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Old 08-09-2006, 02:53 PM   #1
Scooby Newbie
Member#: 32858
Join Date: Feb 2003
Chapter/Region: E. Canada

Default STG2: Flashing CEL but no CEL code

Hi Guys,

This morning on the way to work I had the CEL flashing after some spirited driving. After I eased off to a more commuter style pace the CEL stoped flashing and went away. When I arrived to work I checked for CEL codes and the Accessport reported that there were none, what gives, were these CELs the ones that the STAGE 2 clears?

BTW, I have a STAGE 2 with PDE uppipe, PDE downpipe and a full turbo back exhaust from BPM.


Ottawa Canada
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Old 08-10-2006, 10:43 PM   #2
Scooby Newbie
Member#: 882
Join Date: Feb 2000
Location: Michigan
2004 WRX Wagon
very blue


Flashing MIL usually means that the ECU thinks it's detecting misfire. Specifically, it thinks it's seeing enough misfire to damage the catalyst. There have been several cases on scoobys where the combination of a lightweight flywheel and lightweight/underdrive pulley has caused a false misfire MIL. (basically, the ECU monitors the crankshaft signal to detect misfire. Lighter reciprocating mass will cause more variation in the crank signature for a "good" system, but the ECU can falsely detect this as misfire.) I'm not sure which codes the AP explicitly turns off (check the map notes for the map you're running) -- looking at the notes for the stage1/2 maps, I don't see the misfire codes disabled (P0300-P0304)....
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