For reference:
P0103 - Mass Air Flow (MAF) Circuit High Input
Relevant Mods:
CP-E 3" cat-back
CP-E 3" CAI
HKS SSQV BOV
GReddy PRofec B-Spec II EBC
Story:
Ambients around 50 F, rain, night. EBC set to 39% / 13# gain, usually good for around 16.5 - 17# boost. Pulling hard away from a light, ran the engine up to about 6200 in 2nd gear. I hit fuel cut, which has happened several times, but it seemed to cut especially hard and threw the CEL, no flash. Immediately backed down to granny-mode driving and pulled off, killed the engine for about 2 minutes, refired. CEL persisted. Rinse and repeat, still it's on.
It's not flashing so I'm thinking it's ok to drive, took it about 20 - 25 miles to a friend's house and parked it for about an hour. Drove for about 2 miles, all low-speed residential neighborhood, light stays on. Parked for about an hour and a half, refired the engine, and the light was off.
Got my scan tool today and had 1 stored code, P0103 (link above). Code describes a MAF sensor high voltage. My limited experience with sensors is that they use very clever materials that generate signal voltages based on conditions, then a computer interprets those voltages (or currents, depends on the sensor) and compares against a pre-set calibration to derive values describing the conditions observed by the sensor. I suspect that the EBC running boost above the stock boost levels at high rev caused more air to be coming through the intake than the car expected. It's still trying to control boost via the stock WG solenoid, but it's disconnected, so there's a mismatch between the manifold air pressure observed and the amount of air transversing the MAF sensor. ECU says "where the hell is all this air going??" and throws the code.
I cleared the code (RPM ScanGauge II GB FTW) and expect no further problems (unless I drive like a jackass again).
Comments? Has anyone else specifically seen P0103? This is a generic OBDII code and should apply to all OBDII vehicles, not just turbos or the MS6 in particular.
P0103 - Mass Air Flow (MAF) Circuit High Input
Relevant Mods:
CP-E 3" cat-back
CP-E 3" CAI
HKS SSQV BOV
GReddy PRofec B-Spec II EBC
Story:
Ambients around 50 F, rain, night. EBC set to 39% / 13# gain, usually good for around 16.5 - 17# boost. Pulling hard away from a light, ran the engine up to about 6200 in 2nd gear. I hit fuel cut, which has happened several times, but it seemed to cut especially hard and threw the CEL, no flash. Immediately backed down to granny-mode driving and pulled off, killed the engine for about 2 minutes, refired. CEL persisted. Rinse and repeat, still it's on.
It's not flashing so I'm thinking it's ok to drive, took it about 20 - 25 miles to a friend's house and parked it for about an hour. Drove for about 2 miles, all low-speed residential neighborhood, light stays on. Parked for about an hour and a half, refired the engine, and the light was off.
Got my scan tool today and had 1 stored code, P0103 (link above). Code describes a MAF sensor high voltage. My limited experience with sensors is that they use very clever materials that generate signal voltages based on conditions, then a computer interprets those voltages (or currents, depends on the sensor) and compares against a pre-set calibration to derive values describing the conditions observed by the sensor. I suspect that the EBC running boost above the stock boost levels at high rev caused more air to be coming through the intake than the car expected. It's still trying to control boost via the stock WG solenoid, but it's disconnected, so there's a mismatch between the manifold air pressure observed and the amount of air transversing the MAF sensor. ECU says "where the hell is all this air going??" and throws the code.
I cleared the code (RPM ScanGauge II GB FTW) and expect no further problems (unless I drive like a jackass again).
Comments? Has anyone else specifically seen P0103? This is a generic OBDII code and should apply to all OBDII vehicles, not just turbos or the MS6 in particular.