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Item Description "Engine/Emissions-Diagnosis (Non-NAAO) 1990 Shop Manual" This book enables you to diagnose the electronic emission control system for your engine. It starts with the Diagnostic Routines - a list of symptoms that identifies likely causes in order of probability. You then use the diagnosis flow charts in the book to 1) identify a symptom 2) run a test and then 3) choose what to do next on the chart based on the outcome of your test. Some of the tests you can easily do yourself, wh...

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