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This is a discussion on Gas engine stumbles before cutting off within the Gen II Prius Care, Maintenance and Troubleshooting forums, part of the Gen II (2004-2009) Toyota Prius Forums category; I have 8500 miles on my 08 Prius. Recently, when I come to a stop, the gas engine sounds like ...


Gas engine stumbles before cutting off

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Old 06-02-2008, 01:56 AM   #1
theegg
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Default Gas engine stumbles before cutting off

I have 8500 miles on my 08 Prius. Recently, when I come to a stop, the gas engine sounds like it is "stumbling", the car shakes noticeably & then the gas engine cuts off. It tends to do it a lot when I start the car, drive a few yards, and stop before pulling onto the street. The car will have sat for 4 or 5 hours, and the ambient temperature in GA has been in the 90s. Is this engine behavior common? It doesn't do it all the time. And I haven't noticed any decrease in performance. Suggestions please.
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Old 06-02-2008, 01:58 AM   #2
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Default Re: Gas engine stumbles before cutting off

Totally normal operating procedure for a Prius.
Suggestion: Relax and smile each time it does it . . . you are saving gas!

Last edited by Sufferin' Prius Envy; 06-02-2008 at 02:02 AM.
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Old 06-02-2008, 04:22 AM   #3
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Default Re: Gas engine stumbles before cutting off

Perfectly normal. If you do a search for "stages of operation" you'll get lots of info. The one I'm attaching has some great links at the bottom.
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File Type: pdf PriusStageModeReference030208.pdf (15.7 KB, 41 views)
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Old 06-02-2008, 04:25 AM   #4
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Default Re: Gas engine stumbles before cutting off

I switch to the Mobil 1 0-w20 oil about 1500 miles ago and my car hasn't stumbled like that since. In fact my passengers can't even tell when the engine cuts out.
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Old 06-02-2008, 06:00 AM   #5
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Default Re: Gas engine stumbles before cutting off

Quote:
Originally Posted by Rakimb17 View Post
I switch to the Mobil 1 0-w20 oil about 1500 miles ago and my car hasn't stumbled like that since. In fact my passengers can't even tell when the engine cuts out.
I too switched to Mobile 1 synthetic . . . 45,000+ miles ago, and I still feel the hard stumble every once in a while.

Oil has little to do with it.
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