Carburetor Air Cleaner And Silencer; Heat Control Valve - Pontiac FIREBIRD 1972 Service Manual

ENGINE FUEL
6B-3
Fig. 6 8 - 3 Heat Control Valve ( 6 Cyl.)
1. Check automatic choke to see that it operates prop-
erly and that it is correctly indexed.
2. Inspect manifold heat valve to see that it operates
freely and thermostat is installed properly (6 cyl.).
3. Check for leaks in fuel line fittings, at fuel tank or at
fuel pump.
4. Check for dirty or restricted air cleaner.
5. Test for high fuel pump pressure.
6. Disassemble carburetor and check for evidence of
vacuum leaks.
7. Check float level.
CARBURETOR AIR CLEANER AND
SILENCER
A combined air cleaner-silencer and air preheater with an
oil wetted paper element is standard on all models.
An optional heavy duty dual stage air cleaner is available
on all models except the Ram Air A and F Series engines.
This air cleaner consists of a replaceable oil wetted paper
inner filter surrounded by a polyurethane foam outer fil-
ter.
The polyurethane element should be washed in solvent
and re-oiled using SAE 30 engine oil at 24,000 miles or 24
months.
NOTE:
Clean and re-oil after each occasion of
driving under severe dust conditions. Allow ex-
cess oil to drain out of filter prior to installa-
tion.
HEAT CONTROL VALVE
A thermostatically controlled valve in the outlet of the
exhaust manifold (6 cyl.) directs the passage of exhaust
~-
Fig. 6B-4 Air Cleaner Installation (A and F Series)
-
Ram Air