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Old 10-13-2016, 01:22 AM   #1
mntnceguy
Scooby Newbie
 
Member#: 215259
Join Date: Jun 2009
Location: Denver, Colorado
Vehicle:
2006 Suby WRX Wagon
White

Default 06 WRX stalling, rough idle, no cel, no front O2s signal

Got a stumper here, for me anyway, lol. I have been a mechanic in the past, so I'm not a total noob at this.

2006 Wrx wagon, mildly modified with 19t turbo, turbo back catted exhaust, street tuned, nothing to wild, just a good street driver car. It's been reliable as heck, passes emissions fine. Other than a previous vacuum leak due to my intake hose slipping a few years back, I've had no complaints.

Last week it started sputtering when I left from work, couldn't even leave the parking lot. NO CEL. It takes about 5 or more cranks to fire up, idle goes to 1500-1800, then idle starts to come down, may bounce back up, then starts to run rough like it's misfiring, and dies. I've cleaned the MAF and IAT, replaced the fuel pump, checked the FPR, visually checked for vacuum leaks although I don't hear anything leaking, oil level good, coolant good, no major leaks. Today I finally got my romraider working again (damn java updates), and was able to start watching graphs. I immediately saw that my front O2s was flatlined at the top of the scale, and wasn't ranging. So I'm thinking, woohoo, figured it out. Nope, new sensor installed, still not ranging. The only cel I've gotten so far is after I've unplugged a sensor to test it, clear the cel and nothing comes back, it just won't run. Engine sounds fine at the higher idle, no knocks, squeels, taps, nothing sounds mechanically wrong. All other sensors, MAF, rear O2s, IAT, MAP etc. are ranging like I'd expect, just nothing from the front O2s. I guess I could try another front O2s, maybe it was bad out of the box, but that'd be quite rare for this kind of part I believe.

Honestly, just posting this on the off chance that some guru like Unabomber takes pity on me a shoots out some overlooked suggestions...Thx for looking
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Old 10-13-2016, 08:09 AM   #2
Max Capacity
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Member#: 149347
Join Date: May 2007
Chapter/Region: NESIC
Location: Tolland, CT
Vehicle:
05 LGT,09 SpecB
Black/silver

Default

FWIW, just from reading some of the idle issue threads, have you cleaned the oil control valves ?

Seems some have had luck doing that.
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Old 10-24-2016, 10:09 PM   #3
mntnceguy
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Member#: 215259
Join Date: Jun 2009
Location: Denver, Colorado
Vehicle:
2006 Suby WRX Wagon
White

Default

Well, turns out it was the in-tank fuel filter o-ring that had pushed out, limiting my fuel pressure, starving the system. Wish I hadn't sold my inline fuel pressure gauge years ago, or I might have figured it out myself. Just posting in case anyone else runs into this in the future, as my searches didn't help me this time
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