1998 ACURA INTEGRA valve

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Intake Air System
System DescriptioSystem uescnpllon
The system supplies air for all engine needs. lt consists of the intake air pipe. Air Cleaner (ACL), intake air duct, Throttle
Body (TB), ldle Air Control (lAC) Valve, fast idle thermo valve (A,/T model only), and intake manifold.
A resonator in the intake air pipe provides additional silencing as air is drawn into the system.
B18Cl engine lB18Bl, B18C5 enginos does not havs the IAB systeml:
IABCONTROLsollNolDVALVE
VARIOUSSENSORS
IABCONTROLDIAPHRAGM
IiITAKEAIR PIPE
INTAKE MANIFOLDINTA|(EAIRDUCT
RESONATOR

l-
Intake Air System
LOCKNUT
DEFLECTION10-12mmBIA- 112in.l
lf deflection is not within specs, loosen the locknut,
turn the adjusting nut until the deflection is as spec-
ified, then retighten the locknut.
With the cable properly adiusted, check the throttle
valve to be sure it opens fully when you push the
accelerator pedal to the floor. Also check the throt-
tle valve to be sure it returns to the idle position
whenever you release the accelerator pedal.
Throttle Cable IB18B1, 818C5 engines]
Inspection/Adiustment
1. Start the engine. Hold the engine at 3,000 rpm wirh
no load (in Park or neutral) until the radiator tan
comes on, then let it idle.
2. Check that the throttle cable operates smoothly wilh
no binding or sticking. Repair as necessary.
3. Check cable free play at the throttle linkage. Cable
deflection should be 10 - 12 mm (3/8 - 'l12 in.l
ADJUSTINGNUT
t
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qr
ll1 1-130
!!
TING NUT
\lnstallation
1. Open the throttle valve fully, then install the throttle
cable in the throttle linkage and install the cable
housing in the cable bracket.
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in Park or neutral) until the radiator fan
comes on, then let it idle.
INNER CABLE
Hold the cable sheath, removing all slack from the
caote.
Turn the adjusting nut until it is 3 mm {1/8 jn.) away
from the cable bracket.
Tighten the locknut, The cable deflection should now
be 10 - '12 mm (3/8 - 'll2 in.). lf not, see Inspection/
Adjustment.
3 mm 10.12 inl
u
4.
AD
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JUSLOCKNUT9.8 N.m(1.0 kgt.m,7,2lbl.ttl
CABI.E
CABI,E BMCKET

't.
Inspsction/Adiustmsnt
Stan the engine. Hold the engine at 3,000 rpm with
no load in neutral until the radiator fan comes on,
then let it idle.
Check that the throttle cable operates smoothly with
no binding or sticking. Repair as necessary.
Check cable free play at the throttle linkage. Cable
deflection should be 10 - 12 mm (3/8 - 1/2 in.)
DEFTECTION10- 12 mmBIA-112in.l
lf deflection is not within specs, loosen the iocknut.
turn the adjusting nut until the deflection is as spec-
ified, then retighten the locknut.
With the cable properly adjusted, check the throttle
valve to be sure it opens fully when you push the
accelerator pedal to the floor. Also check the throt-
tle valve to be sure it returns to the idle position
whenever you release the accelerator pedal.
CABLE BBACKET
lnstallation
Open the throttle valve fully, then install the throttle
cable in the throttle linkage and install the cable
housing in the cable bracket.
Stan the engine. Hold the engine at 3,000 rpm with
no load in neutral until the radiator fan comes on,
then let it idle.
l.
3.
5.
CABLEBRACKETTHROTTLE LINK
ADJUSTING NUT
With part A of the cable bracket. support the cable
sheath so that there is no inner wire tree plav. Turn
the adjusting nut until it touches part A, leaving a
gap between the locknut and adjusting nut.
Move the cable sheath to oart B of the cable bracket
that so the bracket slides into the gap between the
locknut and adjusting nut. Tighten the locknut.
LOCKNUT9.8 N.m 11.0 kgf.m, PART 87.2lbf.frl(Lockod by bracketl
CABLESHEATH
NO GAPINNERCABLE
ADJUSTINGNUT
The cable deflection should now be 10 - 12 mm(318 - 112 in.l. lf not. see Inspection/Adjustment.
ADJUSTING NUT
1 1-131

