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Gasoline Fuel Injection Trouble Shooting

CONDITION POSSIBLE CAUSE CORRECTION
COLD START SYMPTOM 
  • Engine cranks, will not start
1) Fuel pump not working 1) Check fuel pump and double fuse relay, replace as necessary
2) "Cold" control pressure incorrect 2) Replace warm-up regulator if pressure not to specification
3) (CIS) Auxiliary air valve does not open 3) Replace valve
4) Cold start valve does not operate 4) Check electrical power to valve, replace valve if necessary
5) Cold start valve leaking 5) Replace valve
6) Sensor plate stop set incorrectly (CIS) 6) Adjust to specifications
7) Sensor plate and/or plunger sticking 7) Free up or replace as needed
8) Vacuum leak 8) Repair vacuum leaks
9) Fuel system leak 9) Repair fuel leaks
10) Faulty Thermo Time switch 10) Replace switch
11) Distributor triggering contacts (AFC & EFI) 11) Repair or replace as needed
12) Temperature sensors 1 & 2 (AFC & EFI) 12) Replace as necessary
  • Engine hard starting
1) "Cold" control pressure incorrect (CIS) 1) Replace warm-up regulator
2) Auxiliary air valve does not open 2) Replace valve
3) Cold start valve does not open 3) Check for electrical power to valve, replace valve if necessary
4) Cold start valve leaking 4) Replace cold start valve
5) Sensor plate stop set incorrectly (CIS) 5) Adjust sensor plate stop to specifications
6) Sensor plate and/or plunger stuck (CIS) 6) Free up or replace as necessary
7) Vacuum leak(s) 7) Repair vacuum leak(s)
8) Fuel leak(s) 8) Repair fuel leak(s)
9) Thermo Time switch does not close 9) Replace Thermo Time switch