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Old 01-11-2020, 04:15 PM   #1
ZACK777
Scooby Newbie
 
Member#: 159744
Join Date: Sep 2007
Location: Cincinnati, OH
Vehicle:
2004 STi
Blue

Default 04 sti sumbled then quit and wont restart

Hey guys I have an 04 sti, bought it a few months ago with 182k miles. Has some simple bolts-ons tbe, tmic, bov, intake, gauges but unsure on what the tune is if it has one at all. The car ran great but would usually stumble and hesitate in the mornings until it warmed up then ran perfectly fine after that. One morning though it stumbled pretty bad and just quit and wouldn't restart. No cel. Fuel pump is priming and and seems to be pumping a good amount of fuel at the rails. Haven't checked for spark or compression or anything else really. Just pushed it into my garage and got on here. My initial thought was maybe a cam or crank sensor went bad? Any help would be greatly appreciated.
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Old 01-11-2020, 05:54 PM   #2
dryvby
Scooby Newbie
 
Member#: 49931
Join Date: Dec 2003
Chapter/Region: MWSOC
Location: Grand Rapids, MI
Vehicle:
0305 wrx/Xt
black/black

Default

Donít replace any sensors. Like you stated, check pressure at the rail(s). Inspect the plugs and coils and report back.
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Old 01-11-2020, 07:58 PM   #3
Blackfin
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Member#: 361325
Join Date: Jul 2013
Chapter/Region: E. Canada
Location: Ontario
Vehicle:
2010 STi
Dark Gray Metallic

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Do you have service records from the PO? If so, when was the timing belt last done?
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Old 01-12-2020, 11:28 PM   #4
AliBenn
NASIOC Supporter
 
Member#: 487
Join Date: Nov 1999
Chapter/Region: TXIC
Location: Greatwood/Sgrlnd
Vehicle:
1998 /2005 STunIcorn
Acadia Green RS-T

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Man would throw code if sensor

I agree with above post
Check FPress Check plugs
Report
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Old 01-13-2020, 11:33 AM   #5
BlackFighter
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Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:
2004 WRX STI Black
RalliSpec Shortblock

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Check the TB idle air controller. There is a small rubber gasket that over time cracks and causes to leak. Check it out first. In the link to the pic you can see where the controller and gasket are located. The link is for a WRX but i believe the 04 sti had the same or close to same TB. The WRX is a DBW but i believe the IAC is the same. If you decide to open and inspect the gasket, i would recommend replacing it with a new one even if the old one looks fine, because as soon as you release a 16 year old gasket, it will never seal the same.

http://my.prostreetonline.com/wp-con...4/throttle.jpg

https://my.prostreetonline.com/2014/...throttle-body/


Here is a link to a new gasket if you want to change it,

https://www.fastwrx.com/products/idl...l-valve-gasket

Last edited by BlackFighter; 01-13-2020 at 11:39 AM.
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