Diagnosing Failure To start and Run

Starter Cranks?
No
Yes
Starter Spins? Clicks usually low voltage or poor connections
No
Yes
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Battery read over 12V?
No
Yes
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Jump start or pop start car and check if battery is charging
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Cleared terminals?
No
Yes
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Clear battery terminals and connectors, engine ground.
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With car in park or neutral, use heavy jumper or screwdriver to bypass starter relay solenoid. Test starter.
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Solenoid stuck not powered, missing teeth on flywheel.
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Engine Fires?
No
Yes
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Sparks to plugs?
No
Yes
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Sparks from coil?
No
Yes
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Mecanical distributor?
No
Yes
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For electronic distribution, see model manual for diagnostic checks.
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Check condenser, points or magnetic pick-up, rotor, or cap damage.
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12V+ at coil primary?
No
Yes
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Ignition system wiring, voltage regulator.
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Test coil for intenal short. Checl seondary output wire resistance
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Fuel to filter?
No
Yes
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Fuel injected?
No
Yes
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Try starter spre in carb, throttle open.
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Single point, check throttle body. Electronic multi-point, separate diagnostic.
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Vapor lock, fuel pump, blockage.
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Starts and stalls?
No
Yes
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Ignition timing, fuel problem, cranking too slow - battery, starter.
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Check OBD, blink code?
No
Yes
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Read OBD or OBD II or check blink code access.
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Stalls on key release to run?
No
Yes
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Ignite "run" circuit or column key switch failure. Ring out with meter.
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Stalls in rain
No
Yes
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Check for cracked coil. distributor. Check visible electrical arcing running in dark.
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Stalls warm?
No
Yes
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Adjust idle, blow out fuel filter, check fuel pump output. Check vacuum leak or sensor failure.
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On cold stalling, check for stuck chock, EGR. Check for vacuum leak
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