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Toyota Tundra (2015 year). Manual - part 1348
(1) Check the A/F sensor operation
and heated oxygen sensor operation
.
(2) See the table below for possible causes, and then inspect and correct the applicable causes if
necessary.
CO
HC
SYMPTOM
CAUSE
Normal High Rough idle
Faulty ignitions:
Incorrect timing
Plugs (contaminated, shorted or gaps are
defective)
1.
Incorrect valve clearance
2.
Leaky intake and exhaust valves
3.
Leaky cylinder
4.
Low
High
Rough idle
(Fluctuating HC reading)
Vacuum leaks:
PCV hose
Intake manifold
Throttle body
Brake booster line
1.
Lean mixture causing misfire
2.
High
High
Rough idle
(Black smoke from
exhaust)
Restricted air filter
1.
Faulty SFI system:
Faulty pressure regulator
Defective ECT sensor
Faulty ECM
Faulty injectors
Faulty throttle position sensor
Faulty MAF meter
2.
1UR-FE ENGINE MECHANICAL: ENGINE: ON-VEHICLE INSPEC...