Camaro RS V8-305 5.0L VIN E TBI (1990)
4.
Select "TPS" voltage display on the SCAN tool, and adjust the TPS to 0.54 +/- 0.08 volts.
5.
Select "Field Service Mode" on the SCAN tool (refer to SCAN tool instructions). This will cause the IAC valve pintle to seat in the throttle body
(closing the air passage). Wait at least 45 seconds, disconnect IAC valve connector, then exit "Field Service Mode."
6.
Disconnect the distributor set-timing connector, see COMPONENT LOCATIONS/ENGINE COMPARTMENT COMPONENTS.
NOTE: The distributor set-timing connector must be disconnected to fix spark advance at base timing. This eliminates the possibility of changes
in engine speed due to changes in timing.
7.
Place the transmission in PARK (A/T) or NEUTRAL (M/T). Start the engine and idle until it reaches normal operating temperature, and
CLOSED LOOP operation as read on the SCAN tool.
^
It may be necessary to hold the throttle open slightly to maintain idle.
8.
Select ENGINE RPM on the SCAN tool, and read the engine speed:
^
Engine should be at normal operating temperature and in CLOSED LOOP.
^
Accessories (A/C, rear defog, etc.), and engine cooling fan should be OFF.
^
Make sure the throttle and cruise control cables do not hold the throttle open.
^
Idle speed should be 425 +/- 25 rpm.
9.
Adjust the minimum idle speed if necessary.
10.
Turn ignition OFF.
11.
Connect the IAC valve electrical connector and distributor set timing connector.
12.
Turn the ignition to the ON position, and recheck TPS voltage on the SCAN tool. Adjust if necessary, to obtain 0.54 +/- 0.08 volts.
^
Tighten TPS attaching screws to 2.0 Nm (18 lb.in). Make sure adjustment did not change after tightening screws.
13.
Reset IAC valve position:
a.
Depress the accelerator pedal slightly.
b.
Start and run the engine for five seconds.
c.
Turn the ignition OFF for ten seconds.
d.
Restart the engine and check for proper idle operation.
14.
Disconnect the SCAN tool.
15.
Remove the block from under the drive wheels.
