Subaru 1600 Service Manual page 162

FUEL SYSTEM
Trouble and possible cause
Corrective action
I
5. Hesitation
1) Clogged slow jet, main jet, or emulsion tube.
Clean.
2) Clogged by·pass hole or slow system passage.
Clean.
3) Improper idle adjustment.
Inspect and adjust.
4) Malfunction of secondary throttle valve. Adjust.
6. Poor acceleration
1) Defective accelerating pump piston or piston return
Replace.
spring.
2) Malfunction of accelerating pump inlet valve or
Replace.
outlet valve.
3) Clogged pump nozzle.
Clean.
4) Malfunction of accelerating pump linkage.
Repair.
5) Defective power valve.
Replace.
6) Malfunction of power valve piston.
Inspect and replace.
7) Improper float level.
Adjust float leveL
8) Malfunction of throttle valve.
Adjust.
7. Poor high.speed performance
1) Clogged main jet.
Clean.
2) Improper throttle valve opening.
Adjust.
3) Worn throttle valve shaft.
Replace.
4) Improper float level. Adjust float level.
5) Damaged gaskets.
Replace.
8. Difficulty in starting at low temperatures
I) Malfunction of choke valve.
Adjust.
2) Malfunction of choke linkage. Adjust.
3) Improper fast idle opening.
Adjust.
4) Improper adjustments of automatic choke.
Adjust.
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