Vortech H3 I-5 Hummer - 2006-2008 User Manual
Page 14
P/N: 4GN020-010
©2008 Vortech Engineering, LLC
All Rights Reserved, Intl. Copr. Secured
20OCT08 v2.0(4GNv2.0)
6
Fig. 5-a
Fig. 5-b
Fig. 5-g
A. Locate and remove the engine lift point on
the front driver’s side and set aside. Remove
the retainers securing the alternator to the
alternator mounting bracket. Set the alterna-
tor and hardware aside. (See Fig. 5-a.)
B. Disconnect the fuel supply line where it con-
nects to the fuel rail. (See Fig. 5-b.)
C. Remove the intake manifold. Start by discon-
necting the hoses and cables that are
secured to the intake manifold. Then remove
the ten 10mm-headed fasteners that secure
the intake manifold to the cylinder head. Set
the intake manifold, hardware and gasket
aside.
D. Disconnet the fuel injector harness from the
injectors and the engine harness connection
at the rear of the engine. Discard the injector
harness as it will not be reused. Remove the
three 10mm headed screws that secure the
fuel rail to the cylinder head and set aside.
E.
Remove the fuel rail and injectors as an
assembly. Separate and set aside the factory
fuel injectors as they will not be re-used.
F.
Apply a small amount of clean motor oil to
lubricate the O-rings of the supplied injectors.
Install the supplied injectors into the fuel rail
using the factory injector retaining clips, set in
the position close to the plug.
G. Reinstall the fuel rail assembly and secure
using the three factory retaining screws.
NOTE:
Caution should be used when working on the
fuel system. Fuel may be under high pres-
sure. Fuel injector replacement should be
performed in a well ventilated area free of
any possible ignition source. It is recom-
mended that you have a fire extinguisher
nearby.
NOTE:
The injector plug connections must face out
towards the driver’s side of the vehicle.
NOTE:
Make sure all wires and hoses are clear of
mounting surfaces and are secure from hot
or moving objects.
H. Install the provided injector harness and
secure to the fuel rail using the cable-ties
provided. (See Fig. 5-g.)
I.
Inspect the intake manifold gasket. If dam-
aged, replace before proceeding. Reinstall
the intake manifold, alternator and engine lift
point in the reverse order removed.
Reconnect the fuel supply line to the fuel rail.
ENGINE LIFT
POINT
FUEL SUPPLY
CONNECTION
5. FUEL INJECTOR REPLACEMENT