07 avalanche p0302 code driving me nuts...

[no1udknow]

hey guys, i bought a 07 avalanche, 5.3L 2wd. it has a p0302 code and I cant seem to get it to go away.

what I've done so far...
Plugs
Wires
Coils
Injectors
Smoke test (found a broken pcv pipe on the drivers rear of engine...repaired)

it does have a little miss at idle, my next recourse will be compression test on the cylinders and look at the cats.

I pulled live data today with my scanner but don't see anything here is a readout sample, tell me if you see anything in the data.
Thanks in advance!

CRUISING AT 60MPH
Numbers of DTCs 0
Fuel system 1 statusCL
Fuel System 2 statusCL
Calculated Load Value(%)60.0
Engine Coolant Temperature(¡£F)197
Short Term Fuel Trim -Bank 1(%)-7.0
Long Term Fuel Trim - Bank 1(%)0.0
Short Term Fuel Trim -Bank 2(%)0.0
Long Term Fuel Trim - Bank 2(%)-0.8
Intake Manifold Absolute Pressure(psi)10.0
Engine RPM(rpm) 1786
Vehicle Speed Sensor(mph)61
Ignition Timing Advanece for #1 Cylinder(¡£)27.0
Intake Air Temperature(¡£F)93
Air Flow Rate from Mass Air Flow Sensor(lb/s)0.09
Absolute Throttle Position(%)37.3
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.200
Short Term Fuel Trim Bank 1-Sensor 1(%)1.6
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.600
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.480
Short Term Fuel Trim Bank 2-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.560
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBD&OBDII
Time Since Engine Start(sec)3951
Distance Travelled While MIL is Activated(miles)0
Commanded Evaporative Purge(%)93.3
Fuel Level Input(%)14.5
Number of warm-ups since diagnostic trouble codes cleared0
Distance since diagnostic trouble codes cleared(miles)1
Evap System Vapor Pressure(inH2o)-4.336
Barometric Pressure(psi)14.8
Catalyst Temperature Bank 1,Sensor 1(¡£F)1385
Catalyst Temperature Bank 2,Sensor 1(¡£F)1673
Control module voltage(V)13.497
Absolute Load Value(%)41.6
Commanded Equivalence Ratio0.999
Relative Throttle Position(%)23.5
Ambient air temperature(¡£F)89
Absolute Throttle Position B(%)36.5
Accelerator Pedal Position D(%)28.6
Accelerator Pedal Position E(%)14.1
Commanded Throttle Actuator Control(%)33.7
Alcohol Fuel Percentage(%)3.1
IDLING IN THE DRIVEWAY GETS CODE
Live Data
Numbers of DTCs 1
Fuel system 1 statusOL-Fault
Fuel System 2 statusOL-Fault
Calculated Load Value(%)18.0
Engine Coolant Temperature(¡£F)195
Short Term Fuel Trim -Bank 1(%)0.0
Long Term Fuel Trim - Bank 1(%)0.0
Short Term Fuel Trim -Bank 2(%)0.0
Long Term Fuel Trim - Bank 2(%)-0.8
Intake Manifold Absolute Pressure(psi)5.1
Engine RPM(rpm) 599
Vehicle Speed Sensor(mph)0
Ignition Timing Advanece for #1 Cylinder(¡£)15.0
Intake Air Temperature(¡£F)116
Air Flow Rate from Mass Air Flow Sensor(lb/s)0.01
Absolute Throttle Position(%)21.6
Location of Oxygen SensorsB1S12--B2S12--
Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.810
Short Term Fuel Trim Bank 1-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 1-Sensor 2(V)0.675
Short Term Fuel Trim Bank 1-Sensor 2(%)N/A
Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.715
Short Term Fuel Trim Bank 2-Sensor 1(%)0.0
Oxygen Sensor Output Voltage Bank 2-Sensor 2(V)0.925
Short Term Fuel Trim Bank 2-Sensor 2(%)99.2
OBD requirements to which vehicle is designedOBD&OBDII
Time Since Engine Start(sec)100
Distance Travelled While MIL is Activated(miles)0
Commanded Evaporative Purge(%)0.0
Fuel Level Input(%)13.7
Number of warm-ups since diagnostic trouble codes cleared0
Distance since diagnostic trouble codes cleared(miles)5
Evap System Vapor Pressure(inH2o)0.018
Barometric Pressure(psi)14.6
Catalyst Temperature Bank 1,Sensor 1(¡£F)897
Catalyst Temperature Bank 2,Sensor 1(¡£F)890
Control module voltage(V)13.571
Absolute Load Value(%)17.6
Commanded Equivalence Ratio0.909
Relative Throttle Position(%)8.6
Ambient air temperature(¡£F)104
Absolute Throttle Position B(%)21.6
Accelerator Pedal Position D(%)18.8
Accelerator Pedal Position E(%)9.4
Commanded Throttle Actuator Control(%)12.2
Alcohol Fuel Percentage(%)3.1

