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Going idle first start up of the day

T

Theodore

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Joined
Apr 1, 2021
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Genesis Model Year
2014
Genesis Model Type
Equus (2011-2016)
My 2012 3.8 Premiere Genesis sedan feels like it’s
running on five cylinders for the first 15-20 seconds.
 
Is it throwing a code? I’m assuming you are getting some vibration you feel with a rough running engine? At start up I think the ECM has not fully taken control of engine sensors until certain sensors come on line with warm up. We run on a somewhat pre-programmed start up routine for the first 30 seconds or so and then sensors and ECM takes over for engine management. Sounds like once yours comes online, your engine settles down? Check plugs to see how they look. If your not getting a code for misfire or something and your plugs still look good, not sure what the issue might be? Could just replace all plugs and get that out of the way as a possible problem.
 
pulsar said:
Is it throwing a code? I’m assuming you are getting some vibration you feel with a rough running engine? At start up I think the ECM has not fully taken control of engine sensors until certain sensors come on line with warm up. We run on a somewhat pre-programmed start up routine for the first 30 seconds or so and then sensors and ECM takes over for engine management. Sounds like once yours comes online, your engine settles down? Check plugs to see how they look. If your not getting a code for misfire or something and your plugs still look good, not sure what the issue might be? Could just replace all plugs and get that out of the way as a possible problem.
Click to expand...
No codes. Think you’d be right about the start up routine.
Thanks for the feedback👍
 
Theodore said:
My 2012 3.8 Premiere Genesis sedan feels like it’s
running on five cylinders for the first 15-20 seconds.
Click to expand...
What do you mean? Like it vibrates more and idle RPM is higher than usual normal? My Gen first couple minutes idle rpm is above 1000!

I have a Nissan 3.5SL that sometimes could only starts on 5 cylinders and throws code. The ride would be really rough. Weirdly it's only sometimes. I just erase the code, let it warm up well and back to normal.
 
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