Larry’s
Electric 1-618-282-2852
GM Throttle body Injection Harness installation instructions
Thank you for your purchase from Larry’s
Electric. To help aid in a successful
installation, I have included these instructions. Please take the time to familiarize your self
with all the components and instructions before installing. If these instructions are not followed very
carefully it may result in severe damage or harm to your self and the vehicle. In addition to these instructions you must
have at least a general idea of how fuel injection works and be familiar with
all of its components.
Things that you need
to start.
- A TBI
unit, complete with idle air motor and throttle position sensor, and
intake manifold.
- GM #1227747
ECM with the correct memcal and
prom chip from either a V6, V8, depending on your engine size.
- GM MAP
Sensor # 16137039
- O2
sensor (oxygen sensor) mounted in the exhaust with in 18 inches of the
exhaust port. Heated O2 sensors may
also be used (especially with headers) and need to be mounted as close as
possible to the exhaust port.
- GM
Knock sensor #10456126
- 3/8 or
larger fuel supply line from the tank (Fuel injection line 90psi min
only), and a 5/16 or larger return line to the tank. The return line must end at least ˝ in
from the bottom of the fuel tank to prevent vapor and static electricity
build up.
- Electric
fuel pump capable of delivering 20 PSI under all driving conditions and a
fuel filter designed for that amount of pressure.
- Injectors
for your size engine. Take note
from what engine your throttle body came from.
- Distributor
from any TBI or TPI engine (Small cap) Remote coil mount
In addition to standard mechanics tools you need a 12 volt test light or meter and a digital non-loading meter.
INSTALLATION:
To begin, locate and drill a 2 inch hole through the fire wall for the main loom to the ECM. Just behind the distributor is an ideal location.
Working from inside the vehicle, start feeding the harness through the fire wall into the engine compartment. Feed the harness until the rubber grommet can be inserted into the fire wall.
Route the injector wires along the passenger side intake manifold. The pink/blue wires connect to the injector on cylinders 1,3,5,7 (drivers side). The pink/green wires connect to the injector on cylinders 2,4,6,8 (passenger side).
Connect the distributor plug (white, purple, tan, and red wires).
Connect the coolant temp sensor plug at the front of the manifold (yellow and black wires).
Connect the black/white wire to a clean solid bolt on the manifold.
Connect the throttle position sensor (black, blue, and grey wires) to the throttle positions sensor on the right side of the throttle body. Connect the idle air motor (green/white, green/black, blue/white, blue/black wires) to the bottom of the throttle body near throttle position sensor.
Remove block drain plug on lower right side (passenger) of engine and install gm knock sensor # 10456126. YOU MUST USE THIS PART NUMBER KNOCK SENSOR. Most knock sensors look the same but are different electrically.
Install the Oxygen sensor and connect (purple wire)
Connect the MAP sensor located on passenger side of valve cover (green connector, green, black and grey wires).
Connect EST box to connector located near ECM ( blue/yellow, pink, black, yellow/black) ***NOTE***. The factory one is located near the throttle body on the passenger side of the intake manifold.
Connect the large gang-plugs to the ECM, making sure you do not force them into place and that they are correctly positioned.
Connect the 14 gauge orange wire to a 12 volt battery source (always hot)
Connect the 14 gauge pink wire to an ignition switched on (hot in start and run). A separate 12 V Ignition coil supply is needed, and may be connected to the same source (but do not use the same wire). Connect this pink wire to the + terminal of the remote coil or to the BAT side of an HEI coil.
Connect 14 gauge grey wire (fuel pump inscribed on it) to the fuel pump at the + terminal of the pump.
Connect “Check Engine Light” (light brown wire) to negative terminal of light fixture and a 12 volt Key on power source to the positive side of light. Use Low Wattage (1/4 or less) bulb.
Connect the loose purple wire, at the ECM end of the harness, to the “s” terminal of the starter circuit (in other words the wire that engages the starter solenoid)
Mount the ALDL connector out of sight, but easily accessible location for scanner connection later. (12 way black connector with an orange, black/white, and white wires)
Set the Throttle position sensor to 0.55 volts at idle using a digital, non-loading meter. ***NOTE*** Only adjust if necessary, some TPS sensors are not adjustable.
Bleed the fuel lines by cycling the ignition on, wait for the pump to run and shut off, then turn the key off, and repeat several times.
***NOTE***
If your injectors have set along time the gas in them will gum them up and they will not work. To make sure that they are in working order before plugging in the injectors take two pieces of scrap wire and put 12 volts to one side of the injector terminal and ground to the other. The injector should make a click sound. If not remove them and have them cleaned or replace them.
Start and run engine.
Set static timing at factory specs for your engine, but remember to disconnect the tan/black wire at the distributor to disable electronic timing adjustments while setting the static timing. Reconnect the tan/black wire when finished.
If you have any questions/problems or require technical
assistance, please call Larry’s Electric @ 618-282-2852 Monday – Friday
If for any reason that
you are not satisfied with this product with in 10 days of purchase please call
us and we will refund or exchange it, as long as the product is not altered in
any way shape or form and is returned it its original box with all pieces. Shipping
is a non refundable service, we are not responsible for shipping cost or
transit times.
This product is not intended for sale or
use on any emissions controlled vehicle which will ever be operated on a public
thoroughfare. For off road use only
™ Larry’s Electric, and Larryselectricsite.com
©2007-2008
REVISION 2
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