Wont start when warm

HOW many miles on the engine (REDUX)?/? 3.5L V6 engine? or 2.5 or the Diesel??????????
I'd have to drive IT to know.
let me guess the mech tested the car and it ran OKAY, so says" I can't find the problem. " ( what else")
you never told what the engine does , when it does fail and is Intermittent.
just that engine is ON. (runs)
and car does not move, sometimes.
what matters first, only when it fails, is does ENGINE RPM RISE fast and high when it fails.
see how that works, if it did the transmission is slipping (CVT are not fun here)
2500 RPM when it fails, right foot in to the throttle pedal this is transmission slip (failure)
if RPM are low failed, that is engine failure. (lean burning) or EGR stuck on or other problems , many.

lost engine power. has lots of causes; but this is gas(petrol) answer.

1: engine failing ,top cause , VVT or that chain loud noise? ?
2: spark plugs bad over 100k miles, (not diesel)
3: fueling bad, even bad fuel, or goes lean due to fuel pressure loss.(low) fuel pump weak?


driveLine choices day1, new not told gen 2, 2007 car.

Gasoline:
2.5 L QR25DE I4
3.5 L VQ35DE V6 <<<, seen in USA is it?
Diesel:
2.5 L YD25DDTi I4 no 2010 first

TransmissionCVT (Gasoline)

6-speed automatic (Diesel) 2010 up/

try new spark plugs and spark cop boots? 100k service point is is. and gaps will be way off ,when old

boots are here.

checkout NGK here. on COP boots x6

https://www.rockauto.com/en/catalog/nissan,2007,murano,3.5l+v6,1434436,ignition,spark+plug+/+ignition+coil+boot,10150

check whether you do have a problem with your cam or crank sensor. Or the fuel pump whether when it gets warm stop working,(loosing the pressure ) These things you do need a specialist to check the sensors and the fuel pump.

many possibilities but start with fuel pump. intermittent issue.

I had this same problem with my 2003 H2, my mechanic found that the fuel diaphragm was cracked and this was allowing my truck to flood. If it was a cold start, the extra fuel would evaporate and it would start fine. It actually got to the point where I would stall at a stop light or stop sign at idle. The part was is the neighborhood of $175.00 and about 1 hour of labor to install.

moister in dizzy cap and sounds like it has a hair line crack try cranking it over in the dark when engine is warm you will see spark leaving the cap if its cracked when its warm the spark escapes alot easier and wont start.

Is your car parked outside the garage?If yes,try park inside and see any difference.

My 05 1.6 renault megane struggles to start in th morning and once it does fire up you hav to rev it to ensure it wont cut out. The car then splutters and judders a bit till its warm then it tend to run ok. but keeps on switching off at the robots when i stop please what could it be

Sounds like the begining of a bad rack n pinion. We can eliminate the pump because the car turns to the right fine. There is no loss of fluid? The only thing left is the rack. It is a fairly commin issue. Use to call it morning sickness, The cars would be hard to turn in the morning or when first started but after running and warming up for a while they would start to work properly.

Sir,
This might now be of Humidity as what I can Tell is that you Coolent is not working you need to get its House pipe checked whether it blocked or not. and another thing check it engine Oil if it less or in Bad condition

Have you checked the heater plug relay?