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Old 02-10-2019, 02:42 PM   #1
akirk92
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Default 2011 WRX boosting problems past 12psi

I've had this issue for a while and feel like I've gone through everything. Basically, under load and after 12psi, my car starts sputtering and hesitating. I've changed the spark plugs, no luck. Got it smoked tested and found a leak on the stock BPV. I replaced it and still have the same symptoms. I was getting a P1152 Front O2 sensor error code so I swapped that out and the issue persists. Now when I put the engine under load I still get the same hesitating behavior but no error code. Any one have any ideas what else can be done?
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Old 02-10-2019, 08:57 PM   #2
JMJGH8
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I had the same problem last summer. Replaced cylinder 4 spark plug and it got better for a week. Replaced the coil pack the next week with one from auto zone and problem solved. I could tell which cylinder the problem was in by watching the cylinder roughness on my access port when it started breaking up. 2011 wrx here too
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Old 02-10-2019, 10:32 PM   #3
navamous
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Have you checked your up-pipe? Whats the background on your ride?
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Old 02-11-2019, 07:39 AM   #4
akirk92
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Good idea, I'll see what the engine roughness output is.

I haven't checked my uppipe, what should I be looking for?

Specs:
Process West fmic
Stock turbo
1000cc injectors
Walbro 255
E85
Grimmspeed EBCS
Grimmspeed downpipe
Cobb intake
Turbosmart BPV
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Old 02-11-2019, 08:41 AM   #5
akirk92
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Ok I just monitored the engine roughness and under load I get counts on cyl 3. This measures engine misfire correct? How can I be sure it's the coilpack, injector or spark plug?
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Old 02-11-2019, 09:13 AM   #6
viper_crazy
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Yes, roughness monitors count per cylinder misfires.

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Old 02-11-2019, 11:29 AM   #7
akirk92
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Awesome, thanks. Any ideas how I can more accurately troubleshoot what's going on with Cyl 3?
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Old 02-11-2019, 12:06 PM   #8
Turpid Porpoise
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Move the coil pack on cylinder 3 to another cylinder and see if the problem follows the coil pack.
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Old 02-11-2019, 12:25 PM   #9
Stretch18
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Yup, coil packs are probably the issue.
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Old 02-11-2019, 01:13 PM   #10
akirk92
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Yeah I figured someone would say that. Accessing the coilpacks are no fun!

Thanks! I'll update and see if that works
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Old 02-11-2019, 01:38 PM   #11
Zcypot
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coil packs going bad on a 2011 is very rare, but worth a check if you can do it yourself.
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Old 02-12-2019, 02:02 PM   #12
WRXislander
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Update?

Quote:
Originally Posted by akirk92 View Post
Yeah I figured someone would say that. Accessing the coilpacks are no fun!

Thanks! I'll update and see if that works
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Old 02-12-2019, 02:06 PM   #13
akirk92
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I plan to tackle this over the weekend
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Old 02-16-2019, 12:38 PM   #14
akirk92
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I swapped the coil pack to cyl1, and the misfire followed. I have a new one in there now and I'm finally able to hit boost without any hesitating or sputtering. My tune is for 19psi but I'm only hitting 17 now...and I'm now getting misfire codes on cyl4 at high rpms



Spoke too soon. Cyl4 is causing the same symptoms I had before now

Last edited by akirk92; 02-16-2019 at 12:45 PM.
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Old 02-19-2019, 08:42 AM   #15
akirk92
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I haven't had a chance to troubleshoot cyl4 but I plan on it in the coming week. I'll probably start by switching the coil packs again and seeing what that does.

Now that I'm monitoring roughness, I notice that I get misfired on almost all cylinders on cold starts. Once warm, there's no issues. At least until I boost and cyl4 starts misfiring. Could this be symptoms of foul or poorly gapped plugs?
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Old 02-19-2019, 09:30 AM   #16
Turpid Porpoise
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Check your grounds, if you have bad ground for the coil packs it can cause issues like this. Checking plugs wouldn't hurt either.

Are you still getting P1152?

Has this car been protuned for the mods you have listed?
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Old 02-19-2019, 10:51 AM   #17
akirk92
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No, that error code stopped after I swapped in the new O2 sensor. I'm actually not getting any error codes right now, I'm just reading out engine roughness to see where I'm misfiring. But I guess it's not enough counts to set off the ECU? Not sure.

I'm not protuned. I'm using an E tune from torqued performance. But after I sort this out I do plan on getting a protune
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Old 02-19-2019, 03:09 PM   #18
JMJGH8
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Glad to hear sweeping the cool pack fixed the problem on cylinder 3. If you don't have a damaged plug I would guess the problem with 4 is just another bad coil pack if the symptoms are the same. Only downside is you have to pull the battery to swap cylinder 4, but still a pretty easy fix. Good luck!
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