41 - F - BASIC TESTINGArticle Text1989 Volkswagen GolfFor...

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Unformatted text preview: F - BASIC TESTINGArticle Text1989 Volkswagen GolfFor Volkswagen Technical Site Copyright 1998 Mitchell Repair Information Company, LLCMonday, August 23, 1999 11:52PMARTICLE BEGINNING1989 ENGINE PERFORMANCEVolkswagen Basic Diagnostic ProceduresCabriolet, Fox, Golf, Golf GT, Jetta, VanagonINTRODUCTIONThe following diagnostic steps are here to preventoverlooking a simple problem This is also the place to start diagnosisfor a "NO-START" condition.The first step in diagnosing any driveability problem is toverify that the problem exists. This may be accomplished by testdriving the vehicle under the conditions during which the problemreportedly occurs.A careful and complete inspection of several systems isrequired. Most driveability or "no-start" problems are not related toengine control systems, but are in fact simple mechanical, electrical,fuel or vacuum related faults. Most engine control problems are theresult of mechanical breakdowns, poor electrical connections ordamaged or misrouted vacuum hoses.Before considering the control system as a possible cause ofproblems, ignition high tension wires, fuel supply, electricalconnections and vacuum hoses should be checked. Failure to do so mayresult in improper diagnosis or lost diagnostic time.NOTE: All voltage tests should be performed with a Digital VoltOhmmeter (DVOM) with a minimum 10-megohm input impedance,unless specifically stated different in testing procedures.PRELIMINARY INSPECTION & ADJUSTMENTSVISUAL INSPECTIONPerform a visual inspection of all electrical wiring. Lookfor chafed, stretched, cut or pinched wiring. Inspect electricalconnectors and connections for a clean, tight fit. Repair asnecessary. Inspect all vacuum hoses for proper routing, cuts orpinches. If necessary, see VACUUM DIAGRAMS article to verify correctrouting and connections. Repair as necessary. Inspect air inductionsystem for possible vacuum leaks or obstructions in air cleaner (ice,mud, etc.)MECHANICAL INSPECTIONCompressionEngine mechanical condition can be checked using acompression gauge, vacuum gauge, or an engine analyzer capable ofperforming a cylinder balance test. See engine analyzer instructionmanual for availability and description of relative compressionF - BASIC TESTINGArticle Text (p. 2)1989 Volkswagen GolfFor Volkswagen Technical Site Copyright 1998 Mitchell Repair Information Company, LLCMonday, August 23, 1999 11:52PMfeature.On models equipped with CIS fuel injection system, checkcompression with engine warm, all spark plugs removed and throttlewide open. Ground coil wire from center of distributor cap to engineblock. Disconnect one end of duct between airflow sensor and throttlebody to disable fuel injection system. Crank engine through at least 6compression strokes per cylinder to determine engine compression....
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41 - F - BASIC TESTINGArticle Text1989 Volkswagen GolfFor...

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