1991 ACURA NSX fuel

General Info
Specifications
Maintenance
Engine
Cooling
Fuel and Emissions
’91’92 Models
’93’94 Models
’95’96 Models
*TransaxleSuspension
*Brakes (Including ABS)
*Body
*Heating, Ventilation and
Air Conditioning
*Body Electrical
*Engine Electrical
*SRS
1991-96 NSX Main Menu
As sections w/ * include SRS components,
special precautions are required when servicing.
Steering
’91’94 Models
’95’96 Models
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Fuel an d Emissio n — Sectio n 1 1
Clutc h — Sectio n 1 2
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Engine Removal/Installatio n
Removal
5. Disconnec t th e fa n moto r connector , the n remov e
the engin e roo m fa n assembly .
ENGINE ROO MFAN
FAN MOTO R
CONNECTO R
6 x 1. 0 m m10 N- m (1. 0 kg-m , 7 Ib-ft )
6. Remov e th e rea r tri m panel s behin d th e passenger' s
seat , the n disconnec t fou r connector s fro m th e
engin e contro l modul e (ECM ) an d thre e connector s
fro m th e floo r wir e harness .
ENGINE WIR E
HARNES S
ECM
FLOO R WIR E
HARNES S
CORROSIO N RESISTAN T BOL T
7. Disconnec t th e spar k plu g voltag e detectio n modul e
connectors , ground cable an d engin e wir e harnes s
clamps .
SPARK PLU G VOLTAG EDETECTIO N MODUL ECONNECTOR S
GROUND
CABLE
ENGIN E WIR E
HARNES S CLAMP S
8. Disconnec t th e fue l pum p resisto r connector , injec -
to r resisto r connecto r an d groun d cable .
FUEL PUM P RESISTO R
CONNECTO R
GROUND CABL E
INJECTO R RESISTO R
CONNECTO R
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9. Relieve fuel pressure by loosening the service bolt
on the fuel filter about one turn (see section 11).
Do not smoke while working on the
fuel
system.
Keep open flame away from work
area. Drain fuel only into an approved container.
10. Remove the fuel feed pipe and fuel return hose.
11. Remove the wire harness cover, then remove the fuel pipe clamp.

22 N·m
(2.2 kg-m,
16 Ib-ft)

WIRE HARNESS

COVER
6 x 1.0 mm

12 N·m
(1.2 kg-m,

9 lb-ft)

FUEL FEED
PIPE

WASHERS
Replace.

FUEL RETURN

HOSE

12. Remove the brake booster vacuum hose and evapo- rative emission (EVAP) control canister hose.

BRAKE BOOSTER

VACUUM HOSE

EVAP CONTROL

CANISTER HOSE
13. Remove the expansion tank cap.

14. Raise the hoist to full height.
15. Drain the engine coolant (see page
10-5).
Loosen the drain plug from the radiator lower
tank. Remove two drain bolls from the water pipes.
Reinstall the drain bolts with new washers.
Loosen the front and rear engine drain bolts to
drain engine coolant from the cylinder heads.
Connect rubber hoses to the drain bolts.
16. Drain the transmission oil/fluid. Reinstall the drain plug with a new washer.
17. Drain the engine oil. Reinstall the drain plug with a
new washer.

18. Lower the hoist, then remove the air cleaner hous-

ing (see page 6-25 ('91-'93 Mode ls),or('95-'96 Models).

19. Disconnect two hoses, then remove the expansion

tank.

6 x 1.0 mm

10 N·m
11.0 kg-m,

7 lb-ft)

EXPANSION

TANK

WATER BYPASS

HOSES
(cont'd)ProCarManuals.com

5. Install the side engine mount, then tighten the bolts
in the numbered sequence as shown ( - ),

12 x
1.26
mm

73 N·m
(7.3 kg-m,
53 Ib-ft)

Replace.
12 x
1.25
mm

95 N·m
(9.5 kg-m,
69 Ib-ft)

SIDE ENGINE

MOUNT

6. Tighten the transmission mount mounting bolt.

MOUNTING BOLT
12 x
1.25
mm

95 N·m (9.5 kg-m, 69 Ib-ft)
7. Tighten the rear mount mounting bolt.
MOUNTING BOLT

12 x
1.25
mm

77 N·m (7.7 kg-m, 56 Ib-ft)
Replace.

Check that the spring clip on the end of each
driveshaft clicks into place.
CAUTION: Use new spring clips.
Bleed air from the cooling system (see page 10-5).
Bleed air from the brake lines {see section 19).
Check the clutch pedal free play (see section 12).

