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Old 09-25-2013, 11:29 PM   #1
Whoa!ShutItDown
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Member#: 191700
Join Date: Oct 2008
Chapter/Region: Tri-State
Location: Cicero, NY
Vehicle:
04 WRX
silver

Default WOT feels weak...let off gas...WOT feels good

I had some bogging/hesitation issues, tightened up and replaced a few hoses and lines today which seemed to fix that issue. But when I go WOT it builds boost choppy and gets anywhere from 10-15psi, sometimes full boost at 19psi. If I go WOT and it doesnt feel strong I can make it feel right by quickly letting off the gas completely and immediately punch it. But that still doesnt make it hit full boost. Nothing sounds different, I think it might be pulling boost/timing for some reason. I have an Openport 2.0 and can datalog, but not too sure what to look for.

Could that be the TPS going? I cleaned my IACV recently but dont recall if it did that previously. Possibly MAF or knock sensor? I dont think its a vacuum/boost leak, I spent hours today making sure every hose was seated good. I changed 2 lines to my EBCS (ran out of line, couldnt do all 3) but the line was slightly smaller, my local stores either dont carry it or have bad selections so its tough to find the same line from 3 years ago, Ill be looking around again tomorrow

04 WRX at 127k

Blouch 16g-XT turbo
ebay TMIC
Deatschwerks 750cc injectors
Walbro 255lph fuel pump
Tomei 4-1 UEL header w/ catless uppipe
3in catless turbo back exhaust
Cobb Short ram intake
Samco MAF tube
Gimmick turbo inlet
TGV deletes
Grimmspeed EBCS
Perrin light crank pully
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Old 09-26-2013, 12:31 AM   #2
scurran88
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Member#: 365484
Join Date: Aug 2013
Location: Downingtown, PA
Vehicle:
2002 wrx
rally blue

Default

Yeah my 02 wrx does something similar. I can't get on it at all or else it stutters. This is very annoying and I have yet to figure it out.
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Old 09-26-2013, 12:43 AM   #3
pmugabi
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Misfire I would think. What plugs do you have and when did you last change them?
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Old 09-26-2013, 01:25 AM   #4
Whoa!ShutItDown
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Chapter/Region: Tri-State
Location: Cicero, NY
Vehicle:
04 WRX
silver

Default

Ngk bkr7e, just changed them last week, was tuned on bkr7e's. It kinda does feel like a misfire, if I give it gas at low rpm in 4th or 5th it feels like a slight rumble/vibrating. Coil packs don't die slowly do they? I've always heard they just go
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Old 09-26-2013, 08:25 AM   #5
quazimoto
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Location: Da-boonies,Va
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Datalog the car and post it up.
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Old 09-26-2013, 06:00 PM   #6
Whoa!ShutItDown
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silver

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Ill be able to get some datalogs up tomorrow, what parameters should I log?
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Old 09-27-2013, 07:56 AM   #7
quazimoto
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Quote:
Originally Posted by Whoa!ShutItDown View Post
Ill be able to get some datalogs up tomorrow, what parameters should I log?
RPM
PSI
DAM/IAM
Feedback knock correction
fine learning knock correction
throttle position
wgdc
MAF G/S
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Old 09-27-2013, 09:09 AM   #8
Whoa!ShutItDown
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Join Date: Oct 2008
Chapter/Region: Tri-State
Location: Cicero, NY
Vehicle:
04 WRX
silver

Default

Ok ill get those later today. But I did have a second last night to look at it, my IAM is steady at 8, it used to always be 16. I have a new knock sensor to replace the stock one, gonna do that later. I doubt its bad gas cuz I always go to the same stations. I just got the car back on the road, blew the stock 5mt and replaced it with a used one. I didnt inspect the flywheel or clutch, and re-used the throwout bearing, if the clutch was slightly damaged on the hard launch that busted the first tranny could it cause the IAM to be off? And the intake manifold was off in that time to replace a garbage Gimmick inlet, I deleted that black purge valve between inlet and purge solenoid too (2 lines on the solenoid, one goes to manifold and other goes directly to rail under the manifold)
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Old 09-29-2013, 08:15 PM   #9
Whoa!ShutItDown
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Location: Cicero, NY
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silver

Default

One of the wires on my Grimmspeed 3port was pulled out of the connector, I have no idea how that happened but it definitely was the issue.
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Old 09-29-2013, 09:40 PM   #10
jhayesvw
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Location: Tucson AZ
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2003 WRX Wagon
Silver

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its nice when you find the problem. Good deal.
Oh and I'm originally from Central Square NY area. haha. Small world.
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Old 09-30-2013, 10:09 AM   #11
Whoa!ShutItDown
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Member#: 191700
Join Date: Oct 2008
Chapter/Region: Tri-State
Location: Cicero, NY
Vehicle:
04 WRX
silver

Default

It was by far the easiest fix Ive ever had. Ive checked lines and fittings dozens of times, it wasnt until I datalogged and noticed my boost error and wastegate duty cycle correspond with difference in power of WOT.

jhayesvw I bet AZ is way better then CNY, but no snow fun!
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