296 TROUBLESHOOTING
Condition
Possible Cause
Engine idles roughly and
stalls
1. Incorrect idle speed
2. Clogged fuel filter
3. Dirt in fuel system or carburetor
4. Loose carburetor screws or attaching bolts
5. Broken carburetor gaskets
6. Air leaks
7. Dirty carburetor
8. Worn idle mixture needles
9. Throttle valves stuck open
10. Incorrectly adjusted float or fuel level
11. Clogged air filter
Engine runs unevenly or
surges
1. Defective fuel pump
2. Dirty or clogged fuel filter
3. Plugged, loose or incorrect main metering jets or rods
4. Air leaks
5. Bent or sticking main metering rods
6. Stuck power piston
7. Incorrect float adjustment
8. Incorrect idle speed or mixture
9. Dirty or plugged idle system passages
10. Hard, brittle or broken gaskets
11. Loose attaching or mounting screws
12. Stuck or misaligned secondary throttle valves
Poor fuel economy
1. Poor driving habits
2. Stuck choke valve
3. Binding choke linkage
4. Stuck heat riser
5. Incorrect idle mixture
6. Defective accelerator pump
7. Air leaks
8. Plugged, loose or incorrect main metering jets
9. Improperly adjusted float or fuel level
10. Bent, misaligned or fuel-clogged float
11. Leaking float needle seat
12. Fuel leak
13. Accelerator pump discharge ball not seating properly
14. Incorrect main jets
Engine lacks high speed per-
formance or power
1. Incorrect throttle linkage adjustment
2. Stuck or binding power piston
3. Defective accelerator pump
4. Air leaks
5. Incorrect float setting or fuel level
6. Dirty, plugged, worn or incorrect main metering jets or rods
7. Binding or sticking air valve
8. Brittle or cracked gaskets
9. Bent, incorrect or improperly adjusted secondary metering
rods
10. Clogged fuel filter
11. Clogged air filter
12. Defective fuel pump
TROUBLESHOOTING FUEL INJECTION PROBLEMS
Each fuel injection system has its own unique 4 of this Repair & Tune-Up Guide for specific
components and test procedures, for which it test and repair procedures, if the vehicle is
is impossible to generalize. Refer to Chapter equipped with fuel injection.
Содержание 1963 Corvette
Страница 29: ...3 0 1973 3 0 15 18 Is 454 8 18 24 15 4 0...
Страница 36: ...GENERAL INFORMATION AND MAINTENANCE 31 CM E 8 in 1 o s 1 O 1 8 o o o o CD o o o CO E o o o co JD in fCD I ts...
Страница 83: ...OHMMETER OHMMETER Stator testing perforated case models...
Страница 125: ...Wear ridge must be removed before piston removal...
Страница 161: ...14 Vacuum piston 15 Vacuum piston spring 16 Pump plunger assembly 17 Pump plunger return spring 18 Primary float...
Страница 205: ...EMISSION CONTROLS AND FUEL SYSTEM 187 8 CO 8 8 8 8 inCM CO 8 CM I I I IS N ino 1...