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Old 04-03-2009, 12:13 AM   #1
Scooby Specialist
Member#: 51684
Join Date: Jan 2004
Location: CO
Default Cylinder Roughness (Misfire) Prior to Being Broken In?

I just got my built 04 STI running and did some datalogging while I worked on a good basemap for it. In datalogging, I turned on cylinder roughness in all 4 cylinders and it picked up counts in all 4 cylinders. The datalogger is Romraider. Is this normal since the motor has yet to be broken in?

Here's a list of my motor mods:

Wiseco pistons
Helix rods
BC valve springs and retainers
Cometic head gasket
BC 272 cams
Exedy twin disc clutch
modded 07 STI injectors (1000cc)
topfeed TGVs
Agency Power fuel rails
Aeromotive FPR (38psi)
Gruppe-S equal length header
Perrin GT3076R turbo kit
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Old 04-03-2009, 10:37 AM   #2
Citizen Mick
Member#: 27646
Join Date: Oct 2002
Chapter/Region: NWIC
Location: Portland, Oregon
2003 Sleeved 2.5
Oil Dry Sump Goodness


I've seen it in a broken in engine which was perfectly fine. I've also used it in the past to diagnose broken ringlands which is not the case with you. I would bet it's just picking up piston slap
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Old 04-03-2009, 12:48 PM   #3
Scooby Specialist
Member#: 60142
Join Date: Apr 2004
Location: Bend, OR
2011 WRX


So you think piston slap might cause this? I didn't realize that cold slap would have that much influence on the crank sensor, but with the slugs initially wobbling around I guess that makes some sense...
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