Question about Nissan Altima

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My altima won't start when it is warm

Hello, I have a 2005 altima, and when I go for a 5 mile drive and stop for 15 min. When I go to start my car. the engine will turn over but the car won't start. Lately, I replaced my cranshaft and cam sensors that I got from nissan. I also replaced 4 spark plugs (NGK laser). I have also replaced my pcv valve this morning and my air filter. I have tried everything from the forums but no solution. I have checked my MAF sensor and It looks clean. Before I had no check engine light, but I heard about the sensors that could go bad. so I replaced them. Now, I have a check engine light with the catalyst system efficiency below threshold. my car drives smooth. what can cause my car not to start Please help me, I am lost

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Try to put food on gas when you start up and hold.

Posted on Nov 25, 2013


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Posted on Jan 02, 2017

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SOURCE: code check=number 5 misfire

From what I have read up, faulty ignition coils are a regular issue with 2002 model onwards. Also a broken PCV hose. Please check that

Posted on Jul 09, 2009

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SOURCE: 420 code catalyst system efficiency below

You could have an enefficient converter. Question is what caused it to go bad? I have attended seminars on code 420, Possible causes are lack of spark or clogged fuel injectors. there have been times where the spark plug wire lays on the engine and over time it wears a weak spot in the side of the wire, its not enough to throw a miss fire code but it keeps the full amount of spark from getting to the plug and not burning the all the fuel in the cyl. A leaky injector would also cause to much fuel to be deliverd into the cyl and not get burned.

Hope this helps.

Posted on Jan 20, 2010

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SOURCE: code PO420 catalyst system efficiency below threshold

you may have a bad converter, its not cleaning the exhaust, but on the other hand a bad rear o2 sensor can also cause this problem,there is a wat to test but you would need a scan tool or scope,replace the other sensor, if light returns then replace the converter, no money lost, if you were to replace the converter the o2 sensors should also be replaced. you have 165000 miles it would be crazy not to replace sensor and install new cat, so basically your just doing it in 2 steps and may get lucky and not need a cat. good luck.

Posted on Mar 05, 2010

Testimonial: "Your information is exactly what I needed to know.I suppose I just did not want to spend the money for a cat. converter. Thanks again for your help. "

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