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Old 11-11-2012, 01:27 PM   #26
easterbran
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Quote:
Originally Posted by simpsonsdotcom
I changed the plugs, and they actually looked really good, didn't need to be changed, but I figured I had new ones so I put them in. No oil or anything on the threads or tip so I doubt that is it. I was thinking coil packs too, but they are so expensive just to get one and they weren't in stock anyplace I decided to explore other roots first.

161,xxx miles. Fuel pump/filter could be the issue. Where is the filter on these?
If it was the pump wouldn't it just not work? Do they slowly go bad?

Thanks for the replies
Sounds like my exact thought progress (and my tuner's) when resolving my issue. My fuel pump went bad over the course of about a thousand miles. First, it began sputtering and hesitating only at WOT every once in a while. A hundred miles later, sputtered every time at WOT. stayed like that for 500 miles, then one day it was horrible. If I was in boost AT ALL, it would sputter. The last hundred miles before I changed the pump, the car was not driveable. It could barely get to 3k rpms, had like a 20 second 0-60, and felt like I was constantly engine braking. This had occurred after replacing the spark plugs, compression test, coil pack testing, and smoke testing (and fixing small Vac leak). The car wouldn't even start the day I was replacing the fuel pump. After the install, she ran beautifully again (after I replaced my front O2 sensor because of a poor idle and constant stalling)
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Old 11-11-2012, 01:29 PM   #27
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Check fuel pressure. If pressure is good then I would highly recommend coil packs.
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Old 11-11-2012, 04:07 PM   #28
simpsonsdotcom
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So I changed the Front O2. Reset ECU, went for a drive - No difference.
Just changed the fuel filter. Spilled some gas in the engine bay so waiting for it to evaporate before I try it again.

How do I check the fuel pressure?

If this doesn't work I will probably be ordering a fuel pump.
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Old 11-11-2012, 04:34 PM   #29
easterbran
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Quote:
Originally Posted by simpsonsdotcom
So I changed the Front O2. Reset ECU, went for a drive - No difference.
Just changed the fuel filter. Spilled some gas in the engine bay so waiting for it to evaporate before I try it again.

How do I check the fuel pressure?

If this doesn't work I will probably be ordering a fuel pump.
If you do order the pump, ERZ Performance has a 10% off coupon code with free shipping in their vendor thread on here. They got it to me fast and safely
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Old 11-11-2012, 06:25 PM   #30
simpsonsdotcom
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Ok so fuel filter didn't make a difference.
I texted the person I bought it from (goldshuscooby) to see if he changed the fuel pump, and it already has a Walbro 255 in it! was put in about 60,000 miles ago. So most likely not it either.

So ignition coils? haha
Any other suggestions?
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Old 11-11-2012, 06:27 PM   #31
easterbran
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Quote:
Originally Posted by simpsonsdotcom
Ok so fuel filter didn't make a difference.
I texted the person I bought it from (goldshuscooby) to see if he changed the fuel pump, and it already has a Walbro 255 in it! was put in about 60,000 miles ago. So most likely not it either.

So ignition coils? haha
Any other suggestions?
Aww man! I thought I had it! I wouldn't completely rule out the pump though. You should test the fuel pressure just to make sure. Those coils are not cheap.
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Old 11-11-2012, 09:04 PM   #32
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I bought a coil pack from Advance Auto online and used coupon codes and got it for like $80. I also changed fuel filter before doing so.
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Old 11-11-2012, 09:06 PM   #33
easterbran
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Quote:
Originally Posted by oOIIJoshIIOo
I bought a coil pack from Advance Auto online and used coupon codes and got it for like $80. I also changed fuel filter before doing so.
Wow that's a pretty great deal. I thought they were MUCH more expensive.
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Old 11-11-2012, 09:08 PM   #34
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www.retailmenot.com is where I got my codes. Saved me a bunch. Originally $101 before shipping or in-store.
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Old 11-11-2012, 09:23 PM   #35
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Thanks, I might have to so the same.
Were you experiencing similar symptoms before?
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Old 11-12-2012, 12:12 AM   #36
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My car did the exact same thing and it was a TGV sensor that was incorrectly installed (didn't tension it correctly all the way).
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Old 11-12-2012, 03:03 PM   #37
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Could the TGV sensor be bad? It hasn't been changed so it wouldn't be incorrectly installed. Would that throw a CEL?
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Old 11-12-2012, 04:34 PM   #38
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Alright so right now my questions are:
Is there a way to check the ignition coils without having a known good coil? (keeping in mind my only problems are under wot)
Could it be the PCV valve?
Do WRXs have EGR valve? Could it be this?
Could it be TGV sensor?
Keep in mind no CELs

