Throttle Body - Honda Prelude 1993 Service Manual

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Throttle Body

The throttls body is ot the single-barrel side-dratt type.

The lower portion oJ the throttle valve is heated by en-

gine coolant which is fed from the cylinder head. The idle

adjusting screw which increases/decreases bypass 8ir

and the EvaDorative Emission {EVAP) Control Csnister

port are located on the top ot the throttle body.

IDLE ADJUSTING

CAUTION: Do not adiust the throttls stop screw,

It i3 presot at tho tactory.

1. Stan the engine and allow it to reach normal oper

ating temperature (the radiator fan comes on).

2. Disconnect the vacuum hose (to the EVAP contro

canister) trom the top of the throttle body; connec

I vacuum gauge to the throttle body.

VACUUM PUMP/GAUGE

A973X-04t -XXXXX

Allow the engine to idle and check that the gauge

indicates no vacuum.

a lf there is vacuum, check the throttle cable (see

p a g e 1 1 - 1 3 8 ) .

Check that vacuum is indicated on the gauge when

the throttle is op€ned slightly from idle.

a lf the gauge indicates no vacuum, check the

throttle body port. ll the throttle body port is

clogged, cloan it with carburetor cleaner.

Stop the engine and check that the throttle cable

operates smoothly without binding or sticking.

a It there are any abnormalities in the above steps,

- Excessive wear or play in the throttle valve

- Sticky or binding throttle lever at full close

- Clearance between throttle stop screw and

throttle lev€r at full close oosition,

' c o n t r o l

Troubleshooting