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2002 Altima 2.5SL hard start and rough idle Forums > > 2002 Altima 2.5SL hard start and rough idle 2002 Altima 2.5SL hard start and rough idle
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Old 01-11-2009, 08:35 PM
bigboy9295
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Default 2002 Altima 2.5SL hard start and rough idle

Hello All. I'm hoping for some help. As the title states, I have a 2002 Altima 2.5SL with 62k on it. Symptoms are hard cold start, and rough idle for about 5 - 10 seconds. After that, the idle smoothes out and the car runs great. I was getting an SES light, and pulled the code. It is P0300 which is a random engine misfire code. I replaced all 4 coils and plugs. I have also changed the crank position sensor. Any suggestions and help would be greatly appreciated.
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Old 01-12-2009, 02:48 AM
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mpe235 mpe235 is offline
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Sounds like a head gasket leak. Coolant is entering the cylinders as the engine cools down. It then burns off when you start the car causing the rough idle.
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2002, 25sl, altima, hard, idle, rough, start

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