Suzuki Samurai 1986 Service Manual page 45

Condition
Erratic idling
(Improper engine
idling)
Abnormal detonation
2-6
Possible cause
Abnormal condition in fuel system
1. Clogged carburetor jets
2. Incorrect idle adjustment
3. Clogged air cleaner element
4. Leaky manifold, carburetor or cylinder
head gaskets
5. Improper float level
6. Malfunctioning choke system
7. Malfunctioning fuel cut solenoid valve
Others
1. Loose connection or disconnection. of
vacuum hoses
2. Malfunctioning PCV valve
3. Low compression
4. Loose carburetor and intake manifold bolts
and nuts
5. Leaky carburetor and intake manifold
gaskets
Abnormal condition in ignition system
1. Spark plugs tending to overheat
2. Improper ignition timing
3. Loose connection in high-tension or low-
tension circuit.
Abnormal condition in fuel system
1. Clogged fuel filter and fuel lines
2. Clogged carburetor jets
3. Improper adjustment of float level
4. Malfunctioning fuel pump
5. Air inhaling from intake manifold and
carburetor gaskets
Abnormal condition in engine
1. Excessive carbon deposit on piston crowns
or cylinder head
2. Blown cylinder head gasket, resulting in
low compression pressure
3. Improper valve clearance
4. Valves tending to seize
5. Weakened valve springs
Others
Malfunctioning EGR valve
Correction
Clean
Adjust
Clean or replace
Replace
Adjust
Adjust or replace
Replace
Connect
Check and replace as
necessary
Previously outlined
Tighten bolts and nuts
Replace
Change plug heat value
Adjust
Retighten
Replace or clean
Clean
Adjust
Replace
Replace
Clean
Replace
Adjust
Replace
Replace
Replace