Nissan X-Trail T32 stalls

[GT88]

Hi all,

Our auto 2016 Nissan X-Trail T32 with 50k km randomly stalls when in P or at the lights. The issue started a few months ago. Happens randomly. The mechanic connected to the computer and couldn't find any faults. Nissan said there are no known issues. It seems the idle isn't right and runs rough which probably causes low revs then a stall.

Had a general service the other month.
Air filter is clean.
I cleaned throttle body. Is it worth resetting the throttle/idle speed? These have electronic throttle bodies and I found the steps required to reset.
The coils appear to be good and working.
Spark plugs aren't due to be replaced for another 50k km so not sure if I should replace?
MAF sensor looks clean but I'll buy the MAF cleaner and spray that out.
I can't hear any vacuum leaks. Is there any tests or things I can do to get some certainty?
I put some Liqui Moly injector cleaner a few days ago. We use 91, not sure if 98 is worth trying?
I understand the fuel filter is a non replaceable part.
Has a new battery as the old recently died.

Any other tips?

Thanks.

[Citroënbender]

Is it an auto or a CVT?

When it stalls, can you re-start it immediately? Does it run smoothly once re-started? Can you avoid stalling by keeping the revs up?

[GT88]

CVT. Restarts fine and runs normally afterwards. I could keep the revs up but that won't solve the underlying problem.

[Citroënbender]

I feel it’s a transmission issue, not the motor.

[Dr Smith]

I was going to suggest fuel filter until I read your 2nd last line.
So how does one clean the filter, because while it may be non-replaceable which sounds a bit odd, how can a company guarantee you'll never have one clog or eventually fail?

[Dr Terry]

Many late model cars have no separate "serviceable" fuel filter.

In most of those cars the filter is part of the fuel pump module, inside the fuel tank.

The life of these is around 150-250k km, so when the fuel pump fails, the whole module (including the filter) gets replaced as a single item.

IMHO the manufacturer should specify a "life" for these things, but they simply don't care about cars outside of the warranty period.

The OP's problem doesn't sound fuel related, I agree with Citroënbender, it could be a CVT drama. At only 50 km you would have a good case for warranty with our consumer laws.

Dr Terry

[GT88]

Interesting suggestion about CVT. I'll look into that.
The service manual says the fuel filter is an in-tank maintenance free item.

[Citroënbender]

A fuel supply problem generally manifests under load, not stopped or at idle. The exceptions are when electrical supply to the in-tank pump are poor (eg the infamous fuel pump earthing issue with older Volvos).

Either way - fuel supply pressure can be checked with a gauge spliced in just before the rail, you snake the flex fuel hose out under the back edge of the bonnet and prop the gauge on the wiper blade to watch it in test driving. The needle position should be solid.