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ENGINE DOES NOT START (continued)
Possible Problem
Cold Start Valve
Thermo-Time
Switch
Auxiliary Air
Device
1. Connect a pressure gauge to the tee found on the
driver's side of the fuel rail. Disconnect the wire from
terminal 1 of the ignition coil. Operate starter briefly to
build up fuel pressure. Disconnect electrical plug to the
cold start valve and apply 12 volts to the pin 45 and
ground to pin 46 of the cold start valve. The pressure
gauge should drop slowly indicating the valve is
(1)
opening.
2. An alternate method for verifying the operation of the
cold start valve would be to remove it from the manifold
and operate the starter and allow the fuel to spray into
a container. It should spray for a maximum of 20
seconds. In order to accomplish this the temperature
0
must be below 50
F or the thermo-time switch must be
disconnected and voltage applied to pin 45 with pin 46
grounded.
3. Verify that there is continuity between pin 45 of the
Cold Start Valve and pin G of the thermo-time switch,
and pin 46 of the Cold Start Valve and pin W of the
thermo-time switch.]
4. Measure resistance of coil in start valve – 4 ohms.
1. Remove the connector from the cold start valve.
Connect an ohmmeter between both contacts of the
connector. The engine temperature should be below
0
95
F. The measurement should indicate continuity (0
ohms) with a cold engine. At engine temperatures
0
above 95
F, the ohmmeter should indicate open.
1. Remove the auxiliary air device and connect an
ohmmeter to the contacts of the device. Reading
should indicate 30 ohms.
2. Inspect the valve in the device and determine that is
wide open when in a cold condition. Apply 12 volts to
the auxiliary air device and allow the heater unit to
function. As the unit heats up, the valve should slowly
close.
Procedure
10
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