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Old 09-27-2012, 10:46 AM   #1
fendrick
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Member#: 254744
Join Date: Aug 2010
Location: New York
Vehicle:
2002 WRX
Silver

Default Cylinder misfires on all four

The other day I was driving in the rain, Went to go WOT and it threw a code. I recently had the car tuned. I pulled the plugs and checked the coil packs. Plugs were destroyed, car is running very rich. Pulled the plugs installed new ones, Happened again, i smoke tested the car and found no leaks. I datalogged the car from my aem air/fuel and the car was hitting as low as 10 (as low as it can be read) for cycles of 600 rpms. and it would bounce all over the place under WOT. My tuner said that his gauge reads more accurate than mine which is why it runs so rich on my datalog. Let me know if there is anything else that would help diagnose this problem. Want to get this fixed!!!!!
The following mods are:
Motor was just rebuilt 3,000 miles ago. Put down 299 awhp 265 torque
.20 over JE Pistons
Eagle Rods
18g Blouch journal bearing turbo
750cc deaschwerks fuel injectors
255 walbro
TurboXS Front Mount Intercooler
Perrin Short Ram Air Intake
Greddy turboback exhaust
Prosport Equal Length Header
Gimmick Boost Control Solonoid
STI oil pan
STI oil baffle
STI oil pick up
Brand new oem clutch
Defi red racer boost gauge
AEM oil pressure gauge
AEM air/fuel ratio gauge
ATI gauge pod
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Old 09-27-2012, 02:31 PM   #2
wgr73
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Join Date: Dec 2009
Chapter/Region: SWIC
Location: Las Cruces, El Paso
Vehicle:
2008 STi (OBP)
CAMTuning.com

Default

Quote:
Originally Posted by fendrick View Post
The other day I was driving in the rain, Went to go WOT and it threw a code. I recently had the car tuned. I pulled the plugs and checked the coil packs. Plugs were destroyed, car is running very rich. Pulled the plugs installed new ones, Happened again, i smoke tested the car and found no leaks. I datalogged the car from my aem air/fuel and the car was hitting as low as 10 (as low as it can be read) for cycles of 600 rpms. and it would bounce all over the place under WOT. My tuner said that his gauge reads more accurate than mine which is why it runs so rich on my datalog. Let me know if there is anything else that would help diagnose this problem. Want to get this fixed!!!!!
The following mods are:
Motor was just rebuilt 3,000 miles ago. Put down 299 awhp 265 torque
.20 over JE Pistons
Eagle Rods
18g Blouch journal bearing turbo
750cc deaschwerks fuel injectors
255 walbro
TurboXS Front Mount Intercooler
Perrin Short Ram Air Intake
Greddy turboback exhaust
Prosport Equal Length Header
Gimmick Boost Control Solonoid
STI oil pan
STI oil baffle
STI oil pick up
Brand new oem clutch
Defi red racer boost gauge
AEM oil pressure gauge
AEM air/fuel ratio gauge
ATI gauge pod

Your tuner said his gauge reads more accurate than yours? Possibly, but your afr shouldn't be that low. It sounds like it's even going lower than 10 but your afr gauge can't read that low. Take it back to him asap.

When you mentioned all 4-cyl misfire and rain in the same sentence, I immediately thought you sucked up water but this sounds to me like a fueling issue or a major leak. Can you build boost?
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Old 09-27-2012, 02:43 PM   #3
fendrick
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Member#: 254744
Join Date: Aug 2010
Location: New York
Vehicle:
2002 WRX
Silver

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I can't find a leak anywhere I had it up on a lift and scoped the whole car out. MAF sensor is fine. I thought it seemed odd that he said with it dropping to 10 that that is fine?
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Old 09-28-2012, 07:46 AM   #4
quazimoto
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Location: Da-boonies,Va
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And the code is?
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Old 09-28-2012, 05:01 PM   #5
fendrick
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Location: New York
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2002 WRX
Silver

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P0301 302 303 304
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Old 09-29-2012, 01:08 PM   #6
Phatron
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Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
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CEO PhatBottiTuning
2006 STi GTX3582 + Meth

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rain can mess up the MAF which will mess up the fueling. does it only happen in the rain?
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Old 09-29-2012, 01:22 PM   #7
fendrick
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2002 WRX
Silver

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Nope i cleared the codes and they come right back
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Old 09-29-2012, 01:25 PM   #8
Phatron
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Member#: 36033
Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
Vehicle:
CEO PhatBottiTuning
2006 STi GTX3582 + Meth

Default

did you check the spark plug gap before install? even if they are "pre-gapped" you still need to check them.

and it is also possibly that the car was tuned with a leak....and now you dont have a leak.
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Old 09-29-2012, 01:31 PM   #9
fendrick
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Location: New York
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2002 WRX
Silver

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Yes I checked the gap on the plugs and it was perfectly fine
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Old 09-29-2012, 02:13 PM   #10
Phatron
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Chapter/Region: SCIC
Location: Tuning Lab
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CEO PhatBottiTuning
2006 STi GTX3582 + Meth

Default

You're basically just gonna have to troubleshoot through the fueling and ignition system until u find something then.
I'd start with rechecking the tune, swap injectors, swap maf sensors, swap front 02, check fuel pressure, fuel pump
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Old 09-29-2012, 02:22 PM   #11
fendrick
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2002 WRX
Silver

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Thanks! Ill start there I really appreciate the help!
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Old 09-29-2012, 02:46 PM   #12
Phatron
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Join Date: Apr 2003
Chapter/Region: SCIC
Location: Tuning Lab
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CEO PhatBottiTuning
2006 STi GTX3582 + Meth

Default

if you've never done the front 02 sensor, then i would start there.
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Old 09-29-2012, 03:03 PM   #13
fendrick
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Silver

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Sounds good! Thanks!!! Ill keep my post updated
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Old 11-06-2012, 07:32 AM   #14
fendrick
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2002 WRX
Silver

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I got the problem resolved. I changed plugs, swapped coil packs around and resealed the injectors and all is good now!
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