2006 WRX not boosting past/stuttering at 10 psi - Subaru WRX Forum
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post #1 of 13 Old 03-12-2014, 07:31 AM Thread Starter
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2006 WRX not boosting past/stuttering at 10 psi

Monday morning my car, 06 Wrx Cobb ots stage 2 catless DP with 104k , started bucking harshly at 10 psi no matter what gear I was in. Pulled codes and there was 6.

P1518-starter switch input low
P0851-neutral switch input low
P1153-02 B1 input high
P1152-02 B1 input low
P0502-speed sensor input low
P0503-speed sensor input erratic .

EDIT, FOR EXPLANATION OF THESE CODES KEEP READING. POST #11.

The next day, it threw a cyl #1 misfire code and a code that said PFFF

Any ideas? Idles fine and runs smooth until 10psi when it bucks and check engine light starts flashing.

This is a short log of 1st and 2nd gear. I didn't want to force it to boost much more because of how violent it feels when the stuttering happens.
https://docs.google.com/spreadsheet/...VE&hl=en#gid=0

Any insight? I have had has this map on the car for 20k plus with no issues.

Last edited by Chris-pee; 03-18-2014 at 11:37 AM.
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post #2 of 13 Old 03-12-2014, 07:33 AM Thread Starter
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Here is a log from yesterday morning, 3rd gear.

https://docs.google.com/spreadsheet/...EE&usp=sharing

I just put stock replacement Denso plugs in the car a month ago, pulled the #1 plug last night and it looked normal.

Crappy video for reference

https://www.youtube.com/watch?v=sn_3...7E4u3Z2TCXBvMw
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post #3 of 13 Old 03-12-2014, 09:01 PM
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wgd is set at 9psi IIRC. Check for a vac/boost leak. Shot in the dark.

Have you done the 105k maint yet?

BTW...don't let your car dip below a 1/8-1/4 tank

Paul
2002 WRX Sold
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post #4 of 13 Old 03-15-2014, 05:58 PM Thread Starter
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Quote:
Originally Posted by pzr2874 View Post
wgd is set at 9psi IIRC. Check for a vac/boost leak. Shot in the dark.

Have you done the 105k maint yet?

BTW...don't let your car dip below a 1/8-1/4 tank

I have not done the 105k yet, its going to have to wait until next month. With the codes I am getting, people keep suggesting a bad ground but for the life of me I can't seem to find one. I added three grounds and checked all the connectors and wiring I can access. Problem still persist.
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post #5 of 13 Old 03-15-2014, 05:59 PM Thread Starter
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By the datalogs it seems to get to about 11.5 psi so I don't think it's at spring pressure.
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post #6 of 13 Old 03-15-2014, 07:19 PM
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I was having a similar problem and it was a bad ground on the intake manifold. Take a picture of your engine bay and ill circle the one that was loose on mine


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post #7 of 13 Old 03-15-2014, 08:04 PM Thread Starter
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Quote:
Originally Posted by 06_hawk_eye View Post
I was having a similar problem and it was a bad ground on the intake manifold. Take a picture of your engine bay and ill circle the one that was loose on mine


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I took a quick video, thanks for the help.
http://youtu.be/9h-5x9aeGek
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post #8 of 13 Old 03-15-2014, 08:28 PM
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Quote:
Originally Posted by Chris-pee View Post
I took a quick video, thanks for the help.
http://youtu.be/9h-5x9aeGek
Video link is bad man.
Edit never mind

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post #9 of 13 Old 03-17-2014, 08:37 AM
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Quote:
Originally Posted by 06_hawk_eye View Post
I was having a similar problem and it was a bad ground on the intake manifold. Take a picture of your engine bay and ill circle the one that was loose on mine


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Where was this grounding point? I'm having a similar issue. Are there numerous ground points to check for this problem?
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post #10 of 13 Old 03-17-2014, 08:46 AM
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On the intake manifold right by the turbo inlet.


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post #11 of 13 Old 03-18-2014, 11:31 AM Thread Starter
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It turns out, I am an idiot. These are the codes you get when you leave the damn test connectors plugged in while trying to read codes. So in reality, the thing throws a misfire code for cyl 1 or for cyl 3 randomly. Still wont boost smoothly from 10psi +. I changed the plugs (again), added three grounds, topped it off with fresh gas and checked all connectors and vacuum lines. Swapped coils around as well.

I am officially out of ideas.
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post #12 of 13 Old 03-19-2014, 07:31 AM Thread Starter
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Here is a datalog from 3rd gear with injector information logged if this helps any, thanks

https://docs.google.com/spreadsheet/...rive_web#gid=0
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post #13 of 13 Old 03-21-2014, 06:54 AM Thread Starter
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Its a long ignorant story, but I fixed it! It turned out being the #1 coil. At first I put a new coil onto a broken spark plug on #1. It didn't help so I ruled out the coil. Never thought to test it again after I found out the plug was broken. Pretty sure I fixed a boost leak in all of this though so it wasn't all for naught. Thank you to everyone that chimed in, I really appreciate it. Car runs better than ever.
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