Cause
| Correction
|
High oil pressure.
|
| • | 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. |
| • | Repair or replace damaged components as required. |
|
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.
|
| • | 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 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 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 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. |
| • | Repair or replace damaged components as required. |
|
Worn or damaged camshaft lobe.
|
| • | Inspect the valve lifters. |
| • | Repair or replace damaged components as required. |
|
Worn, damaged or loose timing chain and sprockets.
|
| • | Inspect the timing chain 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 cylinder bores. |
| • | Inspect the piston pins. |
| • | Inspect the connecting rods. |
| • | Repair or replace damaged components as required. |
|
