ISO 3929-1976 rus PDF

Full title and description

St ISO 3929-1976 — Road vehicles — Determination of exhaust carbon monoxide concentration at idle speed. This International Standard (first edition, June 1976) specifies a test method for measuring the concentration of carbon monoxide (CO) in the exhaust of spark‑ignition engines when the engine is running at idle. The 1976 edition has since been withdrawn and the work revised in later editions of ISO 3929.

Abstract

The standard defines a procedure for sampling and analyzing exhaust gas from road vehicles at idle to determine the CO concentration. It was intended for use in inspection and maintenance contexts to detect excessive CO emissions from spark‑ignition engines and to support vehicle diagnostic and regulatory checks. The original 1976 document is short (two pages) and was superseded by subsequent revisions that broaden measurement methods for inspection and maintenance.

General information

• Status: Withdrawn (1976 edition withdrawn; later revised editions published).
• Publication date: June 1976 (first edition).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 43.060 (Transport exhaust emissions), 13.040.50 (Air quality / vehicle emissions).
• Edition / version: Edition 1 (1976).
• Number of pages: 2 pages (original publication).

Key bibliographic details above are taken from the ISO catalogue entries for ISO 3929 (1976) and for the later ISO 3929 (2003) revision.

Scope

Applies to road vehicles equipped with spark‑ignition (controlled ignition) engines for the purpose of determining the concentration of CO in the exhaust while the engine is idling. The 1976 edition focused specifically on the single test at idle speed; later revisions expanded and consolidated measurement methods for emissions during vehicle inspection and maintenance. Users should apply the later ISO 3929 revisions for current, broader inspection/maintenance procedures.

Key topics and requirements

• Procedure for sampling exhaust gas at engine idle.
• Analytical measurement of carbon monoxide concentration (CO) in exhaust.
• Simple, short test procedure intended for inspection and maintenance environments.
• Requirements intended for spark‑ignition engines (excluding engines supplied with fuel/oil mixtures in earlier wording).
• Basis for later, more comprehensive ISO methods for inspection/maintenance emissions testing.

Typical use and users

Typical users are vehicle inspection bodies, maintenance workshops, regulatory agencies and technicians performing roadside or garage checks for CO emissions. The 1976 method would have been used where a short idle CO check was required; modern inspection schemes typically use the updated ISO 3929 methods (or national equivalents) for routine checks.

Related standards

ISO 3929:1976 was later revised (ISO 3929:1995 and subsequently ISO 3929:2003). The 2003 edition (and later confirmations) provides measurement methods for exhaust gas emissions during inspection or maintenance and replaces the 1976 idle‑only procedure. Other related vehicle exhaust emissions and testing standards (national adoptions and ISO family standards) should be consulted for comprehensive inspection and regulatory requirements.

Keywords

ISO 3929, carbon monoxide, CO, exhaust emissions, idle speed, road vehicles, inspection, maintenance, spark‑ignition engines, vehicle emissions test.

FAQ

Q: What is this standard?

A: ISO 3929:1976 is the first‑edition International Standard that defined a method to determine exhaust carbon monoxide concentration at engine idle for road vehicles. It is a short procedural standard published by ISO in June 1976.

Q: What does it cover?

A: It covers the sampling and measurement procedure for CO in vehicle exhaust while the engine runs at idle speed, aimed at simple inspection/diagnostic checks for spark‑ignition engines. The scope was later incorporated into broader inspection/maintenance methods in subsequent revisions.

Q: Who typically uses it?

A: Vehicle inspection stations, maintenance workshops, emissions technicians and regulatory or enforcement bodies concerned with tailpipe CO emissions. For current practice, these users typically rely on the later ISO 3929 revisions or national standards derived from them.

Q: Is it current or superseded?

A: The 1976 edition has been withdrawn and is superseded by later editions (notably ISO 3929:1995 and ISO 3929:2003). Consult the ISO catalogue or the latest national adoption for the current, in‑force text.

Q: Is it part of a series?

A: Yes — ISO 3929 (as a number) has later editions and related documents covering measurement methods for exhaust emissions during inspection or maintenance; the 1976 document is the original, now superseded member of that series.

Q: What are the key keywords?

A: Carbon monoxide (CO), exhaust gas, idle speed, road vehicles, inspection, maintenance, spark‑ignition engine, emissions testing.