Campaign - Carburetor Anti-Dieseling Solenoid: Overview

Number: 86C22

Section: 6E

Date: June, 1987
Subject: PRODUCT EMISSION CAMPAIGN 86C22
CARBURETOR ANTI-DIESELING SOLENOID CONNECTION


Model and Year: 1985-1986 CHEVROLET C/K 20 LIGHT DUTY MODEL TRUCKS EQUIPPED
WITH 5.7L GAS ENGINE (RPO LT9) HEAVY DUTY FEDERAL EMISSIONS (RPO H5D/NA5) AND 4-SPEED MANUAL TRANSMISSION (RPO M20)
TO: ALL CHEVROLET DEALERS

General Motors has detemined that the engine electrical harness pigtail was not connected to the anti-dieseling solenoid on the carburetor of Flint production 1985-1986 Chevrolet C/K 20 models equipped with 5.7L gas engines, manual transmission and heavy duty federal emissions. Not connecting the engine harness to this solenoid results in a curb idle speed of 600 rpm rather than the specified 800 rpm curb idle.

It is necessary to connect the existing engine electrical harness pigtail to the anti-dieseling solenoid to bring these vehicles into conformity.