Fast Idle Thermo Valve - Acura Integra 1998 Service Manual

ldle Control System
Fast ldle Thermo Valve (A/T model onlyl
Fast ldle I nermo valve (A/ | mooel
Description
To prevent erratic running when the engine is warming
up. it is necessary to raise the idle speed. The fast idle
t h e r m o v a l v e i s c o n t r o l l e d b y a t h e r m o w a x p l u n g e r .
When the engine is cold, the engine coolant surround-
ing the thermowax contracts the plunger, allowing addi
tional air to be bvoassed into the intake manifold so that
the engine idles taster. When the engine reaches operat-
ing temperature, the valve closes. reducing the amount
of air bypassing into the manifold.
FAST IDLE THERMO
VALVE
VALVE
wAx
Inspection
NOTE: The fast idle thermo valve is factory adiusted; it
should not be disassembled.
1. Remove the intake air duct from the throttle body.
2. Start the engine.
3.
Put your finger over the lower port in throttle body
and make sure that there is air flow with the engine
cold {engine coolant temperature below 86'F, 30"c).
LOWER
PORT
lf there is no air flow, replace the last idle thermo
valve and retest.
Start the engine. Hold the engine at 3,000 rpm with
n o l o a d ( i n P a r k o r n e u t r a l ) u n t i l t h e r a d i a t o r f a n
comes on, then let it idle.
Check that valve is completely closed. lf not, air suc-
tion can be felt at the lower port in the throttle body.
l { a n y s u c t i o n i s f e l t , t h e v a l v e i s l e a k i n g . C h e c k
e n g i n e c o o l a n t l e v e l a n d f o r a i r i n t h e e n g i n e
coolant system (see section 10). It OK, replace the
fast idle thermo valve and recheck.
5 .
{1.0 kg.m,7.2lbftl
l
1 1 - 1 1 0
l L .