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Old 03-09-2005, 09:56 AM   #1
rjp
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Member#: 72778
Join Date: Oct 2004
Chapter/Region: NESIC
Location: Franklin, MA
Vehicle:
2009 WRX 5dr DGM
OHHI

Default Blinking CEL and OBD-II "NOT READY"

so, I posted this in my local forum, but I'm going to repost here (this was the best I could think of out of all the forums).

I went in for inspection yesterday and failed. I had a few NOT READY codes.
Catalytic Converters
Evaporative System
Oxygen Sensors

The car is a 2001 RS. It's got some mods:
ProECM Chip (some think this is the culprit)
Intake
Clutch/Flywheel
Suspension, etc.

Just bought the car three weeks ago (with the mods), and it previously had a set of MRT headers and high-flow cat, and a Brullen cat-back. The stock system was swapped back in before we took the car.

So, on the advice of some, I tried resetting the ECU last night. On the 13 mile drive to school (which was shortcutted into a trip to autozone) the CEL would blink a few times then go away. One of the guys at AZ said that on Fords the CEL will blink whenever there's a misfire, but I'm not too sure that's what's happening. I didn't feel any hesitation and it was blinking on the highway.

My eventual plans will probably include removing the chip, but I want to leave it in for now because it's REALLY cold outside. I have 60 days with the Type "R" rejection inspection sticker, so there isn't really any rush. I'm going to go get it re-scanned after about a week.

Also, if the mods think this belongs somewhere else, don't hesitate to move me.
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Old 03-09-2005, 10:31 AM   #2
Jon [in CT]
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I agree that the ProECM chip is the culprint. The main thing it does is to alter the signal from the engine coolant temperature (ECT) sensor so the ECU always thinks the engine is cold. That alters the ECU's fuel and spark strategy. But many of the OBD checks the ECU does are only performed after the ECU determines the engine is at operating temperature. Hence, the "NOTREADY" problems.

I'd throw that ProECM chip away - it'd be unethical to sell it to some rube.
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Old 03-09-2005, 11:24 AM   #3
rjp
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2009 WRX 5dr DGM
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Yeah, I was reading old threads about it. I might see if I can open it up and then revive those threads. No one who bought one wanted to risk opening it and destroying it, but if I pull it out, meh. I could always give it back to Keith. Previous owner sold all the stuff we had to have pulled off (exhaust system), so he might appreciate it, but on the other hand, I could use the money to buy other parts (or the paint for getting the bumpers repainted).

Moral dilemma. Now I need to schedule with mumbles for getting it out.
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Old 03-09-2005, 11:46 AM   #4
Mulder
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The flashing CEL indicates a misfire on any OBDII car. The misfire detection is sensitive enough that you may not feel anything unusual when the light is flashing.
Lightened flywheels can also cause false misfire readings, although usually just in the form of hard cylinder misfire codes rather than a flashing CEL, and this is more of an issue on the WRX than the RS.
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Old 03-09-2005, 12:00 PM   #5
rjp
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2009 WRX 5dr DGM
OHHI

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I never had any misfires before resetting the ECU today. I think it's probably a combination of the cold weather, chip, and fresh unlearned ECU.
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