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Home >> Chevrolet >> 1985 >> Impala 5.0 H >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Dual Unit TBI >> Trouble Shooting >> Preliminary Checks

Preliminary Checks

  1. Before using trouble shooting section, perform DIAGNOSTIC CIRCUIT CHECK to determine that ECM and "CHECK ENGINE" light are working properly, that there are no stored trouble codes or that there is a trouble code but no "CHECK ENGINE" light.
  2. The fuel control system is operating properly by performing "Field Service Mode" check of DIAGNOSTIC CIRCUIT CHECK. See COMPUTER COMMAND CONTROL SYSTEM in ENGINE PERFORMANCE section. Verify customer complaint, if "engine cranks but will not run", see CHART A-3 in this article.
  3. Before beginning trouble shooting procedures, check vacuum hoses for splits, kinks and proper routing. Check for air leaks between throttle body and intake manifold. Check ignition wiring for cracking, hardness, proper routing and carbon tracking. Check wiring for proper connections, pinching and cuts.
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