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 ...
Engine Mount, Replace
Engine Oil Filter Adapter R&R