Thanks in advance
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Old 11-13-2012, 10:30 AM   #39
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I experience exact same thin with coil pack issue. If you creep into the throttle it wouldn't do it as bad. But at around 4-5k RPMS an WOT it would hardly run. And there is no way to check the resistance on the coil packs that I know of. The ignitor is integrated into the coil.
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Old 11-13-2012, 10:30 AM   #40
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I also had no CELs.
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Old 11-13-2012, 11:59 AM   #41
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So last night I ordered an ignition coil from RockAuto. I used a coupon from www.retailmenot.com thanks oOIIJoshIIOo! Got it for $57 shipped!

I also ordered a fuel pressure gauge. What psi should i be expecting?

Last edited by simpsonsdotcom; 11-16-2012 at 06:23 PM.
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Old 11-13-2012, 01:36 PM   #42
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I think around 41-47 psi. At least for 02...I believe it is the same for all up to 05 WRXs. I may be wrong.
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Old 11-13-2012, 02:22 PM   #43
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Quote:
Originally Posted by simpsonsdotcom View Post
So last night I ordered an ignition coil from Rockford auto. I used a coupon from www.retailmenot.com thanks oOIIJoshIIOo! Got it for $57 shipped!

I also ordered a fuel pressure gauge. What psi should i be expecting?
If you take the vac line from the Fuel pressure regulator off of the intake manifold, it should be a constant pressure ~43-ish psi.

With that vac line attached to the FPR it will "add" the intake manifold pressure (in gauge psi, not absolute psi) to that 43-ish psi. That should give you ~43 + (pressure in psig... which will be a negative number at idle.)

Typical EJ20 vac @ 750 RPM idle is around 17-18 in Hg, which is around -8 to -9 psig, so idle fuel pressure should be just under 35ish psi.

Obviously it's easiest to check and verify by popping that vac line off the intake manifold, since it should be a constant value just under 45 psi.
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Old 11-13-2012, 10:23 PM   #44
simpsonsdotcom
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Thanks Concillian and oOIIJoshIIOo that makes sense. Can't wait to get the next round of parts to check it out, hate having a broken car!!
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Old 11-16-2012, 12:41 PM   #45
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Got the fuel pressure gauge installed late last night. Seems to be running right in range. From about 38-60psi depending on vacuum and boost.

I also got an Ignition coil in, so ill be doing some testing with that later.
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Old 11-16-2012, 12:43 PM   #46
easterbran
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Quote:
Originally Posted by simpsonsdotcom
Got the fuel pressure gauge installed late last night. Seems to be running right in range. From about 38-60psi depending on vacuum and boost.

I also got an Ignition coil in, so ill be doing some testing with that later.
Cool, let keep us posted!
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Old 11-16-2012, 03:17 PM   #47
enjoi1968
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I didn't read all the replys,but I had similar issues last week, turned out to be a clogged injector.

Edit: you never had a code thrown? (Sans the O2 code). If you're getting a miss on a certain cylinder, move the coil from one cylinder to another and see if it follows.

Even with good fuel pressure an injector could be clogged.
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Old 11-16-2012, 06:20 PM   #48
simpsonsdotcom
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Nope other than the O2 never had a code

So finally got a chance to play with the ignition coils.
Replaced cylinder 1 first. Test drove. Seemed to run a little smoother in low RPMs but no difference at WOT.

Moved to cylinder 3. Test drove. Stumbled a little on start up (at the time wasnt sure if this was a good or bad thing). Not much change at low RPMs, but runs great under WOT!!!!

Solved!!

Going to order 3 more coils right now
Thanks everyone!
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Old 11-18-2012, 12:23 AM   #49
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Glad to hear you've almost solved your issue and that Garrets old car is still putting around!
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Old 11-20-2012, 03:32 PM   #50
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I think I'm having the exact same issue on my 03 WRX wagon that I just bought, but I am not sure. I don't want to go throwing money at it in hopes that it'll fix it, but I want it to be fixed. I need to hook up my wideband and see what kind of AFR's I'm running. Any other signs of a bad coil? I'm going to do a smoke test on it today and check for leaks.
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