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10-06-2012, 07:05 PM | #1 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
Location: Milwaukee, WI
Vehicle:2002 WRX Wagon PSM |
2002 Wrx Wagon Misfires - Help!!
I have a 02 WRX wagon with about 115k on it that has been getting random misfires on all cylinders. Here is a list of mods:
VF22 Turbo Walbro 255 fuel pump Perrin short ram intake Grimmspeed boost controller Light weight flywheel MRT Downpipe MRT Cat Back Exhaust I am still in contact with the original owner and he never had issues with random misfires, even with the light flywheel. Here is a list of things I have tried: Cleaned maf Replaced fuel filter New plugs: ngk pfr6g gapped at 028 Compression test @ 150 psi per cylinder Cleaned crank sensor Good fuel pressure No vacuum leaks New pcv Double checked all clips to coil packs All grounds are good and clean Replaced coil packs Seafoamed Top End This all started when I decided to do a tune up and replace the plugs. I have tried ngk irridum plugs with no luck also. The car runs fine with no bouncing idle and no noticeable misfire at idle or driving. I am running out of ideas and I am looking for ANY other advice! Thanks!
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10-06-2012, 07:07 PM | #2 |
Scooby Specialist
Member#: 271720
Join Date: Jan 2011
Chapter/Region:
Tri-State
Location: NEPA
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try resetting the ecu?
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10-06-2012, 07:26 PM | #3 |
Scooby Specialist
Member#: 181298
Join Date: May 2008
Chapter/Region:
MAIC
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Vehicle:2019 KUV 21 Crystal White |
Which injectors u running? And plugs should be gallery 030 not 028
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10-06-2012, 07:31 PM | #4 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
Location: Milwaukee, WI
Vehicle:2002 WRX Wagon PSM |
I have reset the ecu multiple times. Stock injectors. Running out of ideas now!
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10-06-2012, 08:18 PM | #5 |
Scooby Specialist
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Join Date: May 2008
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MAIC
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Vehicle:2019 KUV 21 Crystal White |
Light weight flywheel is my guess
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10-06-2012, 08:22 PM | #6 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
Location: Milwaukee, WI
Vehicle:2002 WRX Wagon PSM |
It almost feels like the car has a slight misfire while sitting at idle...this is odd. After speaking with the previous owner he swears that the car had no misfire issues after he had the lightweight flywheel installed. He said he had it for 20k with no issues. All this started to happen after I decided to do the plugs
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10-06-2012, 08:23 PM | #7 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
Location: Milwaukee, WI
Vehicle:2002 WRX Wagon PSM |
Would having a walbro 255 fuel pump on the stock fuel system have anything to do with this?
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10-06-2012, 08:24 PM | #8 |
Scooby Guru
Member#: 70395
Join Date: Sep 2004
Chapter/Region:
MAIC
Location: Da-boonies,Va
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Search............there are thousands of threads on misfires.
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10-06-2012, 08:25 PM | #9 |
Scooby Guru
Member#: 70395
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Chapter/Region:
MAIC
Location: Da-boonies,Va
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10-06-2012, 08:33 PM | #10 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
Location: Milwaukee, WI
Vehicle:2002 WRX Wagon PSM |
Oh I have been doing searches and so far all of that stuff checks out.
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10-12-2012, 06:10 PM | #11 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
Location: Milwaukee, WI
Vehicle:2002 WRX Wagon PSM |
Cleaned out the iacv and still got misfires! Uggg
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10-12-2012, 06:11 PM | #12 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
Location: Milwaukee, WI
Vehicle:2002 WRX Wagon PSM |
Scratches head
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10-13-2012, 10:24 PM | #13 |
Scooby Newbie
Member#: 334420
Join Date: Oct 2012
Vehicle:02 Wrx Blue |
Same problem with flywheel and light pulley. Runs fine but I keep getting code.
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11-02-2012, 11:05 PM | #14 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
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Vehicle:2002 WRX Wagon PSM |
So I replaced the Crank Position Sensor and so far no more misfires. (Fingers crossed)!! When pulling the old one it looked ok but just replaced it anyway. Is there a way to test these? Its a magnet...how can it go bad lol?
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11-03-2012, 06:21 PM | #15 |
Scooby Specialist
Member#: 219571
Join Date: Aug 2009
Location: kalona, IOWA!
Vehicle:'02 wrx wagon 294k+ '95 SVX ebony mica |
Did you ever pull the codes and see what the computer was telling you? If it was setting codes, it would save you a lot of troubleshooting time, as well as money on random parts.
Typically when you have a random misfire on all cylinders its either a MAF, or a bad crank sensor. '02's don't seem to have many problems with light flywheels and crank pulleys (mine has both and has never given me trouble) becaues their computers were simply not fast enough to process if there was a problem like that. So, my guess would be crank sensor or MAF, based on what you say. But pull the codes and find out for sure. If you don't have a scanner, stop by your local autozone, they do it for free. |
11-03-2012, 06:24 PM | #16 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
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MWSOC
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Vehicle:2002 WRX Wagon PSM |
Yes I have pulled the codes. Got all random misfires P0301, P0302, P0303, P0304...all in random patterns and never all on at the same time.
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11-03-2012, 07:24 PM | #17 |
Scooby Specialist
Member#: 219571
Join Date: Aug 2009
Location: kalona, IOWA!
Vehicle:'02 wrx wagon 294k+ '95 SVX ebony mica |
Well, it sounds like you may have gotten it with the crank sensor. So... awesome!
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11-03-2012, 07:41 PM | #18 |
Scooby Newbie
Member#: 321043
Join Date: May 2012
Chapter/Region:
MWSOC
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Vehicle:2002 WRX Wagon PSM |
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