1991 ACURA NSX air filter

3RD ORIFICE
CONTROL VALVE
VALVE CAP

ROLLER

VALVE SEAT
2ND EXHAUST VALVE
CPC VALVE
SECONDARY VALVE BODY
4-3 KICK-DOWN VALVE CHECK BALLS (7/32) 7
3-2 KICK-DOWN VALVE

FILTER
Replace.

Install in this direction.

4TH EXHAUST

VALVE

SERVO CONTROL

VALVE

MODULATOR VALVE
2ND ORIFICE CONTROL

VALVE

Secondary Valve Body
Disassembly/lnspection/Reassembly
Clean all parts thoroughly in solvent or carburetor cleaner, and dry with compressed air.Blow out all passages.
Replace valve body as an assembly if any parts are worn or damaged.
Check all valves for free movement. If any fail to slide freely, see Valve Body Repair on page 14-109.
Coat all parts with ATF before reassembly.
CAUTION: Do not use a magnet to remove the check balls; it may magnetize the balls.
NOTE:ProCarManuals.com

R = Replace I = Inspect After inspection, clean, adjust, repair or replace if necessary.

NOTES
SEC
&

PAGE

Severe Driving Conditions Items with an orin the chart will need service more often, if you
drive in some severe conditions.
The conditions are:
A. Repeated short distance driving.
B. Dusty conditions.
C. Severe cold weather.
D. Areas with road salt or other corrosive materials.
E. Rough or muddy roads. The services are:
Clean the air cleaner element every 7,500 miles (12,000 km) or 6 months and replace every
30,000 miles (48,000 km) or 24 months under condition B or E. Replace engine oil and oil filter every 3,750 miles (6,000 km) or 3 months under condition A
or B.
Inspect front and rear brake discs and calipers, and rear brake pads every 7,500 miles (12,000 km) or 6 months under condition A, B, D, or E.
Inspect the power steering system every 7,500 miles (12,000 km) or 6 month under condi-
tion B, C, or E. 6-23 ('91-'93)10-11
11-127
9-4
19-6
19-10
19-20
19-18
19-26
19-4
19-62
19-69
19-41
19-43
19-44
19-62
18-6
17-21 ('91-'93)
17-30 ('91-'93)
17-31 ('91-'93)

18-14,
30
ProCarManuals.com

Component Locations

Index

THROTTLE CABLEInspection/Adjustment, page 11-113

Installation, page 11-113

THROTTLE BODY

Inspection, page 11-114

Disassembly, page 11-116
AIR CLEANER

Disassembly,

page 11-112
AIR INTAKE
DUCT
FUEL PUMP

Troubleshooting, page 11-99

Testing, page 11-102
Replacement, page 11-102

FUEL FEED PIPE
FUEL CUT VALVES FUEL FILTER

Replacement, page 11-97

PRESSURE REGULATOR

Testing, page 11-95

Replacement, page 11-96

TWO-WAY VALVE

Testing, page 11-140

FUEL RETURN PIPE
FUEL FILLER CAP
CHARCOAL CANISTER
Troubleshooting, page 11-137
FUEL INJECTORS

Troubleshooting,

page 11-89

Replacement, page 11-92

FUEL PIPE
FUEL TANK

Replacement,

page 11-108

FUEL VAPOR HOSEProCarManuals.com

CHECK VALVE

AIR CHAMBER

CHAMBER VOLUME CONTROL SOLENOID VALVE

CHAMBER VOLUME CONTROL DIAPHRAGM

PCV VALVE

EGR VALVE

CONSTANT VACUUM CONTROL (CVC) VALVE

EGR CONTROL SOLENOID VALVE

CHARCOAL CANISTER

PURGE CUT-OFF SOLENOID VALVE

PURGE CONTROL DIAPHRAGM VALVE

TWO-WAY VALVE
FRONT OXYGEN (O2) SENSOR

REAR OXYGEN (O2) SENSOR

MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR

ELECTRONIC AIR CONTROL VALVE (EACV)

FAST IDLE VALVE

AIR CLEANER

FUEL INJECTOR

PRESSURE REGULATOR

FUEL FILTER

FUEL PUMP

FUEL TANK

DASHPOT DIAPHRAGM

DASHPOT CHECK VALVEProCarManuals.com