41 - F BASIC TESTING Article Text 1989 Volkswagen Golf For...

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F - BASIC TESTING Article Text 1989 Volkswagen Golf For Volkswagen Technical Site Copyright © 1998 Mitchell Repair Information Company, LLC Monday, August 23, 1999 11:52PM ARTICLE BEGINNING 1989 ENGINE PERFORMANCE Volkswagen Basic Diagnostic Procedures Cabriolet, Fox, Golf, Golf GT, Jetta, Vanagon INTRODUCTION The following diagnostic steps are here to prevent overlooking a simple problem This is also the place to start diagnosis for a "NO-START" condition. The first step in diagnosing any driveability problem is to verify that the problem exists. This may be accomplished by test driving the vehicle under the conditions during which the problem reportedly occurs. A careful and complete inspection of several systems is required. Most driveability or "no-start" problems are not related to engine control systems, but are in fact simple mechanical, electrical, fuel or vacuum related faults. Most engine control problems are the result of mechanical breakdowns, poor electrical connections or damaged or misrouted vacuum hoses. Before considering the control system as a possible cause of problems, ignition high tension wires, fuel supply, electrical connections and vacuum hoses should be checked. Failure to do so may result in improper diagnosis or lost diagnostic time. NOTE: All voltage tests should be performed with a Digital Volt Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated different in testing procedures. PRELIMINARY INSPECTION & ADJUSTMENTS VISUAL INSPECTION Perform a visual inspection of all electrical wiring. Look for chafed, stretched, cut or pinched wiring. Inspect electrical connectors and connections for a clean, tight fit. Repair as necessary. Inspect all vacuum hoses for proper routing, cuts or pinches. If necessary, see VACUUM DIAGRAMS article to verify correct routing and connections. Repair as necessary. Inspect air induction system for possible vacuum leaks or obstructions in air cleaner (ice, mud, etc.) MECHANICAL INSPECTION Compression Engine mechanical condition can be checked using a compression gauge, vacuum gauge, or an engine analyzer capable of performing a cylinder balance test. See engine analyzer instruction manual for availability and description of relative compression
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F - BASIC TESTING Article Text (p. 2) 1989 Volkswagen Golf For Volkswagen Technical Site Copyright © 1998 Mitchell Repair Information Company, LLC Monday, August 23, 1999 11:52PM feature. On models equipped with CIS fuel injection system, check compression with engine warm, all spark plugs removed and throttle wide open. Ground coil wire from center of distributor cap to engine block. Disconnect one end of duct between airflow sensor and throttle body to disable fuel injection system. Crank engine through at least 6 compression strokes per cylinder to determine engine compression.
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  • Spring '08
  • heydari
  • Internal combustion engine, Fuel injection, Ignition system, Spark plug, Volkswagen Technical Site, Mitchell Repair Information Company

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