Need help reading scanner reports

**Luckysan** · 08-21-2024, 04:03 PM

Hi fellows. I don't know if I'm in the right section. I got a '02 Z28 5.7L automatic. I ran a health scan and my problem is that I don't know how to read it since I don't know what the numbers should be for a good running engine. I'm hoping that somebody with the knowledge would tell me if the numbers in my my report are good or bad. Here are the reports...

Report taken at 657.25 RPM

# Of DTCs Stored In This ECU 0
Absolute Throttle Position 0 %
Air Flow Rate From Mass Air Flow Sensor 48.49 lb/h
Calculated Load Value 1.961 %
Commanded Secondary Air Status OFF
Engine Coolant Temperature 217.4 degree F
Engine RPM 657.25 rpm
Fuel System 1 Status CL
Fuel System 2 Status CL
Ignition Timing Advance For #1 Cylinder 16.500 BTDC
Intake Air Temperature 96.8 degree F
Intake Manifold Absolute Pressure 5.25 psi
Location Of Oxygen Sensors B1:S12--B2:12---
Long Term Fuel Trim - Bank 1 -8.594 %
Long Term Fuel Trim - Bank 2 -10.938 %
Malfunction Indicator Lamp (MIL) Status OFF
OBD Requirements To Which
Vehicle Or Engine Is Certified OBD II
Oxygen Sensor Output Voltage B1S1 0.16 V
Oxygen Sensor Output Voltage B1S2 0.12 V

Report taken at 2500 RPM

# Of DTCs Stored In This ECU 0
Absolute Throttle Position 11.765 %
Air Flow Rate From Mass Air Flow Sensor 157.07 lb/h
Calculated Load Value 7.059 %
Commanded Secondary Air Status OFF
Engine Coolant Temperature 231.8 degree F
Engine RPM 2581.75 rpm
Fuel System 1 Status CL
Fuel System 2 Status CL
Ignition Timing Advance For #1 Cylinder 40.500 BTDC
Intake Air Temperature 95 degree F
Intake Manifold Absolute Pressure 3.6 psi
Location Of Oxygen Sensors B1:S12--B2:12---
Long Term Fuel Trim - Bank 1 -10.156 %
Long Term Fuel Trim - Bank 2 -11.719 %
Malfunction Indicator Lamp (MIL) Status OFF
OBD Requirements To Which
Vehicle Or Engine Is Certified OBD II
Oxygen Sensor Output Voltage B1S1 0.8 V
Oxygen Sensor Output Voltage B1S2 0.72 V
Oxygen Sensor Output Voltage B2S1 0.63 V
Oxygen Sensor Output Voltage B2S2 0.7 V
Short Term Fuel Trim - Bank 1 3.906 %
Short Term Fuel Trim - Bank 2 4.688 %
Short Term Fuel Trim B1S1 5.47 %
Short Term Fuel Trim B1S2 %
Short Term Fuel Trim B2S1 0 %
Short Term Fuel Trim B2S2 %
Vehicle Speed Sensor 0 mph

Any help would be highly appreciated. Thank you!

**Whamhammer** · 08-25-2024, 01:57 PM

Originally Posted by Luckysan

Hi fellows. I don't know if I'm in the right section. I got a '02 Z28 5.7L automatic. I ran a health scan and my problem is that I don't know how to read it since I don't know what the numbers should be for a good running engine. I'm hoping that somebody with the knowledge would tell me if the numbers in my my report are good or bad. Here are the reports...

