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post #1 of 9 (permalink) Old 01-27-2007, 07:36 PM Thread Starter
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Default Prius engine rev?

I love my 2005 Prius, but I had my first problem driving today - can anyone make sense of this?

After accelerating or even maintaining speed, when I took my foot off the gas, the car engine continued to rev. The motor didn't turn off - almost as if it was stuck in a gear. This happened only a couple of times, but enough to make me nervous. Also, when stopped at a light, the engine didn't cut out (no a/c, heat, radio on but lights were on).

It was in the 30's today ; nothing too bad cold-wise and we were in the car for a good 20 minutes before the revving started.

Any thoughts? Thanks!
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post #2 of 9 (permalink) Old 01-27-2007, 08:26 PM
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Default Re: Prius engine rev?

Doesn't sound like a problem to me. Just because you take your foot off the gas doesn't mean the ICE (internal combustion engine) shuts down. If you're traveling above 42 mph, it can't.

When at a stoplight, it can still continue to run because you have the heat on or if the HV battery needs charging or if the catalyst isn't up to operating temp yet. Try hitting the Off button on the HVAC system when stopped. I've had the ICE shutdown right when I hit that.

Having the AC or defrost on means that the AC compressor might be running, placing a further electrical load on the car.

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post #3 of 9 (permalink) Old 01-27-2007, 10:34 PM Thread Starter
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Thanks - no, I understand about the above 42 mph threshold, but it's never happened like this before. We were on the highway and when I took my foot off the gas, the engine revved like it needed to be switched up a gear. The engine wasn't just running, it was revving.

When we were at the light, we didn't have any HVAC on (no heat, no a/c) - do you think the engine was warming itself? It was in the 30's but we had been in the car for an hour.

Are these 2 things related or separate?

Thanks again-
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post #4 of 9 (permalink) Old 01-28-2007, 12:05 AM
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Default Engine reving

Just curious -- were you driving in the mountains or on level ground?

I experienced something similar after an extended downgrade while using regenerative braking to hold down speed.
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post #5 of 9 (permalink) Old 01-28-2007, 01:32 PM Thread Starter
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Pretty flat, actually. We were on the Long Island Expressway - doing about 65 or so. But it did feel like the car was braking a bit more than normal when I had my foot off the gas.
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post #6 of 9 (permalink) Old 01-28-2007, 01:51 PM
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Quote:
Originally Posted by nylyddane
Pretty flat, actually. We were on the Long Island Expressway - doing about 65 or so. But it did feel like the car was braking a bit more than normal when I had my foot off the gas.
Were you running in "B"? That will cause the ICE to run and rev more.
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post #7 of 9 (permalink) Old 01-28-2007, 02:59 PM
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Default Re: Prius engine rev?

Quote:
Originally Posted by cwerdna
Doesn't sound like a problem to me. Just because you take your foot off the gas doesn't mean the ICE (internal combustion engine) shuts down. If you're traveling above 42 mph, it can't.
This is true if you're on level or uphill terrain. But I have gone 70 MPH on a downhill interstate run--even under light acceleration--and the ICE normally doesn't run according to the MFD Energy display.
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post #8 of 9 (permalink) Old 01-28-2007, 03:22 PM
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The ICE runs, but if it isn't adding thrust, it won't show as running on the screen. It's not an activity screen, it's an ENERGY screen--under those conditions the ICE isn't contributing energy, so it doesn't show.

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post #9 of 9 (permalink) Old 01-28-2007, 10:22 PM
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Default Re: Prius engine rev?

Quote:
Originally Posted by nylyddane
Any thoughts? Thanks!
My bet is you were in S3a.
http://priuschat.com/lofiversion/index.php/t13519.html

Ken@Japan
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