Spark Plug replacement

[Tim_JLU]

So I changed the plugs on my 2019 Sunday. Pretty easy and straightforward. But dang it.
On a cold start I get a slight backfire sound pop pop, only at high idle and goes away after a couple of seconds.
Jeep runs great, no codes, no misses and I am getting 24+ MPG.
Coil pack not all the way seated?
Thoughts?

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[chevymitchell]

So I changed the plugs on my 2019 Sunday. Pretty easy and straightforward. But dang it.
On a cold start I get a slight backfire sound pop pop, only at high idle and goes away after a couple of seconds.
Jeep runs great, no codes, no misses and I am getting 24+ MPG.
Coil pack not all the way seated?
Thoughts?

What part # plugs did you use and what were they gapped to?

 

[Tim_JLU]

NGK 92019 .26 was the gap same as the ones that I replaced.
Like I said this is only on a cold start up at high idle. Runs great other than than.
Maybe I knocked something loose?
I did not even have to unplug the coil packs on cyl no 3 and 4.
I am free tomorrow going to take a better look at it.

 

[Manuel76]

NGK 92019 .26 was the gap same as the ones that I replaced.
Like I said this is only on a cold start up at high idle. Runs great other than than.
Maybe I knocked something loose?
I did not even have to unplug the coil packs on cyl no 3 and 4.
I am free tomorrow going to take a better look at it.

Yesterday I changed the spark plugs on mine and had the same problem in cylinder number 1. It turned out to be the distance at the tip of the electrode, which I must have hit it by accident or it came like that. I put the correct gap and the problem is over. My advice is to check the gap on all 4 spark plugs.

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