ICE Cycling in Cold Weather - 2017+ Chrysler Pacifica Minivan Forums
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post #1 of 52 (permalink) Old 12-30-2018, 11:21 AM Thread Starter
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ICE Cycling in Cold Weather

I wanted to merge threads and see how everyone is doing. Weather lately has been below 40f pretty constant. We're using an extreme amount of gas now. Prior to recall we would run about 65% electric, now we're using about 15% electric. Engine cycles extreme amount or doesn't use electric at all. Extremely annoyed by this.

My experience:
  • Started after recall was completed
  • Only happens in cold weather i.e. below 40f(?)
  • Engine cycles extreme amount, sometimes starts just as fast as it turns off
  • Uses more gas because engine cycling so much
  • Engine cycles while driving
  • Electric sometimes isn't even used and engine runs for no reason at all (i.e. no incline, throttle usage, load, heat load..etc)


Threads I found:

https://www.pacificaforums.com/forum...-behavior.html

https://www.pacificaforums.com/forum...-behavior.html

https://www.pacificaforums.com/forum...ccess-etc.html

Currently I'm working on getting a loaner from a family member or FCA, family of 6 makes it difficult to get to a dealer. I drove the van Saturday, should of been 100% electric and was 8 miles gas, 4 miles electric. Drove it Friday , should of been 100% electric, ended up being 42 miles gas, 4 miles electric (multiple charging stations).

This issue really defeats the purpose of the van, actually i would say at this point with the engine cycling so much probably get worse MPG than a gas model.
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post #2 of 52 (permalink) Old 12-30-2018, 01:26 PM
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Where do you live?
How cold does it get where you are?

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post #3 of 52 (permalink) Old 12-30-2018, 01:58 PM Thread Starter
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Originally Posted by Lipster View Post
Where do you live?
How cold does it get where you are?
Kansas City Suburb , last few days its been high 20's low 30's. Today high 45f. We had the van last winter and never had this issue. Yesterday when I went to the store it was 30f out, van ran 100% gas one direction, and 4miles electric / 2 gas on way back. There is no rhyme or reason to this madness other than below 40f it is alot worse. All this started after the last recall.


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post #4 of 52 (permalink) Old 01-19-2019, 04:30 PM Thread Starter
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So we've sort of figured this out, still haven't had a chance to visit a dealer. Anything below 40f with any HVAC on a/c or heat even with no load ICE kicks on. If we drive without HVAC on, we will stay all electric. Now above 40f, no matter the heat load or a/c load everything is normal and van tries to be all electric as much as possible. I believe with the recall/ecu update someone changed the algorithm to be similar to a non-hybrid pacific. I say this because we had a rental early fall and it would cycle at a light with heat on just like our van is doing now.


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post #5 of 52 (permalink) Old 01-19-2019, 04:58 PM
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Anecdotally the most recent SW seems to have changed PacHy's behaviour. I am seeing much more ICE this year than last year.
It would be great if they actually listed the changes like other SW does.
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post #6 of 52 (permalink) Old 02-05-2019, 03:12 PM
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This is easy to explain, PacHy hates cold weather like me. It's just shivering to keep warm.

Seriously though, this happens to me in the frigid cold and it's really annoying because not only is it loud, you can really feel the van shake. I thought it was due to being at 0% battery and the engine can't decide to stay on or off but it happened with a significant charge.

Also, not sure if I'm a fan of this award winning Pentastar engine. It's kind of "rough" or maybe it's due to something else.
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post #7 of 52 (permalink) Old 02-06-2019, 04:07 AM
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This is easy to explain, PacHy hates cold weather like me. It's just shivering to keep warm.

Seriously though, this happens to me in the frigid cold and it's really annoying because not only is it loud, you can really feel the van shake. I thought it was due to being at 0% battery and the engine can't decide to stay on or off but it happened with a significant charge.

Also, not sure if I'm a fan of this award winning Pentastar engine. It's kind of "rough" or maybe it's due to something else.

The engine is smooth, it's the engagement/disengagement that shakes the car and feels rough. It seems to be a threshold event, where it kicks on and off at fractions of a reading. I have a heating generator on my truck that behaves similarly when very cold out.On/off/on/off every few minutes.
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post #8 of 52 (permalink) Old 02-06-2019, 02:15 PM
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The engine is smooth, it's the engagement/disengagement that shakes the car and feels rough. It seems to be a threshold event, where it kicks on and off at fractions of a reading. I have a heating generator on my truck that behaves similarly when very cold out.On/off/on/off every few minutes.
I agree. And it probably could be re-programmed to be a little smoother. I think itís the heavy load of the Ďgenerator motorí (which charges the HV battery) that makes the engine sound kind of loud. Iím sure that that load can be ramped in after the engine starts and ramped out before itís shut down. I donít know how that would affect efficiency though.

It is true, generally speaking, that starting an engine up repeatedly causes more wear than leaving it running. When the engine has been sitting for some amount of time not running then the oil tends to run out of the places where it needs to be. At the instant you start the engine there is somewhat of a starvation for lubrication until the oil pump kicks in and gets the oil flowing everywhere again. Perhaps the Chrysler engineers realize this and have found that starting and stopping every few seconds is less wear and tear than starting, running for a few minutes, stopping, and staying off for a few minutes. Maybe doing it that way doesnít allow much time for the oil to drain away from the critical places and so itís not so hard (as far as wear and tear goes) on the engine to re-start. Just an idea...

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post #9 of 52 (permalink) Old 02-06-2019, 04:54 PM
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I doubt this start /stop is deliberate. It's likely the threshold is too small, and needs to be widened.

It takes quite a while for engines to be drained of lubricating oil, especially if still warm, not to mention its 0 weight oil. Since there's no starter, the engine gets spun up to speed quickly.

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post #10 of 52 (permalink) Old 02-07-2019, 12:38 AM
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Originally Posted by 1tg1 View Post
I doubt this start /stop is deliberate. It's likely the threshold is too small, and needs to be widened.

It takes quite a while for engines to be drained of lubricating oil, especially if still warm, not to mention its 0 weight oil. Since there's no starter, the engine gets spun up to speed quickly.

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Well, zero weight oil is less viscous and I would think it would actually drain away more quickly. And generally oil becomes less viscous as it heats up. Actually, there is a starter, just not int the conventional sense. Itís one of the two motors that is housed in the transmission.

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