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05-08-2010, 07:04 PM | #1 |
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Please help! Misfire,running rich, wont idle...
ok so heres some background,
my car is an 02 wrx with a complete sti swap (wiring and everything) , so its basically 04 sti... heres the problem Car wont idle, wont build boost under load, revs fine cold and not under load, spitting a lil smoke like its running rich, misfire on cylinders 1,3, and 4. im going to do a compression test soon. ill post a pic of spark plugs in a sec...but all of them look the same. they are black except for the tips, they look lean... its weird.... any ideas??? thanks nasioc!!!!
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05-08-2010, 07:15 PM | #2 |
Scooby Specialist
Member#: 142752
Join Date: Mar 2007
Chapter/Region:
SCIC
Location: Mission Viejo, CA
Vehicle:2008 WRX STi White |
mileage on the engine? completely stock STI setup? check for spark from the coils?
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05-08-2010, 07:20 PM | #3 |
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supposedly around 50k, all stock, and its getting spark, could it be low spark? how would i test?
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05-08-2010, 07:27 PM | #4 |
Scooby Newbie
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Join Date: Sep 2009
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05-08-2010, 07:32 PM | #5 |
Scooby Newbie
Member#: 238958
Join Date: Feb 2010
Chapter/Region:
MWSOC
Location: Parma, Ohio
Vehicle:2009 Impreza WRX OBP |
looks like your getting oil on the plugs other then that the tips actually look a normal color
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05-08-2010, 09:46 PM | #6 | |
Scooby Specialist
Member#: 142752
Join Date: Mar 2007
Chapter/Region:
SCIC
Location: Mission Viejo, CA
Vehicle:2008 WRX STi White |
Quote:
i don't know of a way to check but also i don't know of a cause that would make low voltage across multiple coils other than a damaged harness... worth a check but i think it'd be something else... can you pull the fuel trims? if it's trying to pull fuel i'd start by checking the condition of the injectors and make sure the plunger is completely closing off the spray completely. Again, these seems like an unlikely cause since it's happening at more than one cylinder, but it's worth a check if the ECU is actively trying to pull fuel. If you're ECU is dumping the fuel in on the other hand, i'd make sure your timing is correct & haven't jumped a tooth on the belt. If that is all good, head to a tuner. |
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05-09-2010, 12:06 AM | #7 |
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well i got to thinking and im going to flash a stock map to it using my accessport... i havent installed it yet but im thinking maybe the ecu has been messed with or something... maybe its tuned for larger injectors or something. its def not oil. , its running super rich , at 1500rpm the timing is around 25*advanced... soo something is up. Im not very experienced with tuning and whatnot , but im trying... i need a taxtric cable! lol Anyone know if i could use my Accessport cable?
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05-09-2010, 11:26 AM | #8 |
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Bump for the morning!
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05-09-2010, 02:07 PM | #9 |
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Location: One Big Ass Mistake America
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did you just finish the swap and are running into these problems?
What ecu are you using? What version AP do you have? Im assuming you converted to drive-by-wire? |
05-09-2010, 03:54 PM | #10 | |
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Quote:
could it be a sensor failing but not throwing a code? I would assume it should throw a code if it were. |
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05-09-2010, 08:12 PM | #11 |
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well i tried unplugging the front 02 sensor and it didnt change anything... could an 02 sensor make everything mess up this bad?
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05-09-2010, 11:21 PM | #12 |
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You should never unplug the front O2 sensor, it is critical to fueling. However, a bad o2 will or could lead to the problems you are describing. Is the front o2 from an ej257? Is your AP for a 2004 Sti?
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05-09-2010, 11:35 PM | #13 |
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I unplugged it to see if anything changed.. im not running the car without it. I know its critical. I would assume its for an ej257 , it was on the motor when i received it. So theres a good chance it could be bad..
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05-10-2010, 01:03 AM | #14 |
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anyone think it could be the front 02?
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05-10-2010, 01:20 AM | #15 |
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Location: CHITOWN
Vehicle:06 STI |
could be, check for compression as well. also.. i'm not sure but check maf as well..
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05-10-2010, 01:27 AM | #16 |
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Checked compression, changed maf's... no difference..
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05-10-2010, 04:55 PM | #17 |
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Location: Mission Viejo, CA
Vehicle:2008 WRX STi White |
EDIT: re-read OP, saw ur not making boost. i/c hosing leak possibly?
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05-10-2010, 05:12 PM | #18 |
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Don't think so, ill double check it tho. It would have to be a massive leak for it to not idle at all...
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05-10-2010, 05:14 PM | #19 |
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Chapter/Region:
NWIC
Vehicle:2005 WRX STi Obsidian Black |
Maybe it's the IAC. If it's faulty it's possible it could cause a rich condition.
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05-10-2010, 05:38 PM | #20 |
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Location: Akron, OH
Vehicle:05 STi Aspen White |
Is this a new setup or have you been running the STi swap for awhile?
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05-10-2010, 06:32 PM | #21 |
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05-10-2010, 06:59 PM | #22 |
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New setup, stock sti swap in 02 wrx. Everything has gone so easy until this point... just dealing with bugs I guess... I knew it would happen but this sux haha thanks so much for all you help thus far everyone!
Since nothing changed when I unplugged the o2 sensor, u think its bad?? |
05-10-2010, 08:11 PM | #23 |
Scooby Specialist
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Join Date: Mar 2007
Chapter/Region:
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Location: Mission Viejo, CA
Vehicle:2008 WRX STi White |
can you hear the turbo spooling when its not making boost?
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05-10-2010, 09:17 PM | #24 |
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yup,sounds like the turbo is fine. I've tried 2 different vf39's n it didn't change.
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05-11-2010, 11:13 PM | #25 |
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still havent had a chance to switch out the o2 sensor yet... anyone think im wasting my time with that??
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