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Old 06-01-2010, 08:09 AM   #1
wil06STI
Scooby Specialist
 
Member#: 153228
Join Date: Jul 2007
Chapter/Region: NESIC
Location: Springfield,MA
Vehicle:
02 WRX Fully Built
Sedona Red

Default Help with Cylinder Roughness!!!!

Car: 06 sti
Injectors: PE 850cc

I was having cold startup issues during the winter months and i tought it was due to colder plugs. I reaplced the colder plugs with stock heat range plugs and the issue didn't go away. I then replce the coil pack in cylinder 1 since it was showing roughness (miss fire) at cold start up and even after it warmed up but only at idle but the miss fire didn't go away. I then swap injectors 1 and 2 hoping it was an injector issue in cylinder 1 and it was going to show up now in cylinder 2 but it didn't. Cylinder 1 still has miss fire issues at idle. I did a compression check when i replaced the colder plugs and all cylinders were within 1 or 2 psi from each other. I can feel the missfire now at idle almost 100% of the time. I've logged the roughness while cruising and it stays at 0 for all cylinders.

What can cause missfires at idle?
What else can i do to trouble shoot this issue?

Any input is greatly appreciatted.


Thanks,

Wil
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Old 06-01-2010, 12:47 PM   #2
romanlynch
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Member#: 126684
Join Date: Sep 2006
Chapter/Region: MWSOC
Location: Lima, OH
Vehicle:
02 wrx
PLATINUM silver baby

Default

what other mods do u have? are there any vacuum leaks? is the cel on?
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Old 06-01-2010, 01:09 PM   #3
wil06STI
Scooby Specialist
 
Member#: 153228
Join Date: Jul 2007
Chapter/Region: NESIC
Location: Springfield,MA
Vehicle:
02 WRX Fully Built
Sedona Red

Default

There are no vacuum leaks and the cell is on but not for a missfire for a sensor i deleted.

I just did a compression test on that cylinder and it has 110 psi. I think that explains the missfire at idle or not?
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Old 06-01-2010, 01:17 PM   #4
renosubby
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Member#: 152576
Join Date: Jun 2007
Chapter/Region: SWIC
Location: Reno, NV
Vehicle:
2009 GTR 10.7@ 133
Mayhem Tuning!!!!!

Default

need to scale injectors/maf or look for leaks!
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Old 06-01-2010, 09:23 PM   #5
wil06STI
Scooby Specialist
 
Member#: 153228
Join Date: Jul 2007
Chapter/Region: NESIC
Location: Springfield,MA
Vehicle:
02 WRX Fully Built
Sedona Red

Default Update!

Engine blew on my way back from work. Rod #1 went through the block. Let see if i can find the culprit after i take it apart.

Wil
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