Cause
| Correction
|
High Oil Pressure
|
- Verify oil pressure. Refer to
Oil Pressure Diagnosis and Testing
.
- Repair or replace damaged components as required.
|
Worn, damaged, or improperly installed accessory drive belt - severe cracking, bumps or missing segments.
A misfire DTC may be present without an actual misfire condition.
|
- Inspect the accessory drive system components.
- Repair or replace damaged components as required.
|
Worn, damaged, or improperly installed accessory drive system components.
A misfire DTC may be present without an actual misfire condition.
|
- Inspect the accessory drive system components.
- Repair or replace damaged components as required.
|
Damaged, loose or improperly installed crankshaft pulley.
A misfire DTC may be present without an actual misfire condition.
| Inspect the crankshaft pulley.
|
Worn, damaged, or improperly installed crankshaft reluctor wheel.
A worn or damaged crankshaft reluctor wheel can result in different symptoms depending on the severity and location of the wear or damage.
| • | Systems with electronic communications, DIS or coil per cylinder, and severe reluctor ring damage may exhibit periodic loss of crankshaft position, stop delivering a signal, and then re-sync the crankshaft position. |
| • | Systems with electronic communication, DIS or coil per cylinder, and slight reluctor ring damage may exhibit no loss of crankshaft position and no misfire may occur. |
| • | Systems with mechanical communications, high voltage switch, and severe reluctor ring damage may cause additional pulses and effect fuel and spark delivery. |
|
- Inspect the crankshaft position sensor.
- Inspect the crankshaft reluctor wheel.
- Inspect the crankshaft.
- Repair or replace damaged components as required.
|
Damaged, loose or improperly installed engine flywheel. A misfire DTC may be present without an actual misfire condition.
|
- Inspect the flywheel.
- Repair or replace damaged components as required.
|
Damaged, improperly installed or restricted exhaust system, collapsed or dented pipes, plugged mufflers or malfunctioning catalytic converters.
A DTC may be present without an actual fault condition.
|
- Inspect the exhaust system components.
- Repair or replace damaged components as required.
|
Worn, damaged or improperly installed vacuum hoses.
|
- Inspect the vacuum system components.
- Repair or replace damaged components as required.
|
Damaged or improperly installed MAP sensor, sealing grommet nicked, torn or missing.
|
- Inspect the MAP sensor.
- Repair or replace damaged components as required.
|
Damaged or improperly installed electronic throttle body.
|
- Inspect the electronic throttle body.
- Repair or replace damaged components as required.
|
Damaged or improperly installed intake manifold.
|
- Inspect the intake manifold.
- Repair or replace damaged components as required.
|
Damaged or improperly installed cylinder head.
Oil consumption may or may not cause the engine to misfire.
|
- Inspect the spark plugs. Refer to
Spark Plug Inspection
.
- Verify engine compression. Refer to
Engine Compression Test
.
- Inspect the cylinder heads.
- Inspect the engine block.
- Repair or replace damaged components as required.
|
Worn, damaged, loose or broken valve spring.
|
- Inspect the valve springs.
- Repair or replace damaged components as required.
|
Worn, damaged or stuck valve, carbon on the valve stem or valve seat.
|
- Inspect the valves.
- Inspect the valve guides.
- Repair or replace damaged components as required.
|
Worn or damaged valve guide.
|
- Inspect the valve guides.
- Inspect the valve guides. Inspect the valves.
- Repair or replace damaged components as required.
|
Worn, damaged or dirty valve lifter.
|
- Inspect the valve lifters.
- Inspect the camshaft.
- Repair or replace damaged components as required.
|
Worn or damaged camshaft lobe.
|
- Inspect the camshaft.
- Inspect the valve lifters.
- Repair or replace damaged components as required.
|
Worn, damaged or loose timing belt and sprockets.
|
- Inspect the timing belt and sprockets.
- Repair or replace damaged components as required.
|
Worn, damaged or improperly installed piston. Pistons must be installed with the mark, or dimple, on the top of the piston, facing the front of the engine; piston pins must be centered in the connecting rod pin bore.
Oil consumption may or may not cause the engine to misfire.
|
- Inspect the spark plugs. Refer to
Spark Plug Inspection
.
- Verify engine compression. Refer to
Engine Compression Test
.
- Inspect the cylinder bores.
- Inspect the pistons.
- Inspect the piston pins.
- Inspect the connecting rods.
- Repair or replace damaged components as required.
|
