14–4
–ENGINE MECHANICAL ENGINE ASSEMBLY (2AZ–FE)
1526Author: Date:
2002 CAMRY REPAIR MANUAL (RM881U)
CO HC Problems Causes
Normal High Rough idle
1. Faulty ignitions:
Incorrect timing
Fouled, shorted or improperly gapped plugs
2. Incorrect valve clearance
3. Leaky intake and exhaust valves
4. Leaky cylinders
Low High
Rough idle
(Fluctuating HC reading)
1. Vacuum leaks:
PCV hoses
Intake manifold
Throttle body
ISC valve
Brake booster line
2. Lean mixture causing misfire
High High
Rough idle
(Black smoke from exhaust)
1. Restricted air filter
2. Plugged PCV valve
3. Faulty EFI systems:
Faulty pressure regulator
Defective water temperature sensor
DEFECTIVE Air–flow meter
Faulty ECU
Faulty injectors
Faulty throttle position sensor
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