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Old 10-17-2013, 05:04 PM   #4 (permalink)
jedi_sol
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Join Date: Mar 2009
Location: Tustin, CA
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2013 STi *SOLD* - '13 Subaru Impreza WRX STi
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1996 Geo Metro *RETIRED from Ecomodding* - '96 Geo Metro Base
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Quote:
Originally Posted by RedDevil View Post
Second that.
My Insight will shut the engine off when stopped (Auto-Stop) but restarts within 20 seconds or so, where it should last much longer.
I used to key off at the lights to prolong the autostop.

My new UG now shows the real reason why the engine restarts: the voltage drops below 11.6 volt, and continues to drop if I keep the engine off for too long (with lights and radio on)...
I 3rd that. A general rule of thumb with battery voltages (car is completely off with no load on the battery at all):

Full charge 100% is 12.7volts
90% is 12.6volts
80% is 12.5volts
70% is 12.4volts
60% is 12.3volts
50% is 12.2volts
40% is 12.1volts
30% is 12.0volts
20% is 11.9volts
10% is 11.8volts
0% is 11.7volts

Check your battery voltages with a volt meter with the engine off to see where the battery voltage is at.

This is also why if you us heavy p&g...you should also switch your battery out with a deep cycle battery
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