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Old 01-03-2021, 03:13 PM   #1
Nway0455
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Member#: 408391
Join Date: Dec 2014
Location: Colorado
Vehicle:
2015 WRX STI Limited
Silver

Default Cold Start/Stall on Hill issue

So this morning my buddies truck was dead so I was reversing up my driveway which is a hill (packed with ice) and I stalled. My car then decided it didnít want to restart, it would crank but wouldnít turn over. I ended up resetting my ECU and then let it ride into neutral into the road so it was level and it turned over instantly. I just found it to be really odd? What would cause that? My oil burn is well within spec, no smoke runs great drives great. My only complaint ever is it hates life while itís warming up in sub 30 temperatures until around 120 coolant temp.

Full bolt on 2015 WRX STI Limited
with a custom Tune In Colorado Elevation of about 4500.
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Old 01-03-2021, 03:35 PM   #2
Gucciflipflops
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Member#: 521349
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Chapter/Region: South East
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2005 STI
Aspen White

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Random thought: what viscosity oil are you using?
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Old 01-03-2021, 03:47 PM   #3
Nway0455
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Member#: 408391
Join Date: Dec 2014
Location: Colorado
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2015 WRX STI Limited
Silver

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Quote:
Originally Posted by Gucciflipflops View Post
Random thought: what viscosity oil are you using?
5w40 Motul X Clean, it always starts right up in the mornings even when cold but it revs high and if I try to drive before it reaches about 120 coolant and I get to a stop sign the idle will hunt a little bit going from rich to lean afrs. Iíve looked into it but that seems to be fairly common with aftermarket fuel set ups. Only does that when itís cold thatís what I meant when I said it hates life until itís warmed a bit, however this new one is not something Iíve encountered before.
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Old 01-03-2021, 05:46 PM   #4
Gucciflipflops
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Chapter/Region: South East
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2005 STI
Aspen White

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Quote:
Originally Posted by Nway0455 View Post
5w40 Motul X Clean, it always starts right up in the mornings even when cold but it revs high and if I try to drive before it reaches about 120 coolant and I get to a stop sign the idle will hunt a little bit going from rich to lean afrs. Iíve looked into it but that seems to be fairly common with aftermarket fuel set ups. Only does that when itís cold thatís what I meant when I said it hates life until itís warmed a bit, however this new one is not something Iíve encountered before.
Interesting. Kind of sounds like your fuel pump simply wasnít reaching the fuel at that angle.
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Old 01-03-2021, 06:29 PM   #5
Nway0455
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Member#: 408391
Join Date: Dec 2014
Location: Colorado
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2015 WRX STI Limited
Silver

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Quote:
Originally Posted by Gucciflipflops View Post
Interesting. Kind of sounds like your fuel pump simply wasnít reaching the fuel at that angle.
Well I hope thatís all it is, itís a pretty steep hill as well.
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Old 01-03-2021, 08:10 PM   #6
Vancouver98STi
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Member#: 459287
Join Date: Dec 2016
Chapter/Region: VIC
Location: Vancouver BC Canada
Vehicle:
1998 JDM Impreza STi
V4 GF8 White

Question

Quote:
Originally Posted by Nway0455 View Post

...it would crank but wouldnít turn over.
If it cranks, it is turning over. It just isn't starting.

Quote:
Originally Posted by Nway0455 View Post

I was reversing up my driveway which is a hill (packed with ice) and I stalled. My car then decided it didnít want to restart... then let it ride into neutral into the road so it was level and it turned over instantly.
Obvious question... How much fuel in the tank?
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Old 01-03-2021, 08:28 PM   #7
Nway0455
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2015 WRX STI Limited
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Quote:
Originally Posted by Vancouver98STi View Post
If it cranks, it is turning over. It just isn't starting.


Obvious question... How much fuel in the tank?
Half a tank.
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Old 01-26-2021, 04:19 PM   #8
Zmaegriffin
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Join Date: Jan 2021
Default 2015 Impreza Start Issues

First mine would start but stall out before I could get it into gear. I put some oil in and then It started fine after that. Now the break will not decompress so I can push the ignition button. All the lights, radio and stuff comes on but car will not start. I have turned it off and let it sit then try again and it starts. I noticed the ABS, Hill climb, and traction lights are on at the same time. Unfortunately, the next time I try to start it it wonít start. Not sure if I am in advertently hitting something thatís locking the brakes? Any ideas?
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Old 01-27-2021, 12:55 PM   #9
Jedi03
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Join Date: Sep 2018
Chapter/Region: SWIC
Location: New Mexico
Vehicle:
2009 STi Blue
Blue

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i had that happen once on my sti, stalled coming from a stop and wouldn't restart for ~15 minutes, figured it flooded as reset ecu didn't resolve and everything was working with no CEL...no issues before or after
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