Question about 2002 Nissan Altima

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Car wont start when it gets cold out

Gets below 10 degrees wont start

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You don't say whether it is petrol or diesel engined or whether the engine is cranking fine but won't fire.

Certainly an engine must crank quick enough but even then if it is the best diesel engine ever made it is unlikely to start below freezing without an artificial starting aid. Such an aid is already installed but must be in good condition. Heater plugs do fail sometimes or get tired and lazy so they need checking and sometimes the timer relay fails to switch them on. Good injector spray patterns are also needed for good starting.

Petrol engines need enrichment of the fuel/air mixture for cold starting and a very good spark at the plugs. Worn spark plugs is the most common cause of poor starting and if the ECU isn't getting the right information about temperature it will be unable to make the correct fuel adjustments.
A good injector spray pattern is also important.

Lots to think about...

Posted on Feb 21, 2015


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Posted on Jan 02, 2017


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