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Old 11-07-2013, 12:54 PM   #1
BeastianSTI
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Member#: 310506
Join Date: Feb 2012
Chapter/Region: South East
Location: Florida
Vehicle:
2005 WRX STi
Silver, Sexy 'n Raspy

Exclamation HELP - Car randomly falls on face 1st gear

Hey guys,

Car:

2005 STi

Mods:
  • Open-source tuned of course!
  • Walbro FP - normal one everyone gets
  • Green CAI filter
  • APS 65mm CAI
  • APS Hard TIP
  • AfterMaf Hose
  • TurboXS TMIC
  • Stock BPV
  • TGV Deletes
  • GS Phenolic Spacers 8mm
  • Turbo back exhaust
  • Perrin Uppipe

Symptoms:
  • 75% of time the car falls on its face out of first gear ( not flooring it, but just normal driving )
  • A bit above normal 'ticking' noise from driver side. Increases with RPM, not relative to car moving.
  • Even though wideband shows normal AFR's, friends mentioned when I drove by in first gear, it smelled like straight up gasoline. Fuel pressure is fine, no fuel leaks.
  • Sometimes at idle the car shakes a bit, and sometimes you can hear a "poof" in the exhaust. I'd imagine that's what a miss sounds like at idle?
  • Kind of feels like the engine is out of balance, maybe?

What has been done:
  • Compression test - All cylinders within spec
  • Front o2 sensor - replaced...
  • Swapped MAF - No difference
  • Replaced all spark plugs with LF6AIX-11 - gapped to .29 per tuner
  • Cleaned MAF
  • Intake track confirmed to have no leaks ( smoke test )
  • LTFT's are less than 5%

Here are the spark plugs as of a few weeks ago:



The top left spark plug is driver side closest to radiator, and the others are oriented following that pattern ( from driver seat perspective ).

This has been driving me nuts for a while. Car seems a little bit low on power across the band, and sometimes the engine shakes under higher load.

Let me know if you guys want any further information!!!

Thanks !!!
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Old 11-07-2013, 01:43 PM   #2
dstroy
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Join Date: May 2011
Chapter/Region: NESIC
Location: Newport
Vehicle:
2012 STI sedan
Black with scratches

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That top left spark plug is toast. You need to get your injectors cleaned and flow tested. That dry black soot is from running super rich for a long time.
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Old 11-07-2013, 02:59 PM   #3
BeastianSTI
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Join Date: Feb 2012
Chapter/Region: South East
Location: Florida
Vehicle:
2005 WRX STi
Silver, Sexy 'n Raspy

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Quote:
Originally Posted by dstroy View Post
That top left spark plug is toast. You need to get your injectors cleaned and flow tested. That dry black soot is from running super rich for a long time.
Hmmm - how sure are you about this? I was thinking the plug may be fouled as well; I suppose that injector could be getting stuck open or something like that, hence the ticking noise?
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Old 11-07-2013, 03:54 PM   #4
dstroy
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Black with scratches

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Pretty sure, running rich is what it looks like. Here's a chart for reference:
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Old 11-07-2013, 04:30 PM   #5
BeastianSTI
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2005 WRX STi
Silver, Sexy 'n Raspy

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Hmm - so it could either be a bad/stuck injector or a bad coilpack?
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Old 11-07-2013, 04:48 PM   #6
dstroy
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Black with scratches

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Yeah, easy enough to swap around. But you're not getting any misfire codes, so it'd be hard to tell if it was the coilpack.
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Old 11-07-2013, 05:31 PM   #7
BeastianSTI
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Member#: 310506
Join Date: Feb 2012
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2005 WRX STi
Silver, Sexy 'n Raspy

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Yeah, that wont really help. Anybody know of other ways to test for those sort of things?
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Old 11-07-2013, 05:32 PM   #8
codesoccer
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Flip Flop Tuned on corn

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You could try cleaning the crank and cam sensors...free, easy, and something else to rule out.
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Old 11-07-2013, 05:43 PM   #9
BeastianSTI
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Join Date: Feb 2012
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2005 WRX STi
Silver, Sexy 'n Raspy

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Quote:
Originally Posted by codesoccer View Post
You could try cleaning the crank and cam sensors...free, easy, and something else to rule out.
Could those sensors cause a single cylinder to be rich?

I cleaned the Crank sensor a couple of months ago :S
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Old 11-07-2013, 06:08 PM   #10
codesoccer
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2002 MBP Bugeye
Flip Flop Tuned on corn

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Quote:
Originally Posted by BeastianSTI View Post
Could those sensors cause a single cylinder to be rich?

I cleaned the Crank sensor a couple of months ago :S
Actually not that I'm aware of
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Old 11-07-2013, 06:14 PM   #11
dstroy
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2012 STI sedan
Black with scratches

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You can swap in a known working injector from a friend and a new sparkplug. Or you can switch that injector to another cylinder and see what happens to that sparkplug. Finally, you could just get your injectors sent out and flow tested/cleaned.
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Old 11-07-2013, 07:24 PM   #12
BeastianSTI
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Join Date: Feb 2012
Chapter/Region: South East
Location: Florida
Vehicle:
2005 WRX STi
Silver, Sexy 'n Raspy

Default

Lol it's my dd and I live alone so I'm tryin not to have any down time if possible. Hmm ...
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