TOYOTA PREVIA 91-97 REPAIR MANUAL

GENERAL INFORMATION AND MAINTENANCE 1-33

a. Tighten the bolts to the following specifications:

Service hole cover bolts—10 ft. Ibs. (14 Nm)

Jack holder—10ft. Ibs. (14 Nm)

RH seat leg—29 ft. Ibs. (39 Nm)

RH seat—29 ft. Ibs. (39 Nm)

RH seat belt-to-floor pan—31 ft. Ibs. (42 Nm)

INSPECTIONS GAPPING

> See Figure 89

All Toyota Previas are equipped from the factory with platinum tipped

plugs. Platinum tipped plugs should always be used on your vehicle and

A normally worn

spark plug should

have light tan or

gray deposits on the

firing tip.

This spark plug has

been left in the

engine too long, as

evidenced by the

extreme gap- Plugs

with such an extreme

gap can cause mis-

firing and stumbling

accompanied by a

noticeable lack of

power.

A physically dam-

aged spark plug may

be evidence of

severe detonation in

that cylinder. Watch

that cylinder care-

fully between ser-

vices, as a contin-

ued detonation will

not only damage the

plug, but could also

damage the engine.

Fig. 89 Inspect the spark plugs to determine engine running conditions

A carbon fouled

plug, identified by

soft, sooty, black

deposits, may indi-

cate an improperly

tuned vehicle. Check

the air cleaner, igni-

tion components and

engine control sys-

tem.

An oil fouled spark

plug indicates an

engine with worn

poston rings and/or

bad valve seals

allowing excessive

oil to enter the

chamber.

A bridged or almost

bridged spark plug,

identified by a build-

up between the elec-

trodes caused by

excessive carbon or

oil build-up on the

plug.