Subaru 1600 Service Manual page 114

ENGINE
Trouble and possible cause
Corrective action
6) Deterioration or damage of valve
Replace.
spring
7) Seizure or worn piston ring, cylinder, Repair or replace.
piston
8) Improper valve timing
Disassemble and correct.
9)
Improper engine oil (low viscosity)
Replace with oil of proper grade.
3. Lowoutput, I. Defective
I
I) Improper ignition timing
Adjust.
hesitation,
ignition system
poor accelera· 2) Defective spark plug.
tion
• Improper spark plug gap Adjust or replace.
• Fouled spark plug
Clean or replace.
• Defective insulator
Replace.
3) Defective cord or wiring
•
Loose and/or damaged contacts of
Inspect, repair or replace.
ignition system connection
• Defective cords or wires Replace.
4) Others
See "Troubleshooting" in
Chapter 15.
-
2. Defective fuel
1) Improper idle speed and mixture
Adjust.
and air intake
system 2) Clogged air cleaner element
Replace.
3) Defective carburetor
• Improper float level Adjust.
• Clogged main jet
Clean
• Defective accelerator pump Inspect, repair or replace.
• Malfunction of secondary
Inspect, repair or replace.
diaphragm (Hitachi carburetor)
• Defective power valve (Hitachi Inspect, clean or replace.
carburetor)
• Malfunction of ECC system Refer to Chapter 5.
I
• Others
See "Troubleshooting of carburetor"
in Chapter 4.
4)
Defective fuel pump, filter, delivery
See "Troubleshooting of fuel system"
line, etc.
in Chapter 4.
5) Vacuum leaks (vacuum lines, etc.)
inspect, repair or replace.
3. Insufficient 1) Improper valve clearance
Adjust.
engine com-
pression pres- 2)
Loose spark plug or defective gasket
Tighten or replace.
sure
3) Loose cylinder head nuts or defective Tighten or replace.
head gasket
4) Others See 3-3, 2 in this Chapter.