1983 FIAT UNO octane

3
System type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear mounted fuel tank, mechanically-operated fuel pump,
downdraught carburettor
Air cleaner element
903 cc (45) and 1116 cc (55) engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion W121
1116 cc (60) and 1299/1301 cc (70) engines . . . . . . . . . . . . . . . . . . . . . Champion W136
Fuel tank
Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42.0 litre (9.25 gal)
Octane rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Leaded 97 RON minimum (see Supplement for use of unleaded petrol)
Fuel filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion L101
Carburettor - calibration (dimensions in mm)
Weber 32 ICEV 50/250/1
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903 cc engine
Venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Auxiliary venturi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5
Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.12
Air bleed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.70
Emulsion tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F89
Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.47
Air idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.60
Pump jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.40
Pump outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.40
Superfeed jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.80
Superfeed mixture jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.50
Fuel inlet needle valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.50
Anti-syphon device . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.00
Idle mixture adjustment hole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.50
Float setting (fuel level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10.5 to 11.0
Float setting (travel/stroke) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45.0
Fast idle (throttle valve gap) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.75 to 0.80
Accelerator pump delivery (ten strokes) . . . . . . . . . . . . . . . . . . . . . . . . . 4.0 to 5.5 cc
Chapter 3 Fuel system
For modifications, and information applicable to later models, see Supplement at end of manual
Accelerator cable - adjustment and renewal . . . . . . . . . . . . . . . . . . 17
Air cleaner - servicing, removal and refitting . . . . . . . . . . . . . . . . . . . 2
Carburettor - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Carburettor idle speed and mixture - adjustment . . . . . . . . . . . . . . . 7
Carburettor (Solex C32 DISA 12) - servicing and adjustment . . . . . . 13
Carburettor (Solex C30 - 32 CIC/1) - servicing and adjustment . . . . 15
Carburettor (Solex C32 DISA 11) - servicing and adjustment . . . . . . 10
Carburettor (Weber 30/32 DMTR 90/250) - servicing and
adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Carburettor (Weber 32 ICEV 50/250/1) - servicing and adjustment . . 9
Carburettor (Weber 32 ICEV 51/250) - servicing and adjustment . . . 12Carburettors (Weber 32 ICEE/250 and Solex C32 DISA 14) -
description and adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Carburettors - general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Choke control cable - removal and refitting . . . . . . . . . . . . . . . . . . . 18
Description and maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Economy meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Fault finding - fuel system . . . . . . . . . . . . . . . . . . . See end of Chapter
Fuel level transmitter - removal and refitting . . . . . . . . . . . . . . . . . . . 4
Fuel pump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Fuel tank - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Manifolds and exhaust system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3•1
Specifications Contents
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,
suitable for competent
DIY mechanic
Difficult,suitable for
experienced DIY
mechanicVery difficult,
suitable for expert DIY
or professional
Degrees of difficulty
54321

Weber 30/32 DMTE 12/150
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1299/1301 cc
All calibration as for the Weber 30/32 DMTE 10/150 except for the following:
Primary Secondary
Accelerator pump jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 45
Air correction jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.20 1.75
Idle jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 70
Main jet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.90 0.97
Fuel injection systems
System type:
999/1108 cc ie (from 1992) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bosch Mono-Jetronic SPi with catalyst
1301 Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bosch LE2 Jetronic MPi
1372 cc ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bosch Mono-Jetronic SPi
1372 cc Turbo ie (up to 1992) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bosch L3.1 Jetronic MPi
1372 cc Turbo ie (from 1992) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bosch L3.2 Jetronic MPi with catalyst
Fuel pump:
All fuel injection models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electric
Fuel pressure:
999/1108/1372 cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 to 1.10 bars
1301 cc Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 bars
1372 cc Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.0 bars maximum
Fuel octane rating:
Without catalyst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 RON minimum (unleaded or leaded)
With catalyst . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 RON minimum (unleaded only)
Idle speed:
999/1108 cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 ± 50 rpm
1301 cc Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 ± 50 rpm
1372 cc ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 850 ± 50 rpm
1372 cc Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 825 ± 25 rpm
Exhaust gas CO at idle:
999/1108 cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 0.35%
1301 cc Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 to 1.5%
1372 cc Turbo ie . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 to 1.8%
Torque wrench settingsNm lbf ft
Coolant pipe bolt to turbocharger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 18
Coolant pipe union nut to turbocharger . . . . . . . . . . . . . . . . . . . . . . . . . 38 28
Exhaust bracket nuts and bolts (999/1108 cc) . . . . . . . . . . . . . . . . . . . . 23 17
Exhaust manifold flange nut (1372 cc models) . . . . . . . . . . . . . . . . . . . . 18 13
Exhaust manifold to crankcase bracket (1372 cc) . . . . . . . . . . . . . . . . . 25 18
Exhaust manifold to cylinder head (1372 cc) . . . . . . . . . . . . . . . . . . . . . 25 18
Exhaust pipe flange-to-manifold nuts (999/1108 cc) . . . . . . . . . . . . . . . 18 13
Fuel pump mounting bolts (999/1108 cc) . . . . . . . . . . . . . . . . . . . . . . . . 8 6
Fuel pump unions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 11
Fuel pressure regulator nut . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 35
Inlet and exhaust manifold to cylinder head nuts (999/1108 cc) . . . . . . 27 20
Rear exhaust pipe/silencer mounting bracket nut . . . . . . . . . . . . . . . . . 24 18
Turbocharger-to-exhaust manifold-and-cylinder head nut . . . . . . . . . . 28 21
Ignition system
“Breakerless” (999, 1108, 1116, 1299/1301 cc)
General
System type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Magnetic impulse generator electronic
Spark plug type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion RC9YCC or RC9YC
Spark plug electrode gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8 mm
HT lead type (999 and 1108 cc) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Champion LS-20
Component testing values
Magnetic impulse generator resistance:
Models with Marelli distributors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 758 to 872 ohms
Models with the Ducellier distributor . . . . . . . . . . . . . . . . . . . . . . . . . 171 to 209 ohms
Ignition coil resistance at 20ºC (68ºF):
Models with BA506A coil:
Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.756 to 0.924 ohms
Secondary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3330 to 4070 ohms
Models with BA506D coil:
Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.666 to 0.814 ohms
Secondary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2970 to 3630 ohms
13•12 Supplement: Revisions and information on later models

