Spectrum 3.0L GM, Parts & Service Manual

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INTRODUCTION
This service manual supplement has been devel-
oped to provide the service technician with the
basic understanding of the IMPCO certified fuel
and emission systems for the 3.0L GM engine.
This manual should be used in conjunction with
the base engine manual and the OEM service
manual when diagnosing fuel or electrical prob-
lems.
HOW TO IDENTIFY THE ENGINE YEAR
The emission label on the engine will identify the
specific model year.
SERVICING YOUR EMISSIONS
CERTIFIED ENGINE
Any maintenance and repair should be performed
by trained and experienced service technicians.
Proper tools and equipment should be used to
prevent injury to the servicing technician and
damage to the vehicle or components. Service
repairs should always be performed in a safe envi-
ronment and the technician should always wear
protective clothing to prevent injury.
For parts or labor to be reimbursed under the
IMPCO Technologies Inc. emission warranty, only
work performed by IMPCO or OEM trained techni-
cians using only IMPCO specified parts will qualify
for reimbursement. Refer to the IMPCO Labor
Time Guide for additional information.
For parts or labor not reimbursed under warranty,
a repair shop or person of the owner’s choosing
may maintain, replace, or repair emission-control
devices and systems. It is highly recommended
that any replacement parts used for maintenance
or for the repair of emission control systems be
new OEM replacement parts. The use of other
than genuine IMPCO replacement parts may im-
pair the effectiveness of emission control systems,
therefore, the owner should assure that such parts
are warranted by their manufacturer to be equiva-
lent to genuine IMPCO OEM parts in performance
and durability.
FUEL QUALITY
LPG engines and fuel systems are designed to
operate on HD-5 or HD-10 specification LPG fuel.
Fuel other than HD-5 or HD-10 may cause harm
to the engine’s emission control system and a
warranty claim may be denied on this basis if op-
erators can readily find the proper fuel.* Use of
any other fuel may result in your engine no longer
operating in compliance with CARB or EPA emis-
sions requirements.
*Not Applicable in the state of California.
FUEL LINE CONNECTIONS
Loctite® 567 is recommended for all NPT connec-
tions.
Do not use Teflon tape to seal any fuel fit-
tings. Fragments of the tape may enter into
the fuel system, causing damage or mal-
function of critical fuel system components.
AIR FILTRATION REQUIREMENTS
Dry filtration is required with maximum recom-
mended 4” W.C. restriction @ 75 cfm. IMPCO
strongly recommends the use of OEM or factory
replacement parts.
WASHING
Caution should be used when pressure washing
near or on an engine’s electrical system. Avoid
direct pressure spray on the system electrical
connectors. The electrical connectors are splash
resistant, but if high pressure water or steam is
sprayed directly at the connectors, moisture can
become trapped behind the connector seal and
cause serious system problems, many of them
showing up as intermittent.