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Old 03-25-2013, 10:05 AM   #1
mario.fernandes
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Member#: 351325
Join Date: Mar 2013
Default Engine start issue - 2009 WRX

Hello you guys.
I am quite a new member at NASIOC and here it goes my first thread.

I am a proudly owner of a 2009 Impreza WRX (265hp) in Brazil.

When the car reached 55,000km (about 35,000 miles) I sent it to the garage to have spark plugs changed and fuel injectores cleaned. After I realized these maintenances shouldnīt have been done so early, but thatīs another matter.

The problem is, after this job was done the engine takes very long to start. If I leave the car parked for a while, letīs say half a day, engine takes several seconds to start and it looks like cilinders got full of gasoline while it was stopped. After some time making engine to start up, it finally runs and the car accelerates normally. If I turn engine off and right after turn it on again, it starts pretty quickly.

This scenario made me think fuel injectors were leaking but they were tested and are perfectly sealed. Also, o-rings were replaced by Subaru OEM ones. Spark plugs installed are also Subaru OEM.

Does anyone know what else should I put some attention on? Really donīt know what this matter should be.

thank you all!

Mario
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Old 03-25-2013, 02:03 PM   #2
corvallisbattery
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Member#: 333030
Join Date: Sep 2012
Chapter/Region: NWIC
Location: Corvallis, OR
Vehicle:
'05 WRX
PSM

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Don't assume that because something is new it was installed properly and didn't have any defects. Sounds like a leaky injector. Check your fuel learn and it should be pretty obvious one way or another
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Old 03-25-2013, 05:00 PM   #3
mechatricity
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Member#: 290592
Join Date: Aug 2011
Chapter/Region: TXIC
Location: Dallas, TX
Vehicle:
2006 WRX Wagon
2004 WRX Wagon

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I would pull one of those plugs and check the gap. There are a lot of "Subaru OEM" spark plugs that have vastly different gaps. It's a very easy mistake to make.
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Old 03-26-2013, 07:09 AM   #4
424wrx
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Member#: 171948
Join Date: Feb 2008
Chapter/Region: Tri-State
Location: new york
Vehicle:
08 wrx vf52,stg3
11 forester,14 legacy dd

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plugs are 6ok item.
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Old 03-26-2013, 07:34 AM   #5
Dragonfueled
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Member#: 224941
Join Date: Sep 2009
Chapter/Region: Tri-State
Location: Central NJ
Vehicle:
09 Wrx
Mica blue

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Try turning the key to run a few times before actually pushing it to start. This will prime the fuel pump and get fuel pressure up. If it then starts normal that means the fuel pump is loosing pressure when it sits. If it still starts bad then most likely a leaky injector.
Also is it cranking fast enough? Battery could be Getting weak and cranking to slowly
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Old 03-26-2013, 09:13 AM   #6
bboylocob
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Member#: 151809
Join Date: Jun 2007
Chapter/Region: South East
Location: New Orleans
Vehicle:
2007 WRX
Black

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OK my car does the same but I k ow my issue. Maybe same for u too but I doubt.

My car has an after market fuel pump. Most fuel pumps have a one way valve in it to keep the fuel pressure up so it starts normal. Mine don't so the fuel pressure drops if not started let's say over night.

If u turn the key and let it prime And build pressure it should start pretty close to normal. Did they change Ur fuel pump? Or it could be a leaking fuel injector.
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Old 04-15-2013, 10:36 AM   #7
mario.fernandes
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Join Date: Mar 2013
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Hello folks.

Here it goes a follow up on this issue: I had the fuel injectores replaced by new ones and the engine start is now perfect!

Iīm pretty sure the cleaning procedure damaged one or some of them.

Thank you all.

Mario
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