Miss fire cylinder 2

[Phil21502]

Today my truck through a code for miss fire cylinder 2. I cleared the code and it has been fine since. There was a lot of moisture in the air and I got gas at different spot this weekend idk if that could do it? Like I said it's fine since clearing the code. It's back to chirping second gear. Lol. It's the truck from my sig. Thanks

 

[Dodge4x4810]

How many miles are on your truck? If it was bad gas it should be misfiring on most, if not all, of the cylinders. I just did the plugs in my moms 2012 jeep grand cherokee. It had a skip on one cylinder that would throw a code every couple days. The plugs were junk after 70k miles. Going by the color/condition of the plug, the engine was running normal. But it wore away the electrode, making the gap larger.

 

[SouthTexan]

Yeah, I would recommend checking the gap anytime you throw a misfire code like that. Normal operation will make that gap larger over time due to wearing down the electrode and heat/cool cycles so they will need to be regapped to the proper specs or replaced.

 

[Phil21502]

Like 24,000 miles on truck

 

[Dodge4x4810]

You definitely should not need plugs yet. You do have a tune though. Was there any experimenting with timing or whatnot? Also, you said it happened a day when there was a lot of moisture. The moisture could be getting into on of the circuits associated with cylinder 2, making it misfire until the circuit dries out.

 

[MADDOG]

Has it been sitting for a while?

 

[Phil21502]

Only over night. I had just installed another tune. It's one I ran for months tho without issues. I'm gonna go with moisture unless it happens again. I was really hammering on it when it happened.

 

[Hemi395]

One time when I put a tune on my truck it just didn't feel right. Idled rough, had a hesitation when your first hit the accelerator, shifted kinda sluggish, etc. I reflashed the tune and it was fine. It's the only time its ever happened but you might have had a similar thing happen with your tune, only it showed up as a cylinder 2 misfire. I would imagine if it were a mechanical problem the code would have come back immediately.

Do you have a Trinity? If you you can set up the monitors to look at all 8 cylinders for realtime misfires as you drive.

 

[Phil21502]

Just the intune 2. It's been ok the rest of the day. Running damn good actually. Idk what's up with it. We will see tomorrow after it sits tonight

 

[SouthTexan]

I would imagine if it were a mechanical problem the code would have come back immediately.

Not necessarily. Pushing the engine hard with a tune that advances timing and alters air/fuel ratio to increase cylinder pressure(torque) will a lot of times bring out issues that you would probably not see in normal operation when the ignition system is not being pushed so hard. I had similar issues in past vehicles and had to eventually change to colder spark plugs because the tune would run the spark plug hotter than what it was designed for and it developed hairline fractures like in the picture below. When pushed hard, this caused some of the energy used for a spark to seep through the insulation causing misfires.



This is why I always say check the spark plug when you have a code like that, and are running a tune that alters timing and air/fuel ratios to increase cylinder pressures(torque). You may have to increase/decrease the gap or get colder plugs that can handle the heat and keep up with the tune just like the old racers did back in the day when they increased power.

Spark Plugs: Fact and Fiction

 

[Hemi395]

Not necessarily. Pushing the engine hard with a tune that advances timing and alters air/fuel ratio to increase cylinder pressure(torque) will a lot of times bring out issues that you would probably not see in normal operation when the ignition system is not being pushed so hard. I had similar issues in past vehicles and had to eventually change to colder spark plugs because the tune would run the spark plug hotter than what it was designed for and it developed hairline fractures like in the picture below. When pushed hard, this caused some of the energy used for a spark to seep through the insulation causing misfires.



This is why I always say check the spark plug when you have a code like that, and are running a tune that alters timing and air/fuel rations to increase cylinder pressures(torque). You may have to increase/decrease the gap or get colder plugs that can handle the heat and keep up with the tune just like the old racers did back in the day when they increased power.

Spark Plugs: Fact and Fiction

Wow never thought of that but it makes perfect sense...

 

[Phil21502]

Truck was fine again today and I'm really starting to like this new exhaust I thought I hated. So much more low end torque compared to my single 3 with aero turbine