C5 Mass Air Flow problem
Thread Starter
3rd Gear
Joined: Mar 2014
Posts: 3
Likes: 0
From: Cairo
C5 Mass Air Flow problem
Hey there people, I am facing a problem with my C5 corvette .....
the Car's check engine lamp keeps going on the instrument cluster and when i put it into diagnostics (both by tech II and through car's own instrument panel) I get the infamous P0101 trouble code ..... so I replaced the mass air flow sensor with a brand new one and still the problem presists ...... and not only does the car's performance decreases at certain moments but it even sometimes when I push the gas pedal at speeds of above 30 miles I feel that I am pushing nothing ..... the car doesn't respond or accelerate.......
please help me ...... I don't know what to clean or replace ?
the Car's check engine lamp keeps going on the instrument cluster and when i put it into diagnostics (both by tech II and through car's own instrument panel) I get the infamous P0101 trouble code ..... so I replaced the mass air flow sensor with a brand new one and still the problem presists ...... and not only does the car's performance decreases at certain moments but it even sometimes when I push the gas pedal at speeds of above 30 miles I feel that I am pushing nothing ..... the car doesn't respond or accelerate.......
please help me ...... I don't know what to clean or replace ?
Drifting
Joined: Sep 2009
Posts: 1,719
Likes: 4
From: cinnaminson n.j.
St. Jude Donor '14
Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:
The secondary ignition wires or coils
Any solenoids
Any relays
Any motors
A low minimum air rate through the sensor bore at idle or during deceleration may cause this DTC to set. Inspect for the following conditions:
Any deposits on the throttle plate or in the throttle bore
Any vacuum leak downstream of the MAF sensor
Inspect for any contamination or debris on the sensing elements of the MAF sensor.
Inspect the air induction system for any water intrusion. Any water that reaches the MAF sensor will skew the sensor and may cause this DTC to set.
Inspect the secondary air injection system (AIR) for any water intrusion.
A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 7-12 g/s at idle to 200 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
Inspect for a skewed or stuck ECT sensor.
A high resistance of 15 ohms or more on the ignition 1 voltage circuit may cause the DTC to set. A high resistance may cause a driveability concern before this DTC sets.
The barometric pressure that is used to calculate the predicted mass air flow value is initially based on the MAP sensor at key ON. When the engine is running the MAP sensor value is continually updated near wide open throttle. A skewed MAP sensor will cause the calculated mass air flow value to be inaccurate and may result in a no start condition. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 101 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
A high resistance on the low reference circuit of the MAP sensor may cause this DTC to set.
If the condition is intermittent, refer to Intermittent Conditions. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Strategies
The secondary ignition wires or coils
Any solenoids
Any relays
Any motors
A low minimum air rate through the sensor bore at idle or during deceleration may cause this DTC to set. Inspect for the following conditions:
Any deposits on the throttle plate or in the throttle bore
Any vacuum leak downstream of the MAF sensor
Inspect for any contamination or debris on the sensing elements of the MAF sensor.
Inspect the air induction system for any water intrusion. Any water that reaches the MAF sensor will skew the sensor and may cause this DTC to set.
Inspect the secondary air injection system (AIR) for any water intrusion.
A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 7-12 g/s at idle to 200 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
Inspect for a skewed or stuck ECT sensor.
A high resistance of 15 ohms or more on the ignition 1 voltage circuit may cause the DTC to set. A high resistance may cause a driveability concern before this DTC sets.
The barometric pressure that is used to calculate the predicted mass air flow value is initially based on the MAP sensor at key ON. When the engine is running the MAP sensor value is continually updated near wide open throttle. A skewed MAP sensor will cause the calculated mass air flow value to be inaccurate and may result in a no start condition. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 101 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
A high resistance on the low reference circuit of the MAP sensor may cause this DTC to set.
If the condition is intermittent, refer to Intermittent Conditions. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Strategies
Thread Starter
3rd Gear
Joined: Mar 2014
Posts: 3
Likes: 0
From: Cairo
Thanks Marty......
Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:
The secondary ignition wires or coils
Any solenoids
Any relays
Any motors
A low minimum air rate through the sensor bore at idle or during deceleration may cause this DTC to set. Inspect for the following conditions:
Any deposits on the throttle plate or in the throttle bore
Any vacuum leak downstream of the MAF sensor
Inspect for any contamination or debris on the sensing elements of the MAF sensor.
Inspect the air induction system for any water intrusion. Any water that reaches the MAF sensor will skew the sensor and may cause this DTC to set.
Inspect the secondary air injection system (AIR) for any water intrusion.
A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 7-12 g/s at idle to 200 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
Inspect for a skewed or stuck ECT sensor.
A high resistance of 15 ohms or more on the ignition 1 voltage circuit may cause the DTC to set. A high resistance may cause a driveability concern before this DTC sets.
The barometric pressure that is used to calculate the predicted mass air flow value is initially based on the MAP sensor at key ON. When the engine is running the MAP sensor value is continually updated near wide open throttle. A skewed MAP sensor will cause the calculated mass air flow value to be inaccurate and may result in a no start condition. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 101 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
A high resistance on the low reference circuit of the MAP sensor may cause this DTC to set.
If the condition is intermittent, refer to Intermittent Conditions. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Strategies
The secondary ignition wires or coils
Any solenoids
Any relays
Any motors
A low minimum air rate through the sensor bore at idle or during deceleration may cause this DTC to set. Inspect for the following conditions:
Any deposits on the throttle plate or in the throttle bore
Any vacuum leak downstream of the MAF sensor
Inspect for any contamination or debris on the sensing elements of the MAF sensor.
Inspect the air induction system for any water intrusion. Any water that reaches the MAF sensor will skew the sensor and may cause this DTC to set.
Inspect the secondary air injection system (AIR) for any water intrusion.
A wide open throttle acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 7-12 g/s at idle to 200 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
Inspect for a skewed or stuck ECT sensor.
A high resistance of 15 ohms or more on the ignition 1 voltage circuit may cause the DTC to set. A high resistance may cause a driveability concern before this DTC sets.
The barometric pressure that is used to calculate the predicted mass air flow value is initially based on the MAP sensor at key ON. When the engine is running the MAP sensor value is continually updated near wide open throttle. A skewed MAP sensor will cause the calculated mass air flow value to be inaccurate and may result in a no start condition. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 101 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
A high resistance on the low reference circuit of the MAP sensor may cause this DTC to set.
If the condition is intermittent, refer to Intermittent Conditions. See: Powertrain Management\Computers and Control Systems\Testing and Inspection\Initial Inspection and Diagnostic Overview\Diagnostic Strategies
Thanks marty I really appreciate the help ...... it will probably be a few days before I am free to "implement" your advice but I will let you know if there is anything new and if your wondering ....... yes the problem is intermittent
