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Is this “misfire” strong uneven vibrations being felt shortly after cold starting? If so, then my 03/19 build has this. When the engine turns on for the first time and is cold, the engine seems to put off strong vibrations and shakes some in its mounts. It’s felt through the steering and the floor, particularly when I have the wheel turned completely to one side. It definitely doesn’t feel smooth or normal to me as it feels like something is off balance.
I came across this 'engineering' description of advanced engine mounts used on all Honda models including the Insight. So given the Insight's front-wheel drive, it has the standard inertial-axis mounts. Is there any way to tell if the Insight has the other two features... and whether one or all of them can be attributed to the 'misfire' observation when car is idling (?).
  • All front-wheel-drive models have inertial-axis mounts.
    • Honda engineers used computer analysis to determine their optimum location.
    • They effectively control engine vibration over a wide range of engine speeds.
  • An electronically controlled engine mount is used on select automatic transmission-equipped models, which helps damp engine vibrations at varying engine speeds.
  • Another design found on select models is the Honda liquid-filled engine mount.
    • This innovative design uses engine vibration to pump fluid from one chamber to another within the mount.
    • This alters its damping frequency in response to changing engine rpm.
 

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Experienced the first 'misfire' / engine vibration for the season, when ICE started when car was powered on yesterday due to colder (57F) temps. Still only felt it while car was idling, and maybe (?) a little less pronounced than I remember from last fall/winter season.

Since it hadn't happened in so long, I forgot to ask dealer to check this out while in for recent service... and it will be another year (final year of warranty) before I need scheduled service. I'm also not 100% sure how to tell dealer service to replicate (i.e. cold engine, first time ICE starts while idling?). It doesn't occur for me if the ICE is running but the car is in motion (vs idling).

I still hope to answer whether it's a design defect in the engine mount, or just something loose...

EDIT: I double checked warranty documentation, and things like 'engine mounts' and 'engine control module/ECM' fall under the powertrain limited warranty for 5yr/60k (versus base warranty of 3yr/36k)
 

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Experienced the first 'misfire' / engine vibration for the season, when ICE started when car was powered on yesterday due to colder (57F) temps. Still only felt it while car was idling, and maybe (?) a little less pronounced than I remember from last fall/winter season.

Since it hadn't happened in so long, I forgot to ask dealer to check this out while in for recent service... and it will be another year (final year of warranty) before I need scheduled service. I'm also not 100% sure how to tell dealer service to replicate (i.e. cold engine, first time ICE starts while idling?). It doesn't occur for me if the ICE is running but the car is in motion (vs idling).

I still hope to answer whether it's a design defect in the engine mount, or just something loose...

EDIT: I double checked warranty documentation, and things like 'engine mounts' and 'engine control module/ECM' fall under the powertrain limited warranty for 5yr/60k (versus base warranty of 3yr/36k)
Mine does this pretty much every cold morning, I start it with the starter as i am walking out to it and then wait for it to go away before i move the car. Any movement makes it worse. What in the world is it lol?! It scares me bc it sounds like rod knock from a warn motor.
 

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Mine does this pretty much every cold morning, I start it with the starter as i am walking out to it and then wait for it to go away before i move the car. Any movement makes it worse. What in the world is it lol?! It scares me bc it sounds like rod knock from a warn motor.
I wish I knew. Seems to only be in cold weather, didn't experience it during summer. And I'm not sure if it's reassuring (consistent?) or alarming (unresolved?) that after 120k miles, you still experience this issue.
 

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I wish I knew. Seems to only be in cold weather, didn't experience it during summer. And I'm not sure if it's reassuring (consistent?) or alarming (unresolved?) that after 120k miles, you still experience this issue.
Well, whether it's fortunately or unfortunately, something tells me i'll be the first one to find out haha. I tried to send the question to Scotty Kilmer channel but it didn't get seen. I'm hoping it's normal for Atkinson cycle engines. In one of his videos he addressed a question from a viewer with a regular engine and said it is rod knock and means the engine is starting to wear out but it can still last years until it knocks all the time. I learned a lot from that quirky guy's channel!!
 

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Well, whether it's fortunately or unfortunately, something tells me i'll be the first one to find out haha. I tried to send the question to Scotty Kilmer channel but it didn't get seen. I'm hoping it's normal for Atkinson cycle engines. In one of his videos he addressed a question from a viewer with a regular engine and said it is rod knock and means the engine is starting to wear out but it can still last years until it knocks all the time. I learned a lot from that quirky guy's channel!!
Ha, yes - Scotty Kilmer is pretty entertaining and informational. But if this were a common issue, I'd think Prius owners would have complained about it already. Plus all Insight owners (versus just a few) that notice/mention.

Engine mounts sounded like a promising lead from Car & Driver, but they never closed the loop on that before ending their long-term test.
 
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