Toyota Supra 1990 Manual page 342

IG-8
IGNITION SYSTEM - On-Vehicle Inspection (7M-GE)
IGOJ16
0.8
mm
(7M·GTE)
1.1
T
e;;
J
f
IGOJI71G015l
IG0152
IG0598
3. VISUALLY INSPECT SPARK PLUGS
4.
Check the spark plug for thread or insulator damage.
If abnormal, replace the plug.
Recommended spark plugs:
7M-GE ND PO 16R
NGK BCPR5EP11
7M-GTE ND P020R-P8
NGK BCPR6EP-N8
INSPECT ELECTRODE GAP
Maximum electrode gap: 7M-GE 1.3 mm (0.051 in.)
7M-GTE 1.0 mm (0.039 in.)
If the gap is greater than maximum, replace the plug.
Correct electrode gap of new plug:
7M-GE 1.1 mm (0.043 in.)
7M-GTE 0.8 mm (0.031 in)
If adjusting the gap of a new plug, bend only the base of
the ground electrode, do not touch the tip.
5. CLEAN SPARK PLUGS
If the electrode has traces of wet carbon, allow it to dry
and then clean with a spark plug cleaner.
Air pressure: Below 6 kg/cm2 (85 psi, 588 kPa)
Duration: 20 seconds or less
HINT: If there are traces of oil, remove it with gasoline
before using the spark plug cleaner.
6. INSTALL SPARK PLUGS
(a) Using a plug wrench(16mm), install and torque the
spark plugs.
Torque: 180 kg-cm (13 ft-Ib, 18 Nom)
(b) Install the high-tension cords.