Section 76 (Engine Performance System Removal, Overhaul & Installation - Bi-Fuel): Introduction

WARNING: This page is about a different car, the 2002 GMC Savana and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: When battery and some PCM input devices are disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

This article covers removal, overhaul and installation procedures (when given by manufacturer). If component removal and installation is primarily an unbolt and bolt-on procedure, only a torque specification may be supplied.

Vehicles are available with optional 5.7L (RPO KL5) bi-fuel Compressed Natural Gas (CNG) system (RPO KL6). All 5.7L engines are identified by Vehicle Identification Number (VIN) "R". The fuel control system on these engines is separate from the gasoline fuel system and has unique parts. This article only covers removal, overhaul and installation procedures for CNG components on bi-fuel vehicles. Procedures for systems and components that are the same as gasoline powered models are not included in this article. See REMOVAL, OVERHAUL & INSTALLATION - CHEVY EXPRESS & SAVANA - GASOLINE article. Alternate fuel powered vehicles utilize special fuel tanks, fuel filler valve and line, high pressure lock-off solenoids, fuel tank pressure sensor, fuel tank temperature sensor, high pressure fuel lines, high pressure lock-off solenoid, high pressure regulator, low pressure regulators, intermediate pressure fuel lines, low pressure hose, fuel mixer, idle solenoid, fuel control solenoid and filters. See Fig 1 and Fig 2 .

Fig 1: Locating Bi-Fuel CNG Components (Front)

Courtesy of GENERAL MOTORS CORP.

Fig 2: Locating Bi-Fuel CNG Components (Rear)

Courtesy of GENERAL MOTORS CORP.