 in my 2019 1500. I did the basics of trying to get to the bottom of things. I only have 65k miles on it.

1. Swap cylinders 2 and 4 coil plugs, still a misfire on cylinder 2.
2. Put in new spark plugs, still a misfire.
3. Disconnect battery, hoping a computer gremlin will get erased, no dice.

If it's something besides coils or plugs, what are the common reasons to get misfires from these engine?

First question, is something actually broke or is it just mis-reporting?
Is it actually limping/stuttering? Broken valve spring or collapsed lifter can do that.

 

[theblet]

Woke up today to a misfire in cylinder 2 in my 2019 1500. I did the basics of trying to get to the bottom of things. I only have 65k miles on it.

1. Swap cylinders 2 and 4 coil plugs, still a misfire on cylinder 2.
2. Put in new spark plugs, still a misfire.
3. Disconnect battery, hoping a computer gremlin will get erased, no dice.

If it's something besides coils or plugs, what are the common reasons to get misfires from these engine?

Just curious what led you to investigate this. Is it running bad? Check engine light?

I would try different fuel, injector cleaner. Or swap injectors around.

Also, I’ve seen some misfire counts for my truck in Jscan. They are few and far between in closed loop before the engine gets to operating temp.

 

[guitarjesus]

It's a constant misfire in cylinder 2. The misfire count for "current drive cycle" is in the hundreds just after starting it up.

 

[guitarjesus]

Just curious what led you to investigate this. Is it running bad? Check engine light?

I would try different fuel, injector cleaner. Or swap injectors around.

Also, I’ve seen some misfire counts for my truck in Jscan. They are few and far between in closed loop before the engine gets to operating temp.

In the 100's, not random. It's continuous.

 

[theblet]

In the 100's, not random. It's continuous.

Running bad or low on power? Trying to think if maybe it’s a false positive somehow

 

[guitarjesus]

Running bad or low on power? Trying to think if maybe it’s a false positive somehow

Engine shakes, running rough. Not even trying to do more than move it out of the driveway. It's going to the dealer today

 

[HSKR R/T]

Sounds like a bad lifter, or possibly fuel injector if you didn't swap those.

 

[guitarjesus]

Sounds like a bad lifter, or possibly fuel injector if you didn't swap those.

lifter or injector would be preferable. it won't be at the dealer for two months for that type of fix.

 

[guitarjesus]

Already talked to a guy at the Ram dealer, he said a few codes come up just plugging it in, but main one was the injector. The diagnostic guys will get to it in a few days.

 

[Autoplay]

I had code for misfire etc at around 60,000 miles. Changed plugs and coil pack,to no avail. Changed out injector,problem solved.

 

[guitarjesus]

Update: it was the injector, fully covered

 

[guitarjesus]

Update #2: literally climbed into the cab, check engine light was still on, thought maybe they didn't reset it. Still was running rough but not like before, now my code reader says cylinder 3 misfire.

I didn't even leave the parking lot man. They're going to do a leak down test. What a effing week.

 

[HSKR R/T]

Update #2: literally climbed into the cab, check engine light was not on, running rough but not like before, now my code reader says cylinder 3 misfire.

I didn't even leave the parking lot man. They're going to do a leak down test. What a effing week.

Maybe they should have replaced all the injectors? Or they messed something up replacing the #2 injector

 

[guitarjesus]

Maybe they should have replaced all the injectors? Or they messed something up replacing the #2 injector

Possible but #3 is on the other side of the engine. So what the hell would they have done to make it fail or stick? Weird

 

[23RAM]

Possible but #3 is on the other side of the engine. So what the hell would they have done to make it fail or stick? Weird

All sorts of possibilities.

At about 6 months and 6500 miles on a brand new truck, I had a misfire issue cyl 5 that was intermittent, some days it ran fine, other days not. First diagnosis was bad coil or plug. Swapped plugs - didn't fix it. They changed the coil - didn't fix it. Changed the injector - didn't fix it. Changed the PCM - didn't fix it. Finally changed the main wiring harness and that fixed it. Took six months in/out at the dealer to finally get it resolved. Seems like a wire or connection was damaged during assembly on the line and it took 6 months of corrosion or wear to affect the connection to the coil pack and then it started to misfire intermittently. After a few months of them trying coil, injector, PCM, it was misfiring 100% of the time and a new harness was ordered. About 12k on it now and still good.

 

[HSKR R/T]

Possible but #3 is on the other side of the engine. So what the hell would they have done to make it fail or stick? Weird

If they pulled the whole fuel rail when they did the injector it would possibly effect both side