Chevrolet Cobalt Service & Repair Manual: Engine No Start
| A visual inspection must always
be performed to confirm the presence of aftermarket components, potential
collision damage, or areas of concern. |
| Caution: The fuel system is
under constant pressure, even with the key off. Before testing or servicing
fuel system relive fuel system pressure. |
| Warning: Gasoline is toxic
and highly flammable. When used, explosive/highly flammable vapor-air mixtures
may be formed. Keep away from sources of ignition. |
| Prior to no start diagnosis verify
that there are no fluid leaks or abnormal odors. |
| 1. |
Inspect that vehicle is not immobilized
due to a anti-theft system. |
| 2. |
Inspect for aftermarket components,
such as a remote start or alarm. |
| 3. |
Verify battery is at full state of
charge. Inspect battery condition and charge batteries, as required. |
| 4. |
If vehicle does not crank over when
ignition is cycled to start, perform starter diagnostics. |
| 5. |
Inspect for proper fuel level and quality. |
| 6. |
Verify fuel pump operation and vehicle
has proper fuel pressure. Inspect that fuel inertia switch has not
been tripped. |
| 7. |
Inspect fuses and fusible links. |
| 8. |
Connect a suitably programmed scan
tool and perform OBDII diagnostic test functions. Verify no network
concerns are present. |
| 9. |
Retrieve and record diagnostic trouble
codes (DTC's) |
| 10. |
Follow appropriate DTC chart for codes
retrieved. If no DTC's are retrieved perform following: |
| |
a. |
Inspect for fuel leaks around injectors. |
| |
b. |
Inspect spark plugs and wires, as required. |
| |
c. |
Inspect condition and wiring of crankshaft
and camshaft sensors. |
| |
d. |
Inspect for disconnected electrical
connectors and vacuum hoses. |
| |
e. |
Inspect manifold absolute pressure
(MAP) and manifold air flow (MAF) sensors and circuits. |
| |
f. |
Inspect idle air control motor and
circuits. |
| |
g. |
Inspect for a plugged air intake system. |
| |
h. |
Inspect for exhaust restrictions. |
| |
i. |
Inspect intake manifold air temp sensor
and circuits. |
| |
j. |
Inspect ignition and coil circuits. |
| |
k. |
Inspect throttle position sensor and
circuits. |
| |
l. |
Inspect exhaust gas recirculation system. |
| |
m. |
Inspect engine timing belt or chain. |
|
Removal
1.
Remove air cleaner assembly.
2.
Support engine with suitable wooden
block and suitable floor jack positioned below oil pan.
...
Refer to Fig. 1
when performing the following procedure.
1.
Place a collecting pan underneath the
oil filter.
2.
Use too ...
See also:
Chevrolet Cobalt Owners Manual. Running the Vehicle While Parked
It is better not to park with the engine running. But if you
ever have to, here are some things to know.
WARNING:
Idling a vehicle in an enclosed area with poor
ventilation is dangerous. Engine exhaust may
enter the vehicle. Engine exhaust contains
Carbon Monoxide (CO) which cannot be seen
or ...
Engine Mount, Replace
Engine Oil Filter Adapter R&R