[EVRLET]

With the data provided, was the idle data after you drove it and came back to the house? You have an fuel open loop (OL) fault. Now if you do a cold start, it will be in open loop until it warms up. No problems there. However, if you go from open loop to closed loop and back to open loop, and you have a continuous misfire, the PCM is saying it’s having a hard time trying to control fuel and spark so it goes into open loop fault. You have to get to the bottom of this misfire.

Many times it’s a spark issues, but not always. Since you replaced the coil and plugs, double check the connectors and loose wires at the connector. Also check the fuel injector clip and make sure it’s actually seated on the injector. Loose connectors will affect injector operation. This is a cylinder #2 issue so concentrate there. From the looks of it, this is an intermittent issue and will take some patience to find the fault. But the good news is that you know it’s cylinder #2.

I honestly don’t think it’s a cat issue because it would be more of a p0300 code and not specific to a cylinder.

[no1udknow]

Originally Posted by EVRLET

With the data provided, was the idle data after you drove it and came back to the house? You have an fuel open loop (OL) fault. Now if you do a cold start, it will be in open loop until it warms up. No problems there. However, if you go from open loop to closed loop and back to open loop, and you have a continuous misfire, the PCM is saying it’s having a hard time trying to control fuel and spark so it goes into open loop fault. You have to get to the bottom of this misfire.

Many times it’s a spark issues, but not always. Since you replaced the coil and plugs, double check the connectors and loose wires at the connector. Also check the fuel injector clip and make sure it’s actually seated on the injector. Loose connectors will affect injector operation. This is a cylinder #2 issue so concentrate there. From the looks of it, this is an intermittent issue and will take some patience to find the fault. But the good news is that you know it’s cylinder #2.

I honestly don’t think it’s a cat issue because it would be more of a p0300 code and not specific to a cylinder.

Yes the second set of data was "DTC triggered" so it only started recording after the fault occurred.

[mikelom]

Have you tried doing a compression test?

[no1udknow]

Originally Posted by mikelom

Have you tried doing a compression test?

Sorry it's been a minute..... no doing a compression test this weekend. Someone suggested a cam phaser? Something about variable valve timing. This avalanche does have the cylinder drop out for eco mode.

[no1udknow]

Ok, so did a compression test.
#1) 175 psi. #2) 165 psi
#3) 180 psi. #4) 185 psi
#5) 185 psi. #6) 190 psi
#7) 180 psi. #8) 180 psi

So clearly #2 is low, where should I look? Valves? Rings?
I'm screwed, I need to get this thing transferred into my name and it's not gonna pass smog.

[heartattack]

You can squirt a small amount of oil in #2 cylinder with the spark plug removed. Spin the engine over and see if your compression shows a increase. if it does, then its most likely ring related.

I would guess its carboned rings. If so, buy the GM top end cleaner, pour some in each cylinder and let sit overnight. spin the engine over the next day with the spark plugs out to clear the fluid. Install the spark plugs and go drive the truck to clear out the residue.

[no1udknow]

Originally Posted by heartattack

You can squirt a small amount of oil in #2 cylinder with the spark plug removed. Spin the engine over and see if your compression shows a increase. if it does, then its most likely ring related.

I would guess its carboned rings. If so, buy the GM top end cleaner, pour some in each cylinder and let sit overnight. spin the engine over the next day with the spark plugs out to clear the fluid. Install the spark plugs and go drive the truck to clear out the residue.

Thanks, I will give that a try.