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03-10-2014, 04:56 PM | #1 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
2006 WRX not boosting past/stuttering at 10 psi
This 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 . 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.
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Last edited by Chris-pee; 03-11-2014 at 07:03 AM. |
03-10-2014, 08:00 PM | #2 |
Scooby Specialist
Member#: 241943
Join Date: Mar 2010
Location: NNJ
Vehicle:2065 Magic Carpet Swirl Rally Bleu |
My first thought was plugs/plug gap or something else ignition related. But those codes add a new element.
Strange. Sub'd for updates. Bump for you. |
03-10-2014, 08:59 PM | #3 |
Scooby Specialist
Member#: 279525
Join Date: Apr 2011
Chapter/Region:
Tri-State
Location: QUEENS NY
Vehicle:06 Fxt |
Run another datalog (shorter), and include the injector parameters. Maybe that'll give more insight to whats going on. Your DAM (dynamic advance multiplier) is at .75 which is not the worst thing in the world but not good either.
Other than data logging i would Try reducing the gap on your plugs first or swapping them out for new plugs all together. |
03-10-2014, 09:28 PM | #4 |
Scooby Specialist
Member#: 157764
Join Date: Aug 2007
Chapter/Region:
TXIC
Location: Wichita Falls TX
Vehicle:2002 '02 SZ55 hyb 2002 v9 EJ207 VF22 wagon |
Grounding issue. I'm callin it.
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03-10-2014, 10:49 PM | #5 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
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03-10-2014, 11:03 PM | #6 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
In that vein, what are the stock grounding points besides the neg cable?
Last edited by Chris-pee; 03-11-2014 at 07:03 AM. |
03-11-2014, 09:24 AM | #7 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
Here is a log from this morning, 3rd gear.
https://docs.google.com/spreadsheet/...EE&usp=sharing It threw a new code this morning, Cylinder 1 misfire. Also a code that said PFFFF. I forgot to log injector parameters. Ill take another log today. |
03-12-2014, 03:45 PM | #8 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
The misfire at 10psi is now a misfire at all rpms. From idle and up.
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03-12-2014, 04:36 PM | #9 |
Scooby Newbie
Member#: 371409
Join Date: Oct 2013
Chapter/Region:
RMIC
Location: Fort Collins, CO
Vehicle:2006 WRX TR Black |
My car was acting similar a few weeks back. Rough idle and violent bucking at 6K through all gears Replaced my front o2 sensor and it's gone.
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03-12-2014, 10:23 PM | #10 |
Scooby Specialist
Member#: 358782
Join Date: Jun 2013
Chapter/Region:
MWSOC
Location: Springfield, Illinois
Vehicle:2013 STi DGM |
Have you checked you speed sensor... I mean you do have a code for it!?.
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03-19-2014, 07:29 AM | #11 | |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
Quote:
Added three grounds, changed plugs again. Check for vacuum, boost leaks. Here is a new datalog with injector information. Does the duty cycle seem low? This is 3rd gear https://docs.google.com/spreadsheet/...rive_web#gid=0 |
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03-19-2014, 07:40 AM | #12 |
Scooby Specialist
Member#: 283711
Join Date: May 2011
Chapter/Region:
NESIC
Location: Newport
Vehicle:2012 STI sedan Black with scratches |
Clean your MAF, check the wiring to your front O2 sensor and make sure it isn't melted. There's a ground pack right in front of the coolant expansion tank on the intake manifold, that's where the main engine harness ecu ground is located. Tear in your inlet after the MAF would do this also. So would a boost leak, did you remove the TMIC and check both hoses?
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03-19-2014, 08:07 AM | #13 | |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
Quote:
To the firewall and the main ground by the starter. Pulls 20 inhg at idle. Runs perfectly fine until 10psi. I checked the 02 wiring as well. It clear of everything and physically in good shape. |
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03-19-2014, 08:25 AM | #14 |
Scooby Specialist
Member#: 283711
Join Date: May 2011
Chapter/Region:
NESIC
Location: Newport
Vehicle:2012 STI sedan Black with scratches |
Try pulling your inlet off and check turbo play.
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03-19-2014, 09:12 AM | #15 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
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03-19-2014, 04:58 PM | #16 |
Scooby Specialist
Member#: 241943
Join Date: Mar 2010
Location: NNJ
Vehicle:2065 Magic Carpet Swirl Rally Bleu |
Might be worth a compression test, possibly a weak coil pack in that cylinder? Were the new plugs gapped properly?
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03-19-2014, 05:03 PM | #17 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
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03-19-2014, 05:05 PM | #18 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
What are some signs of low commpression? If any.
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03-20-2014, 03:20 AM | #19 |
Scooby Specialist
Member#: 383633
Join Date: Mar 2014
Chapter/Region:
RMIC
Location: Yampa, CO
Vehicle:2002 Impreza WRX Silver |
Vacuum gauge will bounce around alot when hooked to the intake port if the a cylinder or 2 is low on compression because those cylinders are using a different amount of air then a higher compression cylinder.
Along with that. The vacuum levels roughly measure the amount of air your engine pulls vs the throttle plate restriction. Higher vacuum levels mean a healther engine drawing more air because the compression is better. It must be noted your vacuum levels vary with alitude and barometric pressure. If your in TX you should be pretty close to XX" on the gauge or something. Compare it to another good engine. The needle should be smooth at idle with no changes or bouncing for the most part. The test gauges are about 15 bucks. Dont rely on your stock boost gauge its not accurate enough to tell much. |
03-20-2014, 03:27 AM | #20 | |
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Member#: 16200
Join Date: Mar 2002
Vehicle:OK buy Nates beans westcoastroasting.com |
Quote:
behind the battery, below the fuse box are 2 LARGE connectors...check them for corrosion and condition |
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03-20-2014, 12:39 PM | #21 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
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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03-20-2014, 02:52 PM | #22 |
Scooby Specialist
Member#: 383633
Join Date: Mar 2014
Chapter/Region:
RMIC
Location: Yampa, CO
Vehicle:2002 Impreza WRX Silver |
Nice. The ol switcharoo. That was almost too perfect. Nice spotting.
Glad you got it fixed. Codes all gone as well I'm guessing. You said violent you were not kiding. It was tossing your drivetrain for a loop to set that 503 and 502 |
03-20-2014, 03:02 PM | #23 |
Scooby Newbie
Member#: 279168
Join Date: Apr 2011
Chapter/Region:
TXIC
Location: Fort Worth
Vehicle:2006 WRX TR stage 2 WRB |
Thank you. The codes, funny story. Turns out If you pull the codes with the green test connectors plugged in you get those codes. Next time I will remove my head from my ass before attempting any repairs.
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03-20-2014, 03:43 PM | #24 |
Scooby Specialist
Member#: 283711
Join Date: May 2011
Chapter/Region:
NESIC
Location: Newport
Vehicle:2012 STI sedan Black with scratches |
lol glad its fixed
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03-21-2014, 04:28 PM | #25 |
Scooby Specialist
Member#: 241943
Join Date: Mar 2010
Location: NNJ
Vehicle:2065 Magic Carpet Swirl Rally Bleu |
Often times, stuttering is ignition related.
I've had similar issues on several turbocharged cars in the past, and it's almost always been ignition related |
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