Condition | Possible Cause | Action |
---|---|---|
Hard starting (Engine cranks OK)
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Faulty spark plug
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Leaky high-tension cord
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Loose connection or disconnection of high tension cords or lead wires
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Faulty ignition coil
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Dirty or clogged fuel hose or pipe
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Malfunctioning fuel pump
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Air inhaling from intake manifold gasket or throttle body gasket
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Faulty idle air control system
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Faulty ECT sensor or MAF sensor
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Faulty ECM
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Low compression
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Poor spark plug tightening or faulty gasket
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Compression leak from valve seat
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Sticky valve stem
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Weak or damaged valve springs
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Compression leak at cylinder head gasket
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Sticking or damaged piston ring
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Worn piston, ring or cylinder
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Malfunctioning PCV valve
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Camshaft position control (VVT) system out of order
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Faulty EGR system
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