just a wild guess ( as you mentioned poor cranking..) have your mechanic look into the Cam and Crank sensors. We on this forum have all had to eventually replace them, including myself about 2 years ago.Nissan X Trail T30 2006:
My 2006 X Trail has had a few problems recently, it has never had an issues in the past, is serviced well and has 120000KM on the clock.
The first issues that came up roughly two weeks ago were an unusually long crank time, poor fuel economy and a noticeable petrol smell in the oil. The car never failed to start however and had great acceleration and power as usual when driving.
I decided to give it a decent service including; coolant, plugs, air, oil, and fuel filters and fresh castrol edge 5W-30. I even bought fuel pump assembly o-rings direct from nissan as I know these need to be replaced with every fuel filter change. This fixed the long crank time, but the oil has fuel dilution again and now the fuel consumption is incredible, over 16L to the hundred.
I have barely driven it since problems arised as im worried the fuel dilution will cause more severe issues but I'm sure to warm it up when I do. Just wondering if anyone else has had similar issues with their QR25DE engine and if so how they were resolved... or not. I'm thinking it may be an injector leak, mechanic booked for next week.
- Search the forum on here for ''cam/crank sensors''.....and see if this applies to your current issues. If so, it's not a high cost part(s) and you may be able to replace yourself if you are mechanically inclined . Or pay your local garage to do it. Just ask around for reasonable quotes and don't get gouged.