Gas engine cycling is rough

Xabiche · 08-16-2007, 06:34 PM

I have about 1.5k miles on my '07 Touring. Since I got it, it seems that that when the gas engine cycles on/off it is very rough. When I test drove other Prius before buying I didn't notice this, and when I test drove this one I didn't really notice it. But, ever since I bought it I have noticed it. I can understand feeling something when it cycles, but this is really rough. I've been meaning to take in but just haven't yet. Should you normally be able to feel the cycle on/off shake your seat?

Presto · 08-16-2007, 07:00 PM

That's normal. You'll notice it more when the engine is cold.

Neicy · 08-16-2007, 07:36 PM

Wish I had a nickel for each one of us who asks this. I found it to happen every first shutdown in the morning when I first got mine during the winter (Feb). Seems to have decreased with (1) the warm weather, and (2) the "maturing" of the engine, but still sometimes noticable. Just a little quirk with this car. I want to experiment this winter with putting in the engine block heater - bet it will help since the starts won't be so cold. Once you get used to it and all the other little unique noises you will no longer obsess over it. At first I really thought there was something wrong with the engine. There's nothing wrong - it's just unique and takes some getting used to. Now I don't even notice most of the time. Enjoy your car!

**Tideland Prius** · 08-16-2007, 09:43 PM

It'll shut down rough if two conditions are met

- the car is new (mine took forever before it shuts down smoothly. Even now after 56,000kms, it shuts down rough now and then)

- the engine is cold

They've done a much better job with the TCH in terms of reducing vibration when the engine shuts off but with the Prius, it can get violent at times and does not indicate a malfunction. (sound like a owner's manual for a second there lol)

David Beale · 08-17-2007, 11:50 AM

When it shuts down it has to do so in a certain crankshaft position and that adjustment adds to the roughness. That is, it shuts down and uses a MG to position the crankshaft correctly. I've felt/heard mine try two or three times before getting it right. Kind of like "sputtering to a stop".

tekn0wledg · 08-17-2007, 12:47 PM

Yep, totally normal!

08-16-2007, 07:36 PM	#3
Neicy Senior Member Join Date: Apr 2007 Location: Wakefield, MA. Posts: 777 My Car: 2007 Prius Package: G Touring Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 5	Wish I had a nickel for each one of us who asks this. I found it to happen every first shutdown in the morning when I first got mine during the winter (Feb). Seems to have decreased with (1) the warm weather, and (2) the "maturing" of the engine, but still sometimes noticable. Just a little quirk with this car. I want to experiment this winter with putting in the engine block heater - bet it will help since the starts won't be so cold. Once you get used to it and all the other little unique noises you will no longer obsess over it. At first I really thought there was something wrong with the engine. There's nothing wrong - it's just unique and takes some getting used to. Now I don't even notice most of the time. Enjoy your car! __________________ Neicy 2007 Silver Metallic Touring Pkg #2 priuschat.com decal F52/R50 Front Side Window Deflectors Touring Emblem from Avalon Partial Grill Block EBH Repaired 4/06/08 by hobbit 2 Scangauge IIs v 3.15 with X-gauge

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08-16-2007, 06:34 PM	#1
Xabiche Junior Member Join Date: Jun 2007 Posts: 23 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	I have about 1.5k miles on my '07 Touring. Since I got it, it seems that that when the gas engine cycles on/off it is very rough. When I test drove other Prius before buying I didn't notice this, and when I test drove this one I didn't really notice it. But, ever since I bought it I have noticed it. I can understand feeling something when it cycles, but this is really rough. I've been meaning to take in but just haven't yet. Should you normally be able to feel the cycle on/off shake your seat?

08-16-2007, 07:00 PM	#2
Presto Has his homepage set to PC Join Date: Mar 2005 Location: Vancouver, BC Posts: 1,149 My Car: 2005 Prius Package: B Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 3	That's normal. You'll notice it more when the engine is cold.

08-16-2007, 09:43 PM	#4
Tideland Prius Super Moderator Join Date: Oct 2004 Location: Canada Posts: 13,562 My Car: 2005 Prius Package: B Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 11	It'll shut down rough if two conditions are met - the car is new (mine took forever before it shuts down smoothly. Even now after 56,000kms, it shuts down rough now and then) - the engine is cold They've done a much better job with the TCH in terms of reducing vibration when the engine shuts off but with the Prius, it can get violent at times and does not indicate a malfunction. (sound like a owner's manual for a second there lol)

08-17-2007, 11:50 AM	#5
David Beale Senior Member Join Date: Jul 2006 Location: Edmonton Alberta Posts: 1,439 My Car: 2007 Prius Package: B Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	When it shuts down it has to do so in a certain crankshaft position and that adjustment adds to the roughness. That is, it shuts down and uses a MG to position the crankshaft correctly. I've felt/heard mine try two or three times before getting it right. Kind of like "sputtering to a stop".

08-17-2007, 12:47 PM	#6
tekn0wledg Join Date: Aug 2007 Posts: 136 My Car: Package: Nominated 0 Times in 0 Posts TOTM Awards: 0 Friends: 0	Yep, totally normal!