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Old 09-24-2017, 04:22 AM   #1
04stidaily
Scooby Newbie
 
Member#: 404803
Join Date: Oct 2014
Default STI sputtering under load, no CEL

Hello Guy's/Gal's, I am currently dealing with a issue that has plagued my car for the past few months that I have been trying to diagnose by throwing parts at my car related to the problem.

-My problem: Car sputters when trying to get into boost at cruising speeds with more then 50% throttle.

during the event of the sputtering the smell of unburnt fuel becomes apparent. I have noticed looking back in my rear view mirror once during this sputtering event, I noticed what I would guess to be gas shooting out of the tailpipe accompanied by a plume of white-ish smoke.

-My Mods: nvidia catless bellmouth down pipe, Killerbee oil pickup, Tomei Turbo Inlet, accessport w/ COBB OTS ACN Stage 2 map

-Status report: The car currently has 177k on original factory motor/turbo. The clutch has a little over 3k miles. The car does consume oil at a rate that should cause for concern, but I don't notice smoke coming out of the oil fill tube with the cap off while reving the motor, nor do I experience smoke continuously billowing out of my exhaust. So based off of those symptoms I don't believe I have ringland failure or bad turbo seals. I had a compression test done about a year ago, and the shop that performed it told me I didn't have any compression loss, but then again.. that was a year ago.

-Maintenance performed/parts replaced: New Tomei silicone turbo inlet, New OEM spark plugs, New OEM coil packs, New OEM Injectors, New OEM MAF sensor, New OEM front and rear o2 sensors, New Walbro 255 LPH fuel pump /w new fuel filter included.

It's been a few years since a post related to this particular topic has be discussed, I'm hoping within those years others have had other luck with fixes to this problem other then those previously posted. Any help is greatly appreciated, thanks!
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Old 10-05-2017, 12:07 AM   #2
element91
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Member#: 303367
Join Date: Dec 2011
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Any chance you can get a OBD reader and Long term & Short term fueling ?
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Old 10-13-2017, 05:43 AM   #3
04stidaily
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Member#: 404803
Join Date: Oct 2014
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Problem solved. Ended up being loose bolts that hold the hard lines to the TGV’s... I was about to replace my injector seal when I got to those two bolts, I realized they were loose. Me and a buddy of mine recently replaced a fuel hose that was leaking and we ended up taking the manifold off. I figure these were not torqued down when reassembly took place... all this time and money spent on replacing parts chasing this ended up being overlooked loose bolts.
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