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12-22-2017, 01:23 AM | #1 |
Scooby Newbie
Member#: 359871
Join Date: Jun 2013
Location: New jersey
Vehicle:2004 Wrx STI WRB |
15 wrx misfire? I think?
Leave the gym, turn car on and immediately rough idle. Pull the access port counts and cyclinder 4 is going crazy going up to 100 and cyclinders 1-3 show 15. Car sounds like a EJ.
3 miles from home so figure I’ll hazard light my car home slowly. Half way through the drive everything reverts back to 0 and the car is running perfectly fine. Engine reverts back to same FA noise. DAM stayed at 1 the entire time. Let it sit a hour then go for a drive and is like nothing ever happened. Did some mild pulls and everything is perfect. What the **** happened? Lmao This is my fourth Subaru and it’s bringing back EJ memories!
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12-22-2017, 01:32 AM | #2 |
Scooby Newbie
Member#: 459849
Join Date: Dec 2016
Chapter/Region:
MWSOC
Vehicle:2002 Legacy GT 89N (titanium pearl) |
Fouled plug, dying coil pack, dying injector. That's where I'd start looking.
Could be a bad ground, but that shouldn't just screw with one cyl. |
12-22-2017, 01:59 AM | #3 |
Scooby Newbie
Member#: 359871
Join Date: Jun 2013
Location: New jersey
Vehicle:2004 Wrx STI WRB |
IS there a way I can see if the injector is dieing through the accessport?
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12-22-2017, 08:39 AM | #4 |
Scooby Specialist
Member#: 378214
Join Date: Jan 2014
Chapter/Region:
Tri-State
Location: Blue Hole
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Sadly no. Injector PW, DC, Fuel Trims, Fuel Pump DCs wont expose it.
Sounds like you clogged up the injectors, especially #4. Bad/contaminated fuel, dirty pre filter, in-tank LPFP filter will do it or.. have you by any chance ran the tank dry (to E) and drove say 10-25 miles like that? Or have a habit of running the tank nearly dry? That will do it. Last edited by Perscitus; 12-22-2017 at 10:18 AM. |
12-22-2017, 10:41 AM | #5 |
Scooby Newbie
Member#: 452248
Join Date: Aug 2016
Chapter/Region:
MWSOC
Location: Cleveland Ohio
Vehicle:2017 Base WRX WRB |
How many miles are on the car? Any mods besides the AP?
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12-22-2017, 04:16 PM | #6 |
Scooby Newbie
Member#: 359871
Join Date: Jun 2013
Location: New jersey
Vehicle:2004 Wrx STI WRB |
STAge 2 with water injection with all supporting cooling mods. Uh tank wise, the car sits a lot . I have a another car I drive more.
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12-22-2017, 07:38 PM | #7 |
Scooby Specialist
Member#: 378214
Join Date: Jan 2014
Chapter/Region:
Tri-State
Location: Blue Hole
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Sitting a lot is no big deal unless it sits nearly empty.
The question is do you tend to run it dry or nearly dry or did you do that recently? If so, you clogged the injectors, particularly #4. I bet if you swapped it over to Cyl 1 or 2, the misfires would follow. If so, you've got your culprit. |
12-23-2017, 02:50 AM | #8 |
Scooby Newbie
Member#: 397935
Join Date: Aug 2014
Location: Sydney, Australia
Vehicle:2014 Forester XT |
Do you have a check valve in you water/meth injection? Where is it located in the system?
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12-23-2017, 10:12 AM | #9 |
Scooby Specialist
Member#: 453427
Join Date: Aug 2016
Chapter/Region:
MWSOC
Location: Detroit, MI
Vehicle:2017 WRX Crystal White Pearl |
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12-23-2017, 11:16 PM | #10 |
Scooby Newbie
Member#: 359871
Join Date: Jun 2013
Location: New jersey
Vehicle:2004 Wrx STI WRB |
Edited below
Last edited by serrius; 12-23-2017 at 11:26 PM. |
12-23-2017, 11:25 PM | #11 |
Scooby Newbie
Member#: 359871
Join Date: Jun 2013
Location: New jersey
Vehicle:2004 Wrx STI WRB |
Yes on the valve , tapped into my intercooler ( mishimoto ). There have been plenty of times Of me driving with the gas light on, more just out of laziness of getting gas tomorrow.
