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Installation of Sensors
Install the oxygen sensor into exhaust bung. A coat of anti-seize on the oxygen sensor's threads will ease removal of the
sensor when replacement is necessary. The oxygen sensor should be torqued to 20 ft.lbs.
The intake air temperature (IAT) sensor should be located in the intake air stream. It is desirable to locate this sensor as far
from the engine throttle body as possible. The IAT sensor uses thread 1/4 NPT (National Pipe Thread). Determine where you
will locate your IAT sensor. The sensor location will vary depending on your filter and intake duct configuration. If you are us-
ing a remote air filter with a duct from the filter to the throttle body, you should install the IAT sensor in the duct near the filter.
If you are using a filter directly on the throttle body, you should install the IAT sensor in the filter. Installation of the IAT sensor
in the intake manifold is not recommended. In the intake manifold the sensor may provide false readings due to the sensor
absorbing heat from the engine/intake manifold. If you plan on welding in threads, a pipe nipple from your local hardware
may facilitate the installation. Additionally, some "snap-in" intake sensor are available in a number of configurations.
Installation of Harness
You may need to lengthen or shorten the oxygen and IAT sensor wires on the harness. It is recommended that this be done
by soldering and sealing your soldered connection with heat shrink. Standard butt connectors are not recommended. NOTE:
Do not make any repairs or modifications to the wires attached directly to the Oxygen Sensor.
1. Lay the wiring harness along the left-hand side of the intake manifold with the idle air control valve, throttle position sensor,
and engine coolant temperature sensor connectors at the front of the engine.
2. Connect the sensors mentioned above to their mating components.
3. Attach the eight fuel injector connectors.
4. Plug the MAP sensor connector into the MAP sensor, located on the left hand side of the intake manifold plenum.
5. Install the ECM connectors. Your ECM connectors on the harness can be identified by the clear or smoke colored alignment
keys - J1 - smoke, J2-clear. The outside of each connector on the ECM is labeled J1 or J2.
6. Install the coil wire assembly, part number 12097982. One end attaches to the top of the coil, the other end to the rear of
the distributor.
7. Attach the connectors from the harness to the distributor and the ignition coil.
8. Plug in the fuel pump and ignition relays.
9. Attach the knock sensor connector to the knock sensor. Use care in routing the wiring harness to the connector so that the
harness will not be damaged by heat from the exhaust system.
10. Attach the B+ lead to the big terminal at the starter. A fusible link should be added at this connection for added protection.
11. Connect the fuel pump leads. The installer must provide a wiring harness from the fuel pump to the leads provided.
12. Connect the ignition lead to the ignition switch.
13. On your harness you will notice several different grounds. The grounds must be grounded on separate studs on the engine.
Failure to use separate ground studs may result in improper engine performance or ECM failure.
14. You will also notice two tachometer outputs from the harness, tach1 is for a standard negative side of the coil driven tach.
Tach2 is for digital tachometers; this is a 0-12 V square wave output. Select and connect the proper output for your application.
15. Reconnect your battery cable.
Ramjet 350 Engine
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GM SPECIFICATIONS.
19417614
IR 13SE18
PART NO.
DATE
13SE18
Initial Release - Alin Dragoiu
7
SHEET
REVISION
45
OF
AUTH
N/A
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