Engine Hesitates And/Or Poor Acceleration - Toyota MR2 1988 Repair Manual

EFI SYSTEM - Troubleshooting
Fl-19
SYMPTOM- ENGINE HESITATES AND/OR POOR ACCELERATION
CHECK CLUTCH OR BRAKE
BAD
11. Clutch Slips
I
2. Brakes - Drag
l
OK
CHECK FOR VACUUM LEAKS IN AIR
BAD
1 . Oil filler cap
INTAKE LINE 2. Oil level gauge
3. Hose connections
4. PCV hose
5. EGA system - EGA valve stays open
~
OK
CHECK AIR FILTER ELEMENT
BAD
I
Element
Clean or replace
I
l
OK
CHECK DIAGNOSIS SYSTEM Malfunction Diagnosis code(s) (See pages Fl-24 to 27)
Check for output of diagnosis code.
code
(See page Fl-21)
~
Normal code
CHECK IGNITION SPARK
BAD
1. High-tension cords
1. Unplug connectors of injector 2. Distributor
and start injection time switch. 3. Ignition coil, Igniter
2. Check by holding spark plug
8 - 1 0 mm (0.31 - 0.39 in.) away
from engine block while cranking engine.
A strong spark should be noted.
~
OK
CHECK IGNITION TIMING
NO
Ignition timing Adjust
1. Short terminals T and E, of the (See page IG-11)
check connector.
2. Check ignition timing.
STD:
1
oo
BTDC
@
Idling
(w/short-circuited T- E1)
~
OK
CHECK FUEL PRESSURE
BAD
1. Fuel pump (See page Fl-64)
(See page Fl-65 or 68)
2. Fuel filter
3. Fuel pressure regulator (See page Fl-78
or 79)
~
OK
CHECK INJECTORS
BAD
Injection condition
(See page Fl-80)
~
OK
CONTINUED ON PAGE Fl-20