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 balancer
(A misfire DTC may be present without an actual misfire condition.)
|
| • | Inspect the crankshaft balancer. |
| • | 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. However, a DTC P0300 may be set. |
| • | Systems with mechanical communications (high voltage switch) and
severe reluctor ring damage may cause additional pulses and effect fuel and
spark delivery. A DTC P0300 or P0336 may be set.) |
|
| • | 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 MAP sensor (sealing grommet nicked, torn
or missing)
|
| • | Inspect the MAP sensor. |
| • | Repair or replace damaged components as required. |
|
Damaged or improperly installed throttle body
|
| • | Inspect the 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. |
| • | Verify engine compression. |
| • | Inspect the cylinder heads. |
| • | Inspect the engine block. |
| • | Repair or replace damaged components as required. |
|
Worn, damaged or loose valve rocker arm
|
| • | Inspect the valve rocker arms. |
| • | Repair or replace damaged components as required. |
|
Worn, damaged or loose valve rotator
|
| • | Inspect the valve rotators. |
| • | 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. |
| • | Repair or replace damaged components as required. |
|
Worn, damaged, loose or bent valve push rod
|
| • | Inspect the valve push rods. |
| • | 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 spark plugs. |
| • | Verify engine compression. |
| • | Inspect the cylinder bores. |
| • | Inspect the piston pins. |
| • | Inspect the connecting rods. |
| • | Repair or replace damaged components as required. |
|