Report taken at 657.25 RPM

# Of DTCs Stored In This ECU 0
Absolute Throttle Position 0 %
Air Flow Rate From Mass Air Flow Sensor 48.49 lb/h
Calculated Load Value 1.961 %
Commanded Secondary Air Status OFF
Engine Coolant Temperature 217.4 degree F
Engine RPM 657.25 rpm
Fuel System 1 Status CL
Fuel System 2 Status CL
Ignition Timing Advance For #1 Cylinder 16.500 BTDC
Intake Air Temperature 96.8 degree F
Intake Manifold Absolute Pressure 5.25 psi
Location Of Oxygen Sensors B1:S12--B2:12---
Long Term Fuel Trim - Bank 1 -8.594 %
Long Term Fuel Trim - Bank 2 -10.938 %
Malfunction Indicator Lamp (MIL) Status OFF
OBD Requirements To Which
Vehicle Or Engine Is Certified OBD II
Oxygen Sensor Output Voltage B1S1 0.16 V
Oxygen Sensor Output Voltage B1S2 0.12 V

Report taken at 2500 RPM

# Of DTCs Stored In This ECU 0
Absolute Throttle Position 11.765 %
Air Flow Rate From Mass Air Flow Sensor 157.07 lb/h
Calculated Load Value 7.059 %
Commanded Secondary Air Status OFF
Engine Coolant Temperature 231.8 degree F
Engine RPM 2581.75 rpm
Fuel System 1 Status CL
Fuel System 2 Status CL
Ignition Timing Advance For #1 Cylinder 40.500 BTDC
Intake Air Temperature 95 degree F
Intake Manifold Absolute Pressure 3.6 psi
Location Of Oxygen Sensors B1:S12--B2:12---
Long Term Fuel Trim - Bank 1 -10.156 %
Long Term Fuel Trim - Bank 2 -11.719 %
Malfunction Indicator Lamp (MIL) Status OFF
OBD Requirements To Which
Vehicle Or Engine Is Certified OBD II
Oxygen Sensor Output Voltage B1S1 0.8 V
Oxygen Sensor Output Voltage B1S2 0.72 V
Oxygen Sensor Output Voltage B2S1 0.63 V
Oxygen Sensor Output Voltage B2S2 0.7 V
Short Term Fuel Trim - Bank 1 3.906 %
Short Term Fuel Trim - Bank 2 4.688 %
Short Term Fuel Trim B1S1 5.47 %
Short Term Fuel Trim B1S2 %
Short Term Fuel Trim B2S1 0 %
Short Term Fuel Trim B2S2 %
Vehicle Speed Sensor 0 mph

Any help would be highly appreciated. Thank you!

Is the Camaro having a problem?

**Luckysan** · 08-25-2024, 05:23 PM

Yes, it's. It has been giving me problems passing California smog test since I first bought it. The engine sounded strong but wouldn't pass the California smog test because the catalyst converter wasn't ready. I drove it for a long while trying to do the drive cycle but then it started to show an 02 sensor error code. I replaced the sensors, then it started to show multiple misfires errors code in bank 2 so I replace the spark plugs but then P0174 code lighted in up bank 2 again. A mechanic brought in a smoke machine and he fixed the leak, then he got the short and long term fuel trim numbers to be in working order. Supposedly the car was ready for the smog test but when I took it out to do the drive cycle then it started to show misfires codes again. I went and got me a scanner but I don't know how to read the numbers. To make things worse the people at the DMV don't want to give more than one day temporary permit which isn't long enough for making the drive cycle.

**Whamhammer** · 08-25-2024, 08:52 PM

Originally Posted by Luckysan

Yes, it's. It has been giving me problems passing California smog test since I first bought it. The engine sounded strong but wouldn't pass the California smog test because the catalyst converter wasn't ready. I drove it for a long while trying to do the drive cycle but then it started to show an 02 sensor error code. I replaced the sensors, then it started to show multiple misfires errors code in bank 2 so I replace the spark plugs but then P0174 code lighted in up bank 2 again. A mechanic brought in a smoke machine and he fixed the leak, then he got the short and long term fuel trim numbers to be in working order. Supposedly the car was ready for the smog test but when I took it out to do the drive cycle then it started to show misfires codes again. I went and got me a scanner but I don't know how to read the numbers. To make things worse the people at the DMV don't want to give more than one day temporary permit which isn't long enough for making the drive cycle.

OK, I am confused, you are saying that it is still showing misfire codes but on the data you put up, it states zero DTCs.

