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Old 07-10-2003, 01:47 PM   #1
Pre-diddy
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Default STi headlights. Auto off?

I know this is a weird question, but do the headlights turn off automaticly when the car is turned off?

Today is like the 10th time in the last couple weeks I have left my car lights on and killed my battery.

I hope the STi has auto offs...
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Last edited by Pre-diddy; 07-10-2003 at 02:09 PM.
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Old 07-10-2003, 01:48 PM   #2
JDMTEG98
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good questions I will try it an let you know.
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Old 07-10-2003, 01:49 PM   #3
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I would assume it does. I have owned an 04 wrx, 02 wrx, 96 outback, 90 legacy, and they all turned the lights off for you when you turn the key off. In my 04 wrx I always have them on. Turn key on, lights come on, turn key off, light go off. The only time the switch goes off is when the car goes in for service. they turn my lights off everytime...
Ben
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Old 07-10-2003, 02:51 PM   #4
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yes
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Old 07-10-2003, 03:13 PM   #5
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sweet.

I'm starving right now, cause I left my lights on and couldn't drive to pickup lunch. Now I am going to need a jump start to leave work. Stupid lights. I can't wait for my STi.
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Old 07-10-2003, 03:58 PM   #6
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Hey at least you STi will be manual so you can push start it when you do dumb stuff like kill the battery. Is the mercury stick? Push starting heavy cars is always fun...
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Old 07-10-2003, 11:46 PM   #7
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Default be careful

The head lights turn off but if you accidentally hit the parking light switch on the steering column the brakelights will come on even if the key is out. This could ruin your day.



I have never had to push start a fuel injected car and always wondered if it would work. Doesn't the ECU have to have power to meter fuel to the engine? Carbs work because the vacuum from the engine pulls the gass out of the float bowl but I thought injected cars used pumps controlled by the ECU?

Can anyone elaborate?
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Old 07-10-2003, 11:52 PM   #8
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I push started my CRX many times and it was FI (and a LOT lighter than an STi).

Lights on warning buzzers are very cheap and easy to install. I saw them at Wal-mart for <$5. Very useful for cars that do not have this feature.
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Old 07-11-2003, 09:19 AM   #9
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Unfortunatly, the Merc is auto, so I had to get a jump from a co-worker. I've push started a Miata before, so I know its possible on fuel injected cars.

I think I just need to start carrying a backup battery in my trunk.

50/50 weight distribution, here I come
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Old 07-11-2003, 12:12 PM   #10
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Push start will not work with the clutch relay. As soon as you release the clutch to start it, the starter is killed because the clutch is out. ...kind of a Catch-22.

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Old 07-11-2003, 12:37 PM   #11
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But when you push start the motion of the car becomes the starter motor. My honda has the same clutch relay but I have pushed started it a bunch. The only time this has not worked was when the battery was drained passed the point of being able to supply any spark at all.

J
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Old 07-11-2003, 12:39 PM   #12
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They're auto-off in the sense that the headlights are switched off with the ignition. When you start up again, though, the headlights will be on.
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Old 07-11-2003, 12:43 PM   #13
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Quote:
But when you push start the motion of the car becomes the starter motor. My honda has the same clutch relay but I have pushed started it a bunch. The only time this has not worked was when the battery was drained passed the point of being able to supply any spark at all.
Hmmm, interesting.... I have never been able to do it with my RS (2 tries) or my old Jetta. It could be that the relay opens up more than the starter, or it just didn't work (although it was down a steep incline). Anyone been able to do it with their Subaru?

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Old 07-11-2003, 12:43 PM   #14
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there was a time my '73 VW bus (yes I WAS a hippie) had a dead battery and I used to always park on a hill or slope.

'73 was real big with lots of steel.

I was dumb enough to be using an upright from a '70 (different story) instead of the pancake it came with.

but that thing started like a champ!
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Old 07-11-2003, 12:47 PM   #15
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I actually think it has something to do with the HID lights. On my mom's porsche, even when you leave the lights in the on position, they don't remain on when the car is turned off. Doesn't the arc inside the bulb need a lot of energy to spark or light, or whatever the term is for igniting the xenon gas, and then only requires a little bit of energy to stay on?
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Old 07-11-2003, 12:48 PM   #16
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forgot to mention...

VW also turned off the lights for you.

what a sweet function!
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Old 07-11-2003, 12:49 PM   #17
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In fact if the starter motor is disengaged then it would be more beneficial since you have less drag on the motor. I have never owned a subaru before let alone tried to jump start one so I am only talking from experience with other cars. It would be nice to know if there is a fundamental reason why you wouldn't be able to jump start a subie.

J
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Old 07-11-2003, 01:25 PM   #18
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ooo! ooo!

i know.

the fuel pump is electical.

that means if you don't get it with the fuel left over in the system you won't be able to get.

old VW engines had mechanical fuel pump, so even if there was nothing left in the carb you could get fuel moving.
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Old 07-11-2003, 02:24 PM   #19
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Hmmm. I bet that is why the vw's would push start so easily, but the honda's are electrical too...

I think the scenario for push starting has to be just right. You can't have a completely dead battery otherwise you would never get a spark for ignition. However the amount of current required to get the starter to turn is huge so it would be easy to drain the battery past this point. When the battery has enough juice to run the fuel pump and spark plugs but not enough to run the starter, push starting should work.

J
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Old 07-12-2003, 12:23 AM   #20
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When your battery is drained because you left your light on, it is not completely dead. It might be 9volts instead of 12.8volts. This is not enough to drive your starter, but it may be enough to run your fuel and ignition systems. Push starting may be possible theoretically. However there are always exceptions, like the clutch relay that Chin mentioned.
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Old 07-12-2003, 12:57 AM   #21
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Default Auto Off

Quote:
Originally posted by Ulf Wafflestein
I actually think it has something to do with the HID lights. On my mom's porsche, even when you leave the lights in the on position, they don't remain on when the car is turned off. Doesn't the arc inside the bulb need a lot of energy to spark or light, or whatever the term is for igniting the xenon gas, and then only requires a little bit of energy to stay on?
Even the Canadian cars without HID's shut the headlights off, even though the engineering was probably done for that reason.

The HID bulbs are ~35W (versus ~65W for Halogen) so they do use less energy. I think the HID's use a capacitor charge though to ignite them. Thus, there might be drain on that circuit as well? I don't know.

Acura lets you leave your HID's on for 15 minutes before shutting them off for you.

Oh, and our 1990 and 1994 GM's had auto-lights that not only shut themselves off, but also turned themselves on when it got dark!! A piece of technology that still seems to baffle the Japanese manufacturers....
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