Checks
| Action
|
DEFINITION: The engine cranks normally, but does not start
in a normal amount of time. The engine does eventually run or may start
but immediately dies.
|
Preliminary Checks
|
| • | Make sure the vehicle's operator is using the correct starting
procedure. |
|
sensor Checks
|
| • | Inspect the engine coolant temperature (ECT) sensor with the scan
tool. Compare the engine coolant temperature with the ambient air temperature
on a cold engine. If the coolant temperature reading is more than
5 degrees more or less than the ambient air temperature on
a cold engine, check for a high resistance in the coolant sensor
circuit. |
| • | Inspect the throttle position (TP) sensor. If a sticking throttle
shaft or binding linkage causes a high TP sensor voltage (open throttle indication),
the control module will not control the idle. While monitoring the
TP sensor voltage, the scan tool should display less than 0.85 volt
with the throttle closed. |
|
Fuel System Checks
|
| | Important: A damaged in-tank fuel pump check valve will allow the fuel in the lines
to drain back to the tank after the engine stops.
|
| • | Inspect for water contamination in the fuel. |
|
Ignition System Checks
|
| • | Inspect for the proper ignition voltage output with J 26792
. |
| • | Inspect the spark plugs for the following conditions: |
| • | Inspect for bare or shorted ignition wires. |
| • | Inspect for moisture in the distributor cap if applicable. |
| • | Inspect for loose ignition coil connections. |
| • | Inspect for loose ignition control module connections. |
| • | Inspect for a faulty control module or ignition system grounds. |
|
Engine Mechanical Checks
|
| • | Inspect for the following: |
| - | Broken or weak valve springs |
| - | Worn camshaft lobes. Refer to Engine Mechanical. |
| • | Inspect the intake and exhaust manifolds for casting flash. Refer
to Engine Mechanical. |
|
Additional Check
|
|