In
Intake Air System
Throttle Body
$;
Description
The throttle body is of the single barrel side-draft type.
The lower portion of the throttle valve is heated by
engine coolant from the cylinder head. The idle adjusting
screw which increases/decreases bypass air is located on
the top ot the thronle body.
IDLE ADJUSTINGSCREW
THROTTLESTOP SCREW(Non-adjustable)
FAST IDLE
| | .o clearance. THRoTTLE SToP scREw
{ | | _ .lDonotadiust)
| | y:::::::T,"9":::.'"Tl::f ,::i1::"1" fllyll-'n"
VALVE {A/T model onlv}
Inspection
1. Start the engine. Hold the engine at 3,000 rpm with
no load {in Park or neutral) until the radiator fan
comes on, then let it idle.
2. Stop the engine, and check that the throttle cable
operates smoothly without binding or sticking.
. lf the throttle body pon is clogged, clean it with
carburetor cleaner.
. lf there are any abnormalities in the above steps,
check for:
Excessive wear or play in the throttle valve shaft.- Sticky or binding throttle lever at full close posi-
tion.- Clearance between throttle stop screw and throt-
tle lever at fullclose position.
81881, Bl8Cl engines:
There should beno clearance.
818C5 engine:THROTTLE LINK
There should be
throttle valve shaft or if the shaft is binding or sticking.
glL-

Disassembly
NOTE:
. The throttle stoD screw is non-adiustable.
. After reassembly, adjust the th rottle ca ble (page 11-130, 131),andA/Tthrottlecontrol cable (section l4)Ior cars with A/T.. The TP sensor is not removable.
IOLE ADJUSTINGSCREW
FAST IDLETHERMOVALVE {A/T model onlylInspectaon, page 1 1-l 10
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12.2 kgf.m, 16 lbf.ft)
1 1-133

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Intake Air System
Intake Air Bypass (lAB) Control System [818C1 enginel
Descriplion
Two air intake oaths are erovided in the intake manifold to allow the selection of the intake path most favofable for a given
engine speed.
Satjsfactory power performance is achieved by closing and opening the intake air bypass (lAB) control valves. High torque
at low RpM is acheived when the valves are closed, whereas high power at high RPM is achieved by when the valves are
opened.
IAB CONTROLVALVES
ECM
illf1l
i 11-134
--_
CHECI( VALVE

Troublsshooting
IAB CONTROLDIAPHRAGM
Inapection ot IAB Control System.
Chack {or vacuum at idle:1. Stan the engine and allow itto idle.2. Romove the vacuum hose fromthe IAB control diaphragm andconnect vacuum gauge to thenose,
Check to. vacuum at IAB vacuumttnl;Remove No. 13 vacuum hose fromthe IAB vacuum tank, then checkfor vacuum at the IAB vacuumtank.
Repair th€ blockage or vacuuml6ak between the IAB vacuumtenk 6nd the intake manifold.
Check for an open in the wirellAB SOL line):1. Turn the ignition switch OFF.2. Disconnect the IAB controlsolenoid valve 2P connector.3. Turn the ignition switch ON (ll).4. Measure vohage between theIAB control solenoid valve 2Pconnector terminals No, 1 andNo.2.
ls there battery voltage?
Chack for rn op€n or 3hort in thewire (lAB SOL line):Measuro voltage between bodyground and the IAB controlsolenoid valve 2P connector termi-nai No. 1.
IAB SOL(RED/BLUI
rt./; Ir I-TD,2F-' Y\.\/ | ]IGND(BLKI
Wire side ot female terminals
IAB CONTROL SOLENOIDVALVE 2P CONNECTOR {C134)
IAB SOLIRED/BLU)
(cont'd)
11-135
(To page I'l-136)(To page 11.136)

I
lntake
lntake
Air System
Air Bypass (lABl ControlSystem tB18C1 enginel (cont'd)
(From page 11i135)(From page 11 135)
IAB CONTROL SOLENOID
VALVE 2P CONNECTOR (C13ir)
'._r taB sol-H, IRED/ALUI// 1 \-'lf---:----l /A\
\2Y
Wire side o{ female terminals
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Check {or vacuum at 6,000 rpm:
1, Raise engane speed to above
6,000 rpm.2. Check for vacuum at the
vacuum hose,
Disconnect the IAB control solenoidvalve 2P connector.ls there vacuum?
Substitute a known-good ECM
and recheck. lf symptom goes
away, replace the original ECM.IAB control svstom is OK.
Check lor a shon in the wire (lAB
SOL line):1. Turn the ignition switch OFF.2. Disconnect the ECM connector
A (32P).
3. Check for continuity betweenbody ground and the IAB con'
trol solenoid valve 2P connec-
torterminalNo. 1.
ls there battery voltage?
Repair open in the wire betwaonECM lA26) and the IAB controlsolenoid valve 2P connectoa.
Check tor an open in the wiro
{GND line)r1. Turn the ignition switch OFF.2. Check for continuity betweenbody ground and the IAB con-
trol solenoid valve 2P connector terminal No.2.
Repair open in the wire betweenthe IAB control solenoid valve 2Pconnector and G101.
Subdhnte a known-good ECM andrecheck. ll symptom goes away,r€place the original ECM.
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