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Old 03-07-2013, 01:16 PM   #1
Barnt
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Default Occasionally doesn't start unless accelerator held down

I'm sure this has been discussed somewhere but I haven't been able to find it yet. Can you point me in the direction of a helpful link?

Just recently my 05 wrx had a long crank to start, and then finally sputtered and caught after 3 or 4 tries. Drove 40 miles back home and it ran perfectly the entire way. Next morning it wouldn't start so I gave up after several tries cranking it and drove my truck to work. The next couple days it only started with the gas pedal held half way down and it took a few seconds but sputtered and started up and then ran perfectly. Thought at first I might have had some bad fuel but I filled it up (different station) and its still doing it.

My best guesses are:
-fuel pump going? (unlikely...?)
-clogged fuel filter (90k miles on it)
-bad fuel pressure regulator
-leaking fuel injectors (had happen on an 1990 Ford Bronco II)
-sticking idle air control valve? (this suggested by a friend)

130k miles, Cobb stg 1, I put in a new battery, sparkplugs, and airfilter less than 2000 miles ago

I have a new fuel pump and filter waiting for me at a dealership since I get OEM parts at dealer cost through a friend anyways
Any productive comments are much appreciated.
Thanks!
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Old 03-07-2013, 08:23 PM   #2
Uncle Scotty
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clogged fuel filter??

change that first....

bad tank of fuel??

happen after a fill up??
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Old 03-08-2013, 04:34 PM   #3
Barnt
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No, it was happening on about a quarter tank. I thought at first it may have been bad fuel so I filled up and it did not solve the issue. I'm changing the filter tomorrow. Hope that's it.
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Old 03-09-2013, 12:41 AM   #4
mod maniac
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I fixed one that did that because of leaky injectors. I don't know if that is your problem but it fixed this customers car.
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Old 03-12-2013, 01:25 AM   #5
Barnt
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Changed filter and pump. Problem persists...
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Old 03-12-2013, 03:20 PM   #6
jayman4312
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you changed the filter under the hood? or just the "sock" or "filter" that's on the pump.
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Old 03-12-2013, 03:41 PM   #7
ogboot
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Can you hear the fuel pump prime when you insert the key and turn it on on (but do not start)?
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Old 03-12-2013, 03:49 PM   #8
Brock31
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I've had this happen before. Very intermittently (sp) maybe once every 2-3 months.

No other symptoms. Even after FP is primed, which I do at every start up.
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Old 03-13-2013, 04:26 PM   #9
Barnt
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fuel pump is brand new. primes just fine.

and i was unaware of any underhood-filter for the wrx after 2004
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Old 03-13-2013, 08:31 PM   #10
fastnoypi
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check the elbow behind the maf to the inlet, or the inlet to the turbo.
If any of the track is disconnected or have a large enough rip, you can have starting problems that you described.
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Old 03-13-2013, 08:38 PM   #11
Psychoreo
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Having the accelerator pedal pushed to the floor used to engage "clear flood mode," I'm not sure when that stopped. It's possible you have a failing or stuck open injector that's pouring fuel and preventing it from running properly. If you have access to a stethoscope or long screw driver, place it on each injector while someone cranks it and see if you can hear them clicking.
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Old 03-14-2013, 12:55 PM   #12
Barnt
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^^thanks I'll check on both of these this weekend. much appreciated.
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Old 03-14-2013, 09:01 PM   #13
Haelan
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Quote:
Originally Posted by Barnt View Post
^^thanks I'll check on both of these this weekend. much appreciated.
Pull the plugs and visually inspect if a cylinder is running rich (possible stuck injector). If holding the accelerator down helps to start then not enough air is getting passed the throttle plate, which could be the IACV--it acts as a throttle plate bypass.
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