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HOMESERVICE MANUALSCHEVROLET1986CAMARO BASE, 2.8 S, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSIS2.5L TBI TESTS W/CODESCHART A3 - CRANKS BUT WON'T RUN (A/F/J/N/P BODY)
1986 Chevrolet Camaro Base, 2.8 S, Standard

Chart A3 - Cranks But Won't Run (A/F/J/N/P Body)

1986 Chevrolet Camaro Base, 2.8 S, StandardSECTION Chart A3 - Cranks But Won't Run (A/F/J/N/P Body)
  • 1) A "SERVICE ENGINE SOON" light on checks for ignition and battery supply to ECM.
  • 2) Fuel spray from injector indicates that fuel is available, check engine for flooding.
  • 3) While cranking engine there should be no fuel spray with injector disconnected. Replace injector if it sprays or if it drips.
  • 4) If injector is okay, fuel system appears to be operating normally. Using ST125 spark gap tool, check voltage at spark plugs. No spark indicates an HEI problem. If spark is satisfactory, check the following; Throttle Position Sensor (TPS) for sticking or binding in wide open throttle position, coolant sensor "OPEN" signal to ECM using Code 15 chart, check for ice (cold weather) or foreign material in fuel. Engine may start after 5-6 minutes in heated shop. Check for EGR sticking open, open crank signal (cold weather), low fuel pressure or volume (lean air/fuel ratio). See A5.
  • 5) The EFI system is considered okay if no trouble was found. Reconnect injector and look for possible mechanical problems.
  • 6) No spray from injector indicates a faulty fuel system or no ECM control of injector. If test light "blinks" while cranking, ECM control is considered okay. Light may dim while "blinking". Use bulb 1847 or equivalent.
Fig 1: Flow Chart A3: Cranks But Won't Run (All)
G4718
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