Running rough on startup

pablo_max3045

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Germany (ex-pat)
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2019 Rubicon
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Engineering project manager
Has anyone else noticed that the engine is a bit rough upon starting when it's cold outside?
Seems to last only 5-10 seconds and then it's smooth again.
Wonder if it is just mine and something is wrong or normal behavior.
 

Rubi D

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Brett
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Sydney, Australia
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JL Wrangler Rubicon Diesel, Hella Yella
Has anyone else noticed that the engine is a bit rough upon starting when it's cold outside?
Seems to last only 5-10 seconds and then it's smooth again.
Wonder if it is just mine and something is wrong or normal behavior.
I have noticed it once or twice. Only for a few seconds, so figured it was just the ECU adjusting for the cold engine.
 

JLJessieJeep

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Dave
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Australia
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JKUS, JLUR
Has anyone else noticed that the engine is a bit rough upon starting when it's cold outside?
Seems to last only 5-10 seconds and then it's smooth again.
Wonder if it is just mine and something is wrong or normal behavior.
Both my 2.8lt JK and 2.2lt Jl run a bit rough first thing in the morning, usually when below 5 degrees.
I just put it down to a cold engine and cold fuel making it work hard for ignition.
I also have a 2lt Amarok that does it as well.
 

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