Page 1185 of 2389

EFI system problem
Vacuum leak
a PCV line
wEGR tine
wIntake manifold
wAir intake chamber
wThrottle body
wISC valve
wBrake booster fine
Pulling in air between air flow meter and
throttle body
Insufficient fuel flow incorrect ignition tim-
ing
Incorrect valve clearance
Carbon deposits in combustion cham-
bers
Oil leak
PCV line clogged
Piston ring worn or damaged
Valve stem and guide bushing worn
Valve stem oil seal wornRepair as necessary
Check PCV system
Check rings
Check valves and guide bushing
Check seals Troubleshoot fuel system
Reset timing
Adjust valve clearance
Inspect cylinder headRepair as necessary
Check hoses and repair as
necessary Air cleaner clogged
EM system problem
Incorrect ignition timing EFI system problems
Incorrect ignition timing
EGR system faulty
Deceleration fuel cut system always off
Check air cleaner
Repair as necessary
Reset timing Repair as necessary
Reset timing
Check EGR system
EXCESSIVE OIL CONSUMPTION
Engine diesels
(runs after ignition switch
is turned off)
Muffler explosion
(after fire) on
deceleration only
FI±10
IG ±16, 20
EM±11, 15
EM±56, 84 Muffler explosion
(after fire) all the time
AFTER FIRE, BACKFIRE
EC±4, 15
EM±123, 156
EM±57,85
ENGINE DIESELING
Check EFI (fuel cut) system
Excessive oil
consumptionRepair as necessary
IG±16, 20
EC±8, 21
Engine backfires
Possible cause Possible cause
Possible causelG±16, 20 Problem
Problem
RemedyRemedy
ProblemRemedy
Page Page
MA±5Page
± ENGINE MECHANICALTroubleshootingEM±8
Page 1186 of 2389
Fuel leak
Air cleaner clogged
Incorrect ignition timing
EFI system problems
wInjector faulty
wDeceleration fuel cut system faulty
Idle speed too high
Spark plug faulty
EGR system always on
Low compression
Tires improperly inflated
Clutch slips
Brakes drag
Incorrect idle speed
Incorrect ignition timing
Vacuum leaks
wPCV line
wEGR line
wIntake manifold
wAir intake chamber
wThrottle body
wISC valve
wBrake booster line
EFI system problemsCheck ISC system
Inspect plugs
Check EGR system
Check compression
Inflate tires to proper pressure
Troubleshoot clutch
Troubleshoot brakesRepair as necessary
Check air cleaner
Reset timing
Repair as necessary
EXCESSIVE FUEL CONSUMPTION
Check ISC system
Reset timing
Repair as necessaryFI±116,118
IG±6, 10
EC±8, 21
EM±22
UNPLEASANT ODOR
Poor gasoline
mileage
FI±116, 118
IG±16, 20
Repair as necessaryMA±5
IG±16, 20
Unpleasant odorPossible cause Possible cause
Problem
ProblemRemedy
RemedyPage Page
± ENGINE MECHANICALTroubleshootingEM±9
Page 1187 of 2389

ENGINE TUNE±UP
INSPECTION OF ENGINE COOLANT
(See steps 1 and 2 on page CO±4)
INSPECTION OF ENGINE OIL
(See steps 1 and 2 on page LU±6)
INSPECTION OF BATTERY
(See steps 1 and 2 on page CH±3)
Standard specific gravity:
1.25 ±1.27 when fully charged at 2O°C (68°F)
INSPECTION OF AIR FILTER
(See step 3 on page MA±5)
INSPECTION OF HIGH±TENSION CORDS
(See page IG±6 or 10)
Maximum resistance: 25 kW per cord
INSPECTION OF SPARK PLUGS (3S±FE)
(See page IG±6)
Correct electrode gap: 1.1 mm (0.043 in.)
Recommended spark plugs:
ND Q16R±U11
NGK BCPR5EY11
INSPECTION OF SPARK PLUGS (2VZ±FE)
(See page IG±10)
Correct electrode gap of new plug:
1.1 mm (0.043 in.)
Maximum electrode gap: 1.3 mm (0.051 in.)
Recommended spark plugs:
ND P020R
NGK BCPR6EP11
INSPECTION OF ALTERNATOR DRIVE BELT
(See step 3 on page CH±3)
Drive belt tension:
3S±FE w/ A/C New belt 175 +5 Ib
Used belt 130 +10 Ib
w/o A/C New belt 125 +25 Ib
Used belt 95 +20 Ib
2VZ±FE New belt 175 +5 Ib
Used belt 115 +20 Ib
± ENGINE MECHANICALEngine Tune±UpEM±10
Page 1188 of 2389