I have a S4 which I drive 90% of the time, so I’m sure it’s sat with the gas light on for a few days. Never gave it thought that it could clog the injectors. Learn something new everyday huh I ordered a injector flush kit so I’ll just pull the injectors and clean them and run a few bottles of cleaner also. I’ve been driving the wrx since and it’s running perfect. No low oil, no dam changes, AFR/DAM good. Actually the only hiccup I’ve ever had owning the Subaru since 2015, I literally baby this thing and am critical on all parts and maintence. no misfires what so ever after the event except the occasional 1 count ever now and then which has happened since it had 300 miles - its Normal for cars to have minimal roughness during a drive. Literally stopped and went back to normal when I was lugging it home. All good now, Nothing across all cylinders |
12-24-2017, 08:56 AM | #12 |
Scooby Specialist
Member#: 378214
Join Date: Jan 2014
Chapter/Region:
Tri-State
Location: Blue Hole
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Sounds good and yes, you most likely sucked up some debris from the tank.
It cleared this time, sometimes it doesn't (got lucky). When she's at 30 or 60K swap out the in-tank pre-filter and LPFP filter. |
12-26-2017, 11:03 PM | #13 |
Scooby Newbie
Member#: 359871
Join Date: Jun 2013
Location: New jersey
Vehicle:2004 Wrx STI WRB |
Spoke to soon!
Put in new coil packs along with spark plugs. The misfire only happens towards the very end of my power band near red line only in 2nd and fourth gear in cylinder 4. I get counts anywhere from 1-8. Third gear wot produces one count very rarely at the end of the band which I attribute to the engine going back to a moderate Rpm as I let go of the throttle. I ran 3 bottles of injector cleaner for safe measure. I’m just stumped. I emailed my tuner on possible fuel trims since I never really monitored roughness before and all my tune pulls are in 3rd so I could have had this prior and not had a clue. Fuel pump, clogged injector 4 or fuel trims? But if it was a clogged injector why only at the end of WOT and not during the whole thing? Pulling the injectors looks like a pain in the ass so I’m trying everything before I attempt on removing them. |
12-27-2017, 06:05 AM | #14 |
Scooby Newbie
Member#: 359871
Join Date: Jun 2013
Location: New jersey
Vehicle:2004 Wrx STI WRB |
Just purchased a DW65c to rule out the fuel pump but I’m a little confused on the in tank filter. The DW has its own filter I get that but The 15 wrx doesn’t seem to use the big white container fuel filter which previous models used that went inside with the pump.
Upon searching I found this 42072AA121 but it goes to the secondary fuel pump sender. Where is the secondary fuel pump sender? |
12-30-2017, 12:46 AM | #15 |
Scooby Newbie
Member#: 439220
Join Date: Jan 2016
Location: New Jersey
Vehicle:2016 WRX CWP |
15 wrx misfire? I think?
Change your gas, believe it or not I’ve had the same issue and swapped my plug and changed the coil packs around and nothing. Emptied my tank and filled up with fresh 93 and boom, problem solved. Something so simple and it seems impossible to locate the issue. Did compression test to be safe and came back in perfect condition. I even ran injector and fuel pump cleaner through before I refilled and after I refilled.
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12-30-2017, 07:53 AM | #16 | |
Scooby Specialist
Member#: 283429
Join Date: May 2011
Chapter/Region:
South East
Location: Down yonder.
Vehicle:2016 Fuji Sunfire 03 Silver |
Quote:
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12-30-2017, 10:04 PM | #17 |
Scooby Newbie
Member#: 76992
Join Date: Dec 2004
Location: Eugene, OR
Vehicle:2015 WRX White |
Only time I experienced the "backfire" on the FA20 on my 2015 WRX was after 2 weeks of Chevron CAN 91. Happened at 3500-4000' of elevation on CA/OR border on morning startup on my way home to Seattle (hwy 395).
Car has sub 24,000 mi on it and only time I've ever experienced that. I am convinced it is a quality of gas thing. I put nothing but Shell in the car, and 3 pump Shell as much as possible. I am fully convinced quality of gas is a massive factor in performance of these engines. I'm only stage 1 OTS Cobb and have seen the DAM differences in different gas station additives. Shell is my go to. Food for thought, hope it helps |
04-02-2021, 06:41 AM | #18 |
Scooby Newbie
Member#: 359759
Join Date: Jun 2013
Chapter/Region:
MWSOC
Location: Cleveland, Ohio
Vehicle:2016 WRX Dark Grey Metallic |
I realize this is a dead thread but I’m wondering if you ever found a solution? I am currently trying to diagnose almost the exact same issue. Did the new fuel pump solve the issue? If you see this reply please let me know!
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