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Exhaust visible with car at stop light - Page 3

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Posted by Elmo P. Shagnasty on March 23, 2008, 3:08 am

Actually, it WILL happen as a result of ANY driving.

Posted by Tomes on March 23, 2008, 1:00 pm
"Shawn Hirn" ...

Could be, but at this time of year (and not knowing where the OP is) I would
bet on it needing heat for the cabin.
Just a guess.

Posted by Bob & Holly Wilson on March 25, 2008, 9:27 am

Several things can cause this:

1) initial warm-up - the engine runs until the catalytic converter and
engine coolant are warm enough. The earlier, 2001-03 Prius can take over
5 minutes to get the coolant warm enough. Although the 2004-current
Prius has a thermos, if it was sitting unused over a long weekend, the
hot coolant could have chilled and warm-up would take longer.

2) other loads - depending upon the cabin controls, the engine may run
to sustain coolant warmth or handle battery management. Defrost is
notorious for causing the engine to run longer.

3) warm-up phases - there are some distinct warm-up phases that might
not have been passed through.

Bob Wilson

Posted by David Kelly on March 25, 2008, 12:16 pm
 kaplan3jiim@example.com wrote:

A Prius engine runs when a Prius engine needs to run.

If you *saw* exhaust vapors then the engine and exhaust pipe were still
cold and burning off moisture in the exhaust pipe.

Heater doesn't have to be on high for the engine to run, but the higher
its set the more the engine will run when stopped. The defroster runs
the A/C, and when sitting the engine will run about 1 minute out of 10
when the A/C depletes the battery.

Posted by Tomes on March 26, 2008, 12:47 am
 "David Kelly" ...

...and if the defroster is running calling for heat the engine has an
additional demand to run at the same time.

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