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Home / DTC / P0284 — Cylinder 8 Contribution/Balance

P0284 — Cylinder 8 Contribution/Balance

Detailed page for trouble code P0284.

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22,491specific
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Code

P0284

Generic P — Powertrain

Cylinder 8 Contribution/Balance

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or weak fuel injector on cylinder 8
  • Ignition problem (coil, spark plug, plug wire) for cylinder 8
  • Low compression or mechanical problem on cylinder 8 (valve, piston, head gasket)
  • Fuel delivery issue (low rail pressure, clogged injector)
  • Vacuum or intake leak affecting cylinder 8
  • Wiring or connector fault to injector or ignition coil

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine rough idle or vibration
  • Reduced engine power and acceleration
  • Intermittent or consistent misfire on cylinder 8
  • Increased fuel consumption and emissions
  • Possible engine stumbling or hesitation under load

What to check

  • Read and record freeze-frame data and pending/confirmed codes with a scan tool
  • Check cylinder-specific misfire counters and cylinder contribution/balance readings
  • Inspect spark plug, coil, and ignition wiring for cylinder 8
  • Visually inspect injector connector and wiring for damage or corrosion
  • Measure fuel rail pressure and inspect fuel supply
  • Perform a relative compression or cylinder contribution test

Signal parameters

  • Injector pulse width (ms) — monitor for expected pulses and symmetry with other cylinders
  • Cylinder contribution % or learned per-cylinder trims (compare cylinder 8 to others)
  • Misfire counters for cylinder 8 (counts and timing)
  • Short-term and long-term fuel trims (STFT/LTFT)
  • Fuel rail pressure (psi/bar) and regulator behavior
  • Crankshaft/Camshaft sync signals (for timing-related contribution issues)

Diagnostic algorithm

  1. Retrieve all codes and freeze-frame data. Clear codes and perform a road test to confirm repeatability and capture live data.
  2. Check misfire counters and cylinder contribution values with a scan tool; note when the imbalance occurs (idle, warm, load).
  3. Visually inspect coil, spark plug, and ignition wiring on cylinder 8; replace or swap coil/plug with another cylinder and see if code follows.
  4. Inspect injector connector and wiring for corrosion, high resistance, or broken pins. Wiggle-test wiring while monitoring for changes.
  5. Swap the injector with another cylinder (or swap injector driver using proper safety procedures) to determine if injector is faulty.
  6. Measure fuel rail pressure and confirm regulator and supply are within specification under load.
  7. Perform a relative compression test or cylinder contribution test; if low, follow with static compression and/or leak-down on cylinder 8.
  8. Check for intake manifold gasket leaks or external vacuum leaks near cylinder 8 that could lean that cylinder.
  9. Inspect for mechanical issues: burned valve, carbon buildup, oil-fouled plug, or head gasket failure at cylinder 8.
  10. If electrical and mechanical checks are good, review ECM inputs (crank/cam sensors) and consider ECM reflash or replacement if manufacturer bulletin/updates exist.
  11. After repairs, clear codes and verify proper operation over varied conditions; confirm cylinder contribution has returned to normal.

Likely causes

  • Faulty injector (stuck, clogged, electrical open/short)
  • Weak ignition (bad coil or spark plug) on cylinder 8
  • Low cylinder compression (worn rings, valve seating, head gasket)
  • Wiring/connector issue to injector or coil
  • Fuel rail pressure low or inconsistent

Fault status

⚠️ Status
Cylinder 8 contribution/balance outside expected range — ECM detected reduced combustion contribution from cylinder 8.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours
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Code

P0284

GWM P — Powertrain

- 8 cylinder is incorrectly balanced

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or weak fuel injector on cylinder 8
  • Ignition problem (coil, spark plug, plug wire) for cylinder 8
  • Low compression or mechanical problem on cylinder 8 (valve, piston, head gasket)
  • Fuel delivery issue (low rail pressure, clogged injector)
  • Vacuum or intake leak affecting cylinder 8
  • Wiring or connector fault to injector or ignition coil

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine rough idle or vibration
  • Reduced engine power and acceleration
  • Intermittent or consistent misfire on cylinder 8
  • Increased fuel consumption and emissions
  • Possible engine stumbling or hesitation under load

What to check

  • Read and record freeze-frame data and pending/confirmed codes with a scan tool
  • Check cylinder-specific misfire counters and cylinder contribution/balance readings
  • Inspect spark plug, coil, and ignition wiring for cylinder 8
  • Visually inspect injector connector and wiring for damage or corrosion
  • Measure fuel rail pressure and inspect fuel supply
  • Perform a relative compression or cylinder contribution test

