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2000 GMC 3500HD 7.4L Misfire
Engine idles fine and will rev fine if you give it just a little throttle. Try to give it a heavy throttle and the engine starts missing, if the throttle is held steady at any RPM the engine runs smooth with no miss but as soon as you try to give it some throt...
FIX posted 2/1/2010
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9 Replies Received
| VIN | 1GDKC34J5Y |
| Engine | 7.4 L / 8 cyl |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | Misfire |
| Occurs | On Accel |
| Misc. | California Emissions W/O Smog Pump |
Trouble Codes
| P0131 | Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage |
| P0134 | Air Fuel Sensor (Bank 1 Sensor 1) Heater System Malfunction |
| P0135 | Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Malfunction |
| P0154 | Air Fuel Sensor (Bank 2 Sensor 1) Heater Circuit Malfunction |
| P0155 | Heated Oxygen Sensor (Bank 2 Sensor 1) Heater Circuit Malfunction |
| P0171 | Fuel System Too Lean (Bank 1) |
Message Closed w/FIX
Vehicle Data
2000 GMC 3500HD
| VIN | 1GDKC34J5Y |
| Engine | 7.4 L / 8 cyl |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | Misfire |
| Occurs | On Accel |
| Misc. | California Emissions W/O Smog Pump |
Trouble Codes
| P0131 | Heated Oxygen Sensor (Bank 1 Sensor 1) Circuit Low Voltage |
| P0134 | Air Fuel Sensor (Bank 1 Sensor 1) Heater System Malfunction |
| P0135 | Heated Oxygen Sensor (Bank 1 Sensor 1) Heater Circuit Malfunction |
| P0154 | Air Fuel Sensor (Bank 2 Sensor 1) Heater Circuit Malfunction |
| P0155 | Heated Oxygen Sensor (Bank 2 Sensor 1) Heater Circuit Malfunction |
| P0171 | Fuel System Too Lean (Bank 1) |
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