If exhaust system backpressure is greater than 1 3/4-2 psi, exhaust system or catalytic converter is plugged. 2) Connect a 1-10 psi pressure gauge, and run engine at 2500 RPM. Remove oxygen sensor or air injection check valve (if equipped). 156-185 psi (11-13 kg/cm ) Exhaust System Backpressure 1) Exhaust system can be checked using a vacuum or pressure gauge. COMPRESSION SPECIFICATIONS TABLE Application Specification (Minimum) Compression Pressure ………. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate engine oiling system. WARNING: Do not use ignition switch during compression tests on fuel injected vehicles. See engine analyzer manual for specific instructions. Inspect air induction system for possible vacuum leaks.Ĭompression Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer. See M – VACUUM DIAGRAMS – TURBO article to verify routing and connections (if necessary). Ensure vacuum hoses are properly routed and not pinched or cut. Ensure electrical connectors fit tightly and are not corroded. Look for chafed, stretched, cut or pinched wiring. NOTE: Perform all voltage tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless otherwise instructed in test procedure. Before condemning the computerized system, perform each test listed in this article. Most engine control problems result from mechanical breakdowns, poor electrical connections or damaged/ misrouted vacuum hoses. Before entering self-diagnostics, perform a careful and complete visual inspection. The first step in diagnosing any driveability problem is verifying the customer complaint with a test drive under the conditions the problem reportedly occurred. This is also where to begin diagnosis for a no-start condition. The following diagnostic steps will help prevent overlooking a simple problem. NOTE: In this article, Engine Control Module (ECM) may also be referred to as Engine Control Unit (ECU). 1995 ENGINE PERFORMANCE Volvo – Basic Diagnostic Procedures 850 – Turbo INTRODUCTION
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