Signal parameters

  • Injector pulse width (ms) — monitor for expected pulses and symmetry with other cylinders
  • Cylinder contribution % or learned per-cylinder trims (compare cylinder 8 to others)
  • Misfire counters for cylinder 8 (counts and timing)
  • Short-term and long-term fuel trims (STFT/LTFT)
  • Fuel rail pressure (psi/bar) and regulator behavior
  • Crankshaft/Camshaft sync signals (for timing-related contribution issues)

Diagnostic algorithm

  1. Retrieve all codes and freeze-frame data. Clear codes and perform a road test to confirm repeatability and capture live data.
  2. Check misfire counters and cylinder contribution values with a scan tool; note when the imbalance occurs (idle, warm, load).
  3. Visually inspect coil, spark plug, and ignition wiring on cylinder 8; replace or swap coil/plug with another cylinder and see if code follows.
  4. Inspect injector connector and wiring for corrosion, high resistance, or broken pins. Wiggle-test wiring while monitoring for changes.
  5. Swap the injector with another cylinder (or swap injector driver using proper safety procedures) to determine if injector is faulty.
  6. Measure fuel rail pressure and confirm regulator and supply are within specification under load.
  7. Perform a relative compression test or cylinder contribution test; if low, follow with static compression and/or leak-down on cylinder 8.
  8. Check for intake manifold gasket leaks or external vacuum leaks near cylinder 8 that could lean that cylinder.
  9. Inspect for mechanical issues: burned valve, carbon buildup, oil-fouled plug, or head gasket failure at cylinder 8.
  10. If electrical and mechanical checks are good, review ECM inputs (crank/cam sensors) and consider ECM reflash or replacement if manufacturer bulletin/updates exist.
  11. After repairs, clear codes and verify proper operation over varied conditions; confirm cylinder contribution has returned to normal.

Likely causes

  • Faulty injector (stuck, clogged, electrical open/short)
  • Weak ignition (bad coil or spark plug) on cylinder 8
  • Low cylinder compression (worn rings, valve seating, head gasket)
  • Wiring/connector issue to injector or coil
  • Fuel rail pressure low or inconsistent

Fault status

⚠️ Status
Cylinder 8 contribution/balance outside expected range — ECM detected reduced combustion contribution from cylinder 8.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours
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Code

P0284

HUMMER P — Powertrain

Cylinder 8 Contribution/Balance Fault

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or weak fuel injector on cylinder 8
  • Ignition problem (coil, spark plug, plug wire) for cylinder 8
  • Low compression or mechanical problem on cylinder 8 (valve, piston, head gasket)
  • Fuel delivery issue (low rail pressure, clogged injector)
  • Vacuum or intake leak affecting cylinder 8
  • Wiring or connector fault to injector or ignition coil

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine rough idle or vibration
  • Reduced engine power and acceleration
  • Intermittent or consistent misfire on cylinder 8
  • Increased fuel consumption and emissions
  • Possible engine stumbling or hesitation under load

What to check

  • Read and record freeze-frame data and pending/confirmed codes with a scan tool
  • Check cylinder-specific misfire counters and cylinder contribution/balance readings
  • Inspect spark plug, coil, and ignition wiring for cylinder 8
  • Visually inspect injector connector and wiring for damage or corrosion
  • Measure fuel rail pressure and inspect fuel supply
  • Perform a relative compression or cylinder contribution test

Signal parameters

  • Injector pulse width (ms) — monitor for expected pulses and symmetry with other cylinders
  • Cylinder contribution % or learned per-cylinder trims (compare cylinder 8 to others)
  • Misfire counters for cylinder 8 (counts and timing)
  • Short-term and long-term fuel trims (STFT/LTFT)
  • Fuel rail pressure (psi/bar) and regulator behavior
  • Crankshaft/Camshaft sync signals (for timing-related contribution issues)