Have you doublechecked the wires and coil packs to make sure that they are snug? If you have been changing plugs and working around the exhaust, a wire may have been pulled enough to act up.

As far as the readings go, and I am not an expert, but that seems to be an emissions systems check. For ignition system, you will probably have to find some other table.

Knowing that this is California, is this car stock?

**Luckysan** · 08-25-2024, 09:53 PM

The last time that I drove it was when the errors code came up showing the cylinder 6 was having multiple misfires. I switched the coil to cylinder 3 to verify it wasn't the coil. I cleared the error codes and took the reports, before taking the reports I raised the rpm to 3500 for 3 minutes, it was running strong and didn't show no error code. I haven't take it out for the drive cycle because I have to get a DMV permit so I don't get a citation for no having tags. Tomorrow I'll go and get the permit and hopefully complete the drive cycle.

As far as I can see the engine seems to be stock but I don't know much about modifications. It got the magnaflow exhaust in the back and 18" wheels & wide tires from corvette. This car has 92k miles and had the front & back lowered but the ride was awful and noisy in the back so I replaced the rear springs with stock ones. The shocks were bad so I replaced them with air shocks and 1 1/2" spacers for clearance.

**Whamhammer** · 08-26-2024, 04:18 PM

Originally Posted by Luckysan

The last time that I drove it was when the errors code came up showing the cylinder 6 was having multiple misfires. I switched the coil to cylinder 3 to verify it wasn't the coil. I cleared the error codes and took the reports, before taking the reports I raised the rpm to 3500 for 3 minutes, it was running strong and didn't show no error code. I haven't take it out for the drive cycle because I have to get a DMV permit so I don't get a citation for no having tags. Tomorrow I'll go and get the permit and hopefully complete the drive cycle.

As far as I can see the engine seems to be stock but I don't know much about modifications. It got the magnaflow exhaust in the back and 18" wheels & wide tires from corvette. This car has 92k miles and had the front & back lowered but the ride was awful and noisy in the back so I replaced the rear springs with stock ones. The shocks were bad so I replaced them with air shocks and 1 1/2" spacers for clearance.

Well..... It's possible that the one coil pack/plug wire/coil harness connector may have not been all the way making contact; that would be the best-case scenario.

You may have to drive it under load to get real results though.

**Luckysan** · 08-26-2024, 06:21 PM

Originally Posted by Whamhammer

You may have to drive it under load to get real results though.

You're right. It did happen to me already when I first bought the car. I was happy because I though the drive cycle was getting done after driving for 15 minutes at 55 mph and then the error code showed up. This time I'm going to get a report while driving to see what is happening under load. I couldn't make to DMV today, I'll do it tomorrow if I'm not too busy with work.

**Luckysan** · 09-12-2024, 07:21 PM

Hi Two days after my last post I took the car out to check it under load and after 10 minutes in the Fwy going about 60 mph the red engine light came up with the P0300 of multiples misfires. That discouraged me and I didn't mess with it until today. We discovered a leak in the secondary air injection shut off valve. We got it fixed and went for a test again. This time there wasn't any error codes and the engine seems very strong and alright. This is a picture of what the scanner report read...
Z28 Report 9-12-24 3.45pm driving Puya.jpg.

**Whamhammer** · 09-21-2024, 02:31 PM

Originally Posted by Luckysan

Hi Two days after my last post I took the car out to check it under load and after 10 minutes in the Fwy going about 60 mph the red engine light came up with the P0300 of multiples misfires. That discouraged me and I didn't mess with it until today. We discovered a leak in the secondary air injection shut off valve. We got it fixed and went for a test again. This time there wasn't any error codes and the engine seems very strong and alright. This is a picture of what the scanner report read...
Z28 Report 9-12-24 3.45pm driving Puya.jpg.

Yeah, those secondary air injection valves carbon up pretty good. Its usually a good idea to remove them once a year and clean the inside with carb cleaner and a brake cleaner chaser.