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-   -   2006 WRX not boosting past/stuttering at 10 psi (http://www.wrxtuners.com/forums/f72/2006-wrx-not-boosting-past-stuttering-10-psi-45721/)

Chris-pee 03-12-2014 07:31 AM

2006 WRX not boosting past/stuttering at 10 psi
 
[COLOR="Red"][/COLOR]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 .

[COLOR="SeaGreen"]EDIT, FOR EXPLANATION OF THESE CODES KEEP READING. POST #11[/COLOR].

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.
[url]https://docs.google.com/spreadsheet/...VE&hl=en#gid=0[/url]

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

Chris-pee 03-12-2014 07:33 AM

Here is a log from yesterday morning, 3rd gear.

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

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

[url]https://www.youtube.com/watch?v=sn_36m5mkts&list=UUzLIRwYSj7E4u3Z2TCXBvMw[/url]

pzr2874 03-12-2014 09:01 PM

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

Chris-pee 03-15-2014 05:58 PM

[quote=pzr2874;440433]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[/quote]


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.

Chris-pee 03-15-2014 05:59 PM

By the datalogs it seems to get to about 11.5 psi so I don't think it's at spring pressure.

06_hawk_eye 03-15-2014 07:19 PM

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


[color=gray]Sent from [url=http://www.autoguide.com/mobile]AutoGuide.com App[/url][/color]

Chris-pee 03-15-2014 08:04 PM

[quote=06_hawk_eye;441169]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


[color=gray]Sent from [url=http://www.autoguide.com/mobile]AutoGuide.com App[/url][/color][/quote]

I took a quick video, thanks for the help.
http://youtu.be/9h-5x9aeGek

06_hawk_eye 03-15-2014 08:28 PM

[quote=Chris-pee;441209]I took a quick video, thanks for the help.
[url]http://youtu.be/9h-5x9aeGek[/url][/quote]

Video link is bad man.
Edit never mind

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Bubba James 03-17-2014 08:37 AM

1 Attachment(s)
[quote=06_hawk_eye;441169]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


[color=gray]Sent from [url=http://www.autoguide.com/mobile]AutoGuide.com App[/url][/color][/quote]

Where was this grounding point? I'm having a similar issue. Are there numerous ground points to check for this problem?

06_hawk_eye 03-17-2014 08:46 AM

On the intake manifold right by the turbo inlet.


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Chris-pee 03-18-2014 11:31 AM

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.

Chris-pee 03-19-2014 07:31 AM

Here is a datalog from 3rd gear with injector information logged if this helps any, thanks

[url]https://docs.google.com/spreadsheet/ccc?key=0AjcbUXQ0tnD8dFp6dkYyNGxLejVnVm1MMlFUOERnWlE&usp=drive_web#gid=0[/url]

Chris-pee 03-21-2014 06:54 AM

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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