Question about Infiniti FX35

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My 2008 Infinity fx35 has a random hard start that the dealership mechanic can't resolve. Please Help!

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What you need is more info, Does it do it only when its hot? In the morning or after a trip.
Maybe start a log. You need to find out what you are lacking when it hard to start i.e. fuel or spark.
One of the first things that came to my mind however is the fuel pressure regulator in the fuel rail return line is leaking down. Lee

Posted on Jan 01, 2011


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My 2008 Infinity fx35 has a random hard start,engine will flood after 2 or 3 trieds.i will turn the ignition on and wait a minute before cranking holding the gas pedal to the floor it will start. also

If I understand your post correctly, once you get the car running, you have no more problems the rest of the day? That would explain why there are no codes. The ECU typically will not react to issues. Unfortunately these are complex systems, and Nissans tend to have some gremlins (I have an 07 FX, and had owned several others).
The easiest thing to check is the battery. The system depends on accurate voltages, so test the battery under load (the standard test won't do). If it's over 3 years old, it might be the cheapest first step to replace it. Keep in mind that both the engine and the battery operate better once warmed, so this is consistent with your "all day" experience.

Also, if you have occasion to start the car then turn it off quickly (like moving it inside at night, you can have unburned gas causing hard starts. This can happen in cases where the engine is run less than five minutes from cold.

Could be pressure valves, check valves, or a number of other things. If you live in a harsh climate, you may be getting some corrosion in the electrical connectors. This can through off voltage and cause the ECU to react to incorrect conditions. If you're handy or have a patient friend who is, the repair manuals have a fairly complete diagnostic process. Also, check the Infiniti forums.

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