Diagnostic algorithm

  1. Retrieve all codes and freeze-frame data. Clear codes and perform a road test to confirm repeatability and capture live data.
  2. Check misfire counters and cylinder contribution values with a scan tool; note when the imbalance occurs (idle, warm, load).
  3. Visually inspect coil, spark plug, and ignition wiring on cylinder 8; replace or swap coil/plug with another cylinder and see if code follows.
  4. Inspect injector connector and wiring for corrosion, high resistance, or broken pins. Wiggle-test wiring while monitoring for changes.
  5. Swap the injector with another cylinder (or swap injector driver using proper safety procedures) to determine if injector is faulty.
  6. Measure fuel rail pressure and confirm regulator and supply are within specification under load.
  7. Perform a relative compression test or cylinder contribution test; if low, follow with static compression and/or leak-down on cylinder 8.
  8. Check for intake manifold gasket leaks or external vacuum leaks near cylinder 8 that could lean that cylinder.
  9. Inspect for mechanical issues: burned valve, carbon buildup, oil-fouled plug, or head gasket failure at cylinder 8.
  10. If electrical and mechanical checks are good, review ECM inputs (crank/cam sensors) and consider ECM reflash or replacement if manufacturer bulletin/updates exist.
  11. After repairs, clear codes and verify proper operation over varied conditions; confirm cylinder contribution has returned to normal.

Likely causes

  • Faulty injector (stuck, clogged, electrical open/short)
  • Weak ignition (bad coil or spark plug) on cylinder 8
  • Low cylinder compression (worn rings, valve seating, head gasket)
  • Wiring/connector issue to injector or coil
  • Fuel rail pressure low or inconsistent

Fault status

⚠️ Status
Cylinder 8 contribution/balance outside expected range — ECM detected reduced combustion contribution from cylinder 8.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

P0284

LAND ROVER P — Powertrain

Cylinder 8 contribution / balance

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or weak fuel injector on cylinder 8
  • Ignition problem (coil, spark plug, plug wire) for cylinder 8
  • Low compression or mechanical problem on cylinder 8 (valve, piston, head gasket)
  • Fuel delivery issue (low rail pressure, clogged injector)
  • Vacuum or intake leak affecting cylinder 8
  • Wiring or connector fault to injector or ignition coil

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine rough idle or vibration
  • Reduced engine power and acceleration
  • Intermittent or consistent misfire on cylinder 8
  • Increased fuel consumption and emissions
  • Possible engine stumbling or hesitation under load

What to check

  • Read and record freeze-frame data and pending/confirmed codes with a scan tool
  • Check cylinder-specific misfire counters and cylinder contribution/balance readings
  • Inspect spark plug, coil, and ignition wiring for cylinder 8
  • Visually inspect injector connector and wiring for damage or corrosion
  • Measure fuel rail pressure and inspect fuel supply
  • Perform a relative compression or cylinder contribution test

Signal parameters

  • Injector pulse width (ms) — monitor for expected pulses and symmetry with other cylinders
  • Cylinder contribution % or learned per-cylinder trims (compare cylinder 8 to others)
  • Misfire counters for cylinder 8 (counts and timing)
  • Short-term and long-term fuel trims (STFT/LTFT)
  • Fuel rail pressure (psi/bar) and regulator behavior
  • Crankshaft/Camshaft sync signals (for timing-related contribution issues)

Diagnostic algorithm

  1. Retrieve all codes and freeze-frame data. Clear codes and perform a road test to confirm repeatability and capture live data.
  2. Check misfire counters and cylinder contribution values with a scan tool; note when the imbalance occurs (idle, warm, load).
  3. Visually inspect coil, spark plug, and ignition wiring on cylinder 8; replace or swap coil/plug with another cylinder and see if code follows.
  4. Inspect injector connector and wiring for corrosion, high resistance, or broken pins. Wiggle-test wiring while monitoring for changes.
  5. Swap the injector with another cylinder (or swap injector driver using proper safety procedures) to determine if injector is faulty.
  6. Measure fuel rail pressure and confirm regulator and supply are within specification under load.
  7. Perform a relative compression test or cylinder contribution test; if low, follow with static compression and/or leak-down on cylinder 8.
  8. Check for intake manifold gasket leaks or external vacuum leaks near cylinder 8 that could lean that cylinder.
  9. Inspect for mechanical issues: burned valve, carbon buildup, oil-fouled plug, or head gasket failure at cylinder 8.
  10. If electrical and mechanical checks are good, review ECM inputs (crank/cam sensors) and consider ECM reflash or replacement if manufacturer bulletin/updates exist.
  11. After repairs, clear codes and verify proper operation over varied conditions; confirm cylinder contribution has returned to normal.

Likely causes

  • Faulty injector (stuck, clogged, electrical open/short)
  • Weak ignition (bad coil or spark plug) on cylinder 8
  • Low cylinder compression (worn rings, valve seating, head gasket)
  • Wiring/connector issue to injector or coil
  • Fuel rail pressure low or inconsistent

Fault status

⚠️ Status
Cylinder 8 contribution/balance outside expected range — ECM detected reduced combustion contribution from cylinder 8.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours
320

Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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