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Old 06-18-2017, 06:12 PM   #1
bascotie
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Join Date: Aug 2013
Default Another idle / turn off issue when slowing down to a stop

Hi guys,

I've read about this online quite a bit, but still haven't narrowed it down.

I have a :

2014 Subaru WRX 5 door

After somewhere in the 10k-15k mile range (possibly after the first time replacing the air filter), I would notice on some drives, when coming to a stop, the idle would dip abnormally low, and often times it would shut off completely. Sometimes it'll dip low enough where the dash lights come on, but then it saves itself.

I've tried:

- Cleaning the MAF
- Replaced the air filter again (during another normally scheduled maintenance)
- Reset ECU recently and turned key to on for 20 seconds, turned to off, then cranked it up fully and let it idle for 25 minutes.
- One thing that seemed to work for 3-6 months was having a family mechanic clean out the throttle body (they sprayed gasoline or something up through the intake for a while). After that, it wasn't 100% idle, but it didn't turn off for months.

Here's some video to see/hear what it sounds like when the RPM dips.

In this first video, you get a dip around around 1:53

Dip at 1:53

Here's another vid after letting it finish idling for about 20 minutes, I then filmed the RPM's from the dash and blipped it a couple times which resulted in a dip (not as bad as usual, but still not proper)

One drip around 0:45s
Again around :59s

Dip around :45 and :59 at least
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Old 06-19-2017, 01:07 AM   #2
mrsaturn7085
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Member#: 375462
Join Date: Dec 2013
Location: Portland, OR
Vehicle:
2006 Impreza WRX STI
WR Blue

Default

Are you on a stock tune? Any mods (such as a BOV)?
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Old 06-19-2017, 01:26 AM   #3
bascotie
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Default

Quote:
Originally Posted by mrsaturn7085 View Post
Are you on a stock tune? Any mods (such as a BOV)?
Thanks for the reply.

The car is totally stock (unless you count the short shifter that came with it)
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Old 06-19-2017, 05:43 AM   #4
Max Capacity
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Join Date: May 2007
Chapter/Region: NESIC
Location: Tolland, CT
Vehicle:
05 LGT,09 SpecB
Black/silver

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Are you sure the air filter box went back together correctly ? On a Legacy GT it's hard to get the bottom of the box into the correct position so the box is sealed and doesn't leak air.
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Old 06-19-2017, 12:39 PM   #5
mrsaturn7085
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Vehicle:
2006 Impreza WRX STI
WR Blue

Default

A leaking airbox should still pass through the MAF and not cause stalling issues.

My guess is you have a very small air leak, post-MAF. Try spraying a small amount of starting fluid near the injectors and compressor inlet and see if the idle speed jumps up a bit.

Factory maps can benefit from a little more idle error timing compensation, but the factory maps are not bad enough to cause stalling.
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Old 06-19-2017, 04:37 PM   #6
bascotie
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Default

Quote:
Originally Posted by mrsaturn7085 View Post
A leaking airbox should still pass through the MAF and not cause stalling issues.

My guess is you have a very small air leak, post-MAF. Try spraying a small amount of starting fluid near the injectors and compressor inlet and see if the idle speed jumps up a bit.

Factory maps can benefit from a little more idle error timing compensation, but the factory maps are not bad enough to cause stalling.
Thanks for the reply everyone.

I'm planning to get another cleaning done on the throttle plate/body hopefully sooner rather than later.

As far the starter fluid test (excuse me, I don't normally do too much mechanical work myself), are you saying to just spray some starter fluid into the turbo inlet while it's idling to see if the idle jumps up?

Would I have to do this at the exact moment that the idle is dropping? It doesn't do it constantly so it'd be a bit tough to time it just right and , even then, not sure if I'd be able to tell if the fluid did it or the car just pushed it back up itself.

In any case, assuming it did, what would be the next step? Thanks for your help and excuse my mechanical ignorance.
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Old 06-19-2017, 07:10 PM   #7
mrsaturn7085
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2006 Impreza WRX STI
WR Blue

Default

You spray the fluid externally (just a little) and if there is a leak, the vacuum will pull the starting fluid (ether) into the inlet and cause the RPM to rise.
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