3. ADJUST VALVE CLEARANCE
(a) Check the only those valves indicated.
wUsing a feeler gauge, measure the clearance between the valve
lifter and camshaft.
wRecord the valve clearance measurements which are out of
specification. They will be used later to determine the required
replacement adjusting shim.
Valve clearance (Cold):
Intake 0.19 ± 0.29 mm (0.007 ± 0.011 in.)
Exhaust 0.28 ± 0.38 mm(0.011 ± 0.015 in.)
(b) Turn the crankshaft one revolution (360°) and align the
mark as above. (See procedure step 2)
(c) Check only the valves indicated as shown.
Measure the valve clearance. (See procedure step (a))
(d) Remove the adjusting shim.
wTurn the crankshaft to position the cam lobe of the cam-
shaft on the adjusting valve upward.
wUsing SST (A), press down the valve lifter and place
SST (B) between the camshaft and valve lifter.
Remove SST (A).
SST 09248±55010
HINT: Before pressing down the valve lifter, position the
notch the spark plug.2. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley and align its groove with the tim-
ing mark º0º of the No±1 timing belt cover.
(b) Check that the valve lifters, on the No±1 cylinder are loose
and valve lifters on the No.4 are tight.
If not, turn the crankshaft one revolution (360°) and align
the mark as above.
ADJUSTMENT OF VALVE CLEARANCE
(3S±FE)
HINT: Adjust the valve clearance while the engine is cold.
1. REMOVE CYLINDER HEAD COVER
(See step 29 on page EM±52)
± ENGINE MECHANICALEngine Tune±UpEM±11
Page 1189 of 2389

(e) Determine the replacement adjusting shim size by fol-
lowing the Formula or Charts:
wUsing a micrometer, measure the thickness of the re-
moved shim.
wCalculate the thickness of a new shim so that the valve
clearance comes within specified value.
T ..... Thickness of used shim
A ..... Measured valve clearance
N ..... Thickness of new shim
Intake N = T + (A ± 0.24 mm (0.009 in.))
Exhaust N = T + (A ± 0.33 mm (0±013 in.))
wSelect a new shim with a thickness as close as possible
to the calculated valve.
HINT: Shims are available in twenty±seven sizes of
mm (0.0020 in.), from 2.50 mm (0.0984 in.) to 3.30 mm
A 1299 in.).
(f) Install a new adjusting shim.
wPlace a new adjusting shim on the valve lifter.
wUsing SST 1Ay, press down the valve lifter and remove
SST (B).
SST 09248±55010
(g) Recheck the valve clearance. wRemove the adjusting shim with a small screwdriv-
er and magnetic finger.
4. REINSTALL CYLINDER HEAD COVER
(See step 5 on page EM±70)
± ENGINE MECHANICALEngine Tune±UpEM±12
Page 1190 of 2389
Intake valve clearance (Cold):
0.19 ± 0.29 mm (0.007 ± 0.011 in.)
EXAMPLE: The 2.800 mm 10.1102 in.) shim is installed
and the measured clearance is 0.450 mm (0.0177 in.).
Replace the 2.800 mm (0.1102 in.) shim with a No. 22
shim.
Adjusting Shim Selection Using Chart
INTAKE
Measured
clearance
(mm)
New shim thickness
Thickness
ThicknessShim
No.mm (in.)
Shim
No.
± ENGINE MECHANICALEngine Tune±UpEM±13
Page 1191 of 2389
Exhaust valve clearance:
0.28 ± 0.38 mm (0.011 ± 0.015 in.)
EXAMPLE: The 2.800 mm (0.1102 in.) shim is installed
and the measured clearance is 0.450 mm (0.0177 in.).
Replace the 2.800 mm (0.1102 in.) shim with a No. 18
shim.
Adjusting Shim Selection Using Chart
EXHAUST
Installed shim thickness
Measured
clearance
(mm)
New shim thickness
Shim
No. Thickness Thickness Shim
No.mm (in.)
± ENGINE MECHANICALEngine Tune±UpEM±14
Page 1192 of 2389

4. ADJUST VALVE CLEARANCE
(a) Check only those valves indicated in the figure.
wUsing a feeler gauge, measure the clearance between the
valve lifter and camshaft.
wRecord the valve clearance measurements which are out of
specification. They will be used later to determine the re-
quired replacement adjusting shim.
Valve clearance (Cold):
Intake 0.13 ± 0:23 mm (0.005 ± 0.009 in.)
Exhaust 0.27 ± 0.37 mm (0.011 ± 0.015 in.)
(b) Turn the crankshaft 2/3 of a revolution (240°), and check only
the valves indicated in the figure.
Measure the valve clearance.
(See procedure step W)
ADJUSTMENT OF VALVE CLEARANCE
(2VZ±FE)
HINT: Adjust the valve clearance while the engine is cold.
1. REMOVE AIR INTAKE CHAMBER
(See steps 1 to 21 on page FI±76 and 77)
2. REMOVE CYLINDER HEAD COVERS
(See step 32 on page EM±80)
3. SET NO.1 CYLINDER TO TDCI COMPRESSION
(a) Turn the crankshaft pulley, and align its groove with the tim-
ing mark º0º of the No.1 timing belt cover.
(b) Check that the valve lifters on the No. 1 (IN) are loose
and valve lifters on the No.1 (EX) are tight.
If not, turn the crankshaft one revolution (360
°) and align the
mark as above.
(c) Turn the crankshaft a further 2I3 of a revolution
(240°), and check only the valves indicated in the fig-
ure.
Measure the valve clearance.
(See procedure step (a))
± ENGINE MECHANICALEngine Tune±UpEM±15