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diesel engine.bring a piece of wire from battery to glow plug rail to heat the plugs .and count to 20 ,if starts then u have a bad glow plug relay.if it still dosent start open an injector or 2 and crank engine and look for fuel .if fuel appears then it just mite be an air lock/

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Q: Why wont your car start even though the glow plugs have been changed?
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