4
Table 3
CO HC Problems Causes
1. Fault
. Incorrect ignition timing
. Fouled, shorted or improperly clearance of spark plug
2. Incorrect valve clearance
3. Leaky intake & exhaust valves
4. Leaky cylinders
1. Air leaks
. PCV hoses, intake manifold
. Throttle body
. Brake booster circuit
2. Lean mixture gas causing misfire
1. Clogged air filter
2. Clogged PCV valve
. Faulty ECU
. Faulty fuel pressure regulator
. Faulty water temperature sensor
. Faulty air compressor
. Faulty injectors
. Faulty throttle position sensor
Normal
Low High
High High
Rough idle
(Black smoke
from exhaust
pipe)
Rough idle
Rough idleHigh
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