Adjust the clutch guide assemblies when disas-

sembling clutch (see section 12).

Check that the transmission shifts into gear

smoothly.

Adjust the alternator belt (see section 23).
Adjust the A/C compressor belt (see section 22).
Clean battery posts and cable terminals with
sandpaper, assemble, then apply grease to pre-
vent corrosion.
Inspect for fuel leakage (see section 11). After assembling the fuel line parts, turn on
the ignition switch (do not operate the starter) so that the fuel pump operates for approxi-
mately two seconds and the fuel line pressu-
rizes. Repeat this operation two or three times
and check for fuel leakage at any point in the

fuel line.

Check and adjust wheel alignment (see section 18).

Refill the engine with engine oil (see page 8-4 ('91-'92
Models), ('93-Model),or ('94-'96 Models).

Refill the transmission with oil/fluid (see section

13 or
14).ProCarManuals.com

10. Remove the engine cover stay from the strut brace,
then set the engine cover stay between the engine
cover and rear hatch latch (NSX-T open top),
CAUTION: Use a shop tower to avoid damaging

painted surfaces.

SHOP

TOWEL

11. Relieve fuel pressure by loosening the service bolt on the fuel filter about one turn (see section 11).
Do not smok* while working on fuel
system; Keep open flame or spark away from work

area. Drain fue1 only into an approved container.

12. Remove the fuel feed pipe and fuel return hose (see page 5-5 ('91-'93) or ('94-'96).

13. Remove the evaporative emission (EVAP) control
canister hose and brake booster vacuum hose (see
page 5-5 ('91-'93) or ('94-'96).
14. Disconnect the breather pipe and vacuum hose, then remove the air cleaner housing.

6 x 1.0 mm

10 N·m (1.0 kg-m, 7 lb-ftl

AIR CLEANER
HOUSING

BREATHER

PIPE

: CORROSION RESISTANT BOLT
15. Remove the Hoses, then remove the expansion tank
(see page 5-5 ('91-'93) or ('94-'96).
16. Removel the radiator hoses and heater hose (see
page 5-6 ('91-'93) or ('94-'96).

17. Disconnect the two connectors, then remove the
control box (see page 5-6 ('91-'93) or ('94-'96).

18. Remove the intake manifold plate and top cover.

INTAKE MANIFOLD

PLATE
6 x
1.0mm

12 N·m (12kg-m,

9 lb-ft)

TOP COVER

19. Remove the fuel injector covers.
6 x 1.0 mm
12 N·m (1-2 kg-m, 9 lb-ft)

FUEL INJECTOR

COVER

(cont'd)

ENGINE

COVER

STAYProCarManuals.com

FUEL TAN K EVAPORATIV E EMISSIO N(EVAP) VALV E
EVAPORATIV E EMISSIO N(EVAP) TW O WA Y VALV ETesting , pag e 11-17 3
FUEL FIL L CA P
EVAPORATIV E EMISSIO N(EVAP) CONTRO L CANISTE R FUE
L PUM P
Testing , pag e 11-14 2
Replacement , pag e 11-14 2
FUEL FEE D PIP E
FUE L FILTE R
Replacement , pag e 11-13 8
FUEL PRESSUR E REGULATO R
Testing , pag e 11-13 7
Replacement , pag e 11-13 8
FUEL RETUR N PIP E
FUE L
VAPO R HOS E FUE
L INJECTOR S
Replacement , pag e 11-13 4
FUE L RAI L
FUE L TAN K
Replacement , pag e 11-14 7
FUE L PUM P RELA Y
Troubleshooting , pag e 11-13 9
For Troubleshooting of DTC related components, see chart on page 11-52.
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System Descriptio n
Vacuum Connection s
CONTROLBOXpag e 11- 8EVA P PURG E FLO W
SWITC H
INTAKEAIRBYPAS S(IAB)DIAPHRAG M
FUEL PRESSUR E
REGULATO R EVA
P
PURG E CONTRO L
DIAPHRAG M VALV E
EVA P CONTRO L
CANISTE R
FRON T O F
VEHICL E
EG
R VALV E
LIF T SENSO RT
o EVA P TWO-WA Y
VALVE
EGR VALV E
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