Fault finding - turbocharger system
Supplement: Revisions and information on later models 13•85
13
Noise or vibration
m mWorn shaft bearings
m mLack of lubrication
m mInlet or exhaust manifold leaking
m mOut-of-balance impeller shaft
Engine “pinking”
m
mHigh boost pressure, caused by faulty wastegate valve
m mFuel octane rating too low
m mFaulty TDC sensor (ignition advanced)
m mIncorrect spark plugs or plug gaps, or spark plugs worn
Indicated boost pressure too high
m
mFaulty wastegate valve
m mIce forming in exhaust pipe (during very cold weather)
Power loss/indicated boost pressure too low
m
mTurbocharger leaking, or leak at turbocharger mounting
m mIncorrectly adjusted wastegate valve/wastegate valve not closing
m mBlocked exhaust pipe
m mClogged air cleaner element
m mFaulty TDC sensor (ignition retarded)
m mTurbo/intercooler connecting hose leaking
Oil leaks from shaft oil seals, with blue exhaust
fumes
m mOil return pipe blocked
m mAir cleaner element clogged
m mWorn oil seals
10 Ignition system
General
1The ignition systems dealt with in this
Section are all fully electronic and are referred
to individually according to type as the
“breakerless”, Microplex and Digiplex 2
system. The Microplex system is used on the
1301 and 1372 cc Turbo ie engines, the
Digiplex 2 on the 1372 cc ie engine and the
“breakerless” system on all other models.
Ignition timing
(all later models)#
2The ignition timing check on all systems
covered in this Section is made using a
stroboscope, connected up in accordance with
the manufacturer’s instructions and pointed at
one of the two positions given below (photos).
a) The timing marks on the crankshaft pulley
and the timing cover. The right-hand
underwing shield will need to be
detached and removed to allow access to
view these marks (see photos 7B.27 and
7B.30B in this Chapter).
b) The timing marks on the flywheel and the
clutch housing. The rubber plug will need
to be extracted for access to these marks.
3A dwell angle check is not possible on any
of these systems.
4When making the stroboscopic ignition
timing check it is necessary to disconnect the
vacuum hose from the distributor or inlet
manifold to module (as applicable) and plug it.
The engine must be at its normal operating
temperature and running at the normal
specified idle speed when making the check.
Refer to the appropriate part of the Specifica-
tions at the start of this Chapter for the idle
speed and ignition settings.
Breakerless ignition system -
description
5On 903 cc engines, the distributor is driven
from an extension of the oil pump driveshaft
which is geared to the camshaft.
10.2B Flywheel timing marks
(1372 cc ie engine)10.2A Flywheel timing marks
(999 cc engine)
Fig. 13.70 Breakerless ignition system - 999 and 1108 cc engines (Sec 10)
1 Battery
2 Ignition switch
3 Ignition coil
4 Coil HT lead5 Distributor
6 ECU
7 LT cables
8 Vacuum advance unit9 Spark plug HT leads
10 Spark plugs
11 Vacuum hose