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Old 08-14-2003, 03:09 AM   #1
JDMSubaru
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Default Starting the engine...

I have noticed an unusual phenomenon. I want to see if any other WRX owners have made note of them same, and if so, might any of you know what causes it?

I have noticed that in the morning when I start my car it will start incredibly fast (or any other time when the car hasn't been driven for at least 3 hours and the temperature reading shows to be at the bottom). But if I go do, say an errand or two, and start the car again after having just recently driven it, it will take considerably longer.

It's weird. Basically when the engine is totally cold it will start lightning fast. If it is hot it will take 3-4 times as long.

Has anyone else noticed this? Does anyone know what causes this?
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Old 08-14-2003, 04:24 AM   #2
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Engine heat soak, and the cold start injection mode being off will cause that. It's a fairly normal phenomenon. Water temp is high, so the computer retards the timing more than when it's cold. Many other factors.
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Old 08-15-2003, 02:21 PM   #3
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Be sure to turn your key to the ON position for 2-3 seconds before going to the START position to allow the fuel system to prime the rails.
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Old 08-15-2003, 03:07 PM   #4
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Quote:
Originally posted by Austin
Be sure to turn your key to the ON position for 2-3 seconds before going to the START position to allow the fuel system to prime the rails.
True. The fuel pump needs to pressurize the system in those first couple of seconds.
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Old 08-15-2003, 03:12 PM   #5
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Wha? The stock system stays pressurized for quite some time. All EFI fuel systems retain high residual fuel pressures, unless your check valve is leaking. This has been known to happen on WRX's.
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Old 08-15-2003, 04:21 PM   #6
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My WRX does the same thing. On cold start it fires right up but takes a couple cranks when its warm.

-- Ed
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Old 08-16-2003, 09:52 PM   #7
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what kind of timing advance is the ecu trying during hot start? during cold start?
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Old 08-16-2003, 11:29 PM   #8
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Quote:
Originally posted by mr2guru
what kind of timing advance is the ecu trying during hot start? during cold start?
Hell if I know. I was just guessing. Ever try starting an old car with a distributor and no timing light? Starts right up when you advance the timing. I used to set the initial advance by ear... hehe
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Old 08-17-2003, 12:20 PM   #9
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Hmmm I was just wondering. trying to setup a link and I am having trouble with starting. (~5 cranks before she fires up) I have messed with cold start enrichment, hot restart enrichment, crank enrichment...etc... but i haven't played with the timing down there. I believe it came preset at about 4-6 degrees over static in those fields. Just wondering if I should advance that or retard that.
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Old 08-23-2003, 11:44 PM   #10
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Hot start is an issue with many sports cars. Some old 911s just flat out won't crank when they are hot. They're also air cooled and "hot" to them is "H-O-T" to us.
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Old 08-26-2003, 05:09 AM   #11
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I'm glad others here recognize this...I saw it as an odd phenomenon at first but then maybe realized that it might be due to the fact I have never owned a turbo car before.
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Old 08-27-2003, 06:22 PM   #12
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Quote:
Originally posted by Austin
Be sure to turn your key to the ON position for 2-3 seconds before going to the START position to allow the fuel system to prime the rails.
I have the same experience. Mine starts slow if it's been sitting for 1-2 hours (stock ECU). If you turn the key to on, you can hear an electric motor whirring for a couple seconds (assuming you have the stereo off). I always try to wait for the whirring to stop before I crank the motor. It's still cranks more than a cold start, but better than just going from "Off" to "Start".
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Old 08-28-2003, 12:42 AM   #13
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Like Fliz said, same thing here, but I'll take it a step further. My car ALWAYS starts faster if I turn it to "on" for 2-3 seconds first, then crank it. Cold, hot, whenever. It might take 0-2 cranks cold going straight to "start", or 0-1 cranks if I let it prime first.

It takes 2-3 cranks hot, and still 0-1 if I let it prime first.

FWIW...
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Old 06-18-2008, 06:15 PM   #14
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I have an '02 WRX and suspect the residual check valve is leaking down. Can someone direct me to where it is? A picture would help. The dealer was no help (no surprise). Is it easy to get at and change? Approx cost? THANKS!!
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Old 02-27-2010, 09:37 PM   #15
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Bump for information on the location of the residual check valve on an '02 WRX. There has to be one as stated further up on this thread.

Thanks!
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