|04-03-2009, 01:13 AM||#1|
Join Date: Jan 2004
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:
BC valve springs and retainers
Cometic head gasket
BC 272 cams
Exedy twin disc clutch
modded 07 STI injectors (1000cc)
Agency Power fuel rails
Aeromotive FPR (38psi)
Gruppe-S equal length header
Perrin GT3076R turbo kit
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|04-03-2009, 11:37 AM||#2|
Join Date: Oct 2002
Location: Portland, OregonVehicle:
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
|04-03-2009, 01:48 PM||#3|
Join Date: Apr 2004
Location: Bend, ORVehicle:
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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