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Old 09-19-2016, 05:13 PM   #1
inpuressa
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Member#: 107497
Join Date: Feb 2006
Vehicle:
2008 WRX STi

Default Starting issues

Update:

I have an issue with my 08 STI where the dealer, and 2 shops could not figure out.
It is a startup issue where the car would take about 5 sec of cranking to start up.

Here are some things to note:
1. Car needs to be parked for at least 15-20min for the hard start to come in.
2. Car will start up fast like normal if it is within say a few min. (eg. start up from a stall or filling up tank)
3. Once I can get the engine running, it doesn't matter if its hot or cold, it will start up fast as long as its within a few min.
4. In the morning, while the engine is warming up, the idle feels a bit rough.
5. On long stops like overnight or from work, upon start up, I see white smoke come out from the exhaust that lasts for a second and goes away completely after. (smells like gas)
6. Once the engine is warmed up, the car runs perfectly fine, no stumbles, no smoke, has power, etc.
7. Engine oil level ok, no milky look, no smoke from oil cap. Radiator levels ok.

In a nut shell, time seems to be the biggest factor involved in creating this.

Car has 75000 miles, Cobb AP stage 2 w/catted DP.
Perrin turbo inlet, everything else stock.
No CEL at all.

Want to get to the bottom of this.
Any suggestions would be appreciated.
Thanks
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Last edited by inpuressa; 11-11-2016 at 07:59 PM.
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Old 09-19-2016, 06:08 PM   #2
Davidbag001
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Member#: 366632
Join Date: Aug 2013
Chapter/Region: TXIC
Location: fort worth texas
Vehicle:
2013 wrx hatch
dmg

Default

Sounds like the fuel system is losing its prime possible causes are fuel injector stuck (car would run rough), fuel pump, or pressure regulator.
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Old 09-20-2016, 03:39 PM   #3
MikeG4936
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Member#: 260561
Join Date: Oct 2010
Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
2006 Impreza WRX Ltd
Grey

Default

Fuel pump would be my guess. Is it stock or aftermarket? What brand? Were the o-rings installed properly?
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Old 09-20-2016, 07:07 PM   #4
inpuressa
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Member#: 107497
Join Date: Feb 2006
Vehicle:
2008 WRX STi

Default

The car has Cobb stage 2 and perrin inlet(stock one ripped).
Other than that, the fuel system is stock.
One thing I noticed is that my battery voltage dips down to 10.2-10.5 when cranking. It is around 12V on the times that cranks right back up. Can a failing batt cause these symptoms?
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Old 09-21-2016, 02:12 AM   #5
MikesSTi
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Join Date: Feb 2015
Chapter/Region: South East
Location: Atlanta
Vehicle:
2006 Sti
Blue

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I had the same issue for some time. I had the battery and alternator tested multiple times and they always passed. Last weekend I pulled out the crappy battery relocation and got a new battery. Car starts every time now. So Id go through all your ground and hot wires to make sure they are ok and try a new battery.
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Old 11-11-2016, 08:00 PM   #6
inpuressa
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Member#: 107497
Join Date: Feb 2006
Vehicle:
2008 WRX STi

Default

Updated the issue with a little more detail.
Checked the suggestions in the thread, but those didn't fix it.

Had a subaru shop check it, they told me it was the spark plugs, paid $400 for the job to get plugs changed That didn't fix it at all. Obiviously something else is wrong.
Anyone else can chime in?
Thanks
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Old 09-18-2017, 02:03 PM   #7
mark.mata
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Default

Did you ever figure this out? I am having the exact and I mean the exact issue with my 2012. I have a few more mods but pretty close to yours.
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Old 09-18-2017, 03:15 PM   #8
Harveyfc3
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Member#: 464430
Join Date: Mar 2017
Location: Joplin, MO
Vehicle:
2007 Impreza WRX
Black

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I second that the system is losing prime. What happens if you key on the car, count to 10, and then try to start?
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