K12 1.0 poor cold running/starting

[Nis]

Hi guy's and gals. I've had many different opinions on this one. When it's very cold it cranks but doesn't fire and when it does finally start I have to hold the revs on for a few mins to warm it up then it runs but feels like it's holding back all the time. This holding back only lasts for about half a mile or so. If I get it started and leave it it'll stall and be a 'mare to get it running again.

A few weeks ago the MIL light came on and I did a fault code on it and it came up with a cam sensor fault so I replaced it and it was fine. A weeks or so ago it did the same thing again. Again it was the cam sensor fault but I have not bothered to replace it this time.

I have been told about the dreaded chain problem and the dealer said if the tensioner had moved any more than 11mm the chain was fubar'd. I looked it at the weekend and it had only moved 8mm.
They also told me it could be a dirty flywheel but I check that too and it was clean so I cleaned the sensor back up and re-fitted it.

Could it be:-
Crank sensor
Dodgy new cam sensor
Water temp sensor
Dreaded chain
Dirty flywheel
Cracked airbox/dodgy seal

I'm starting to lose my patience with it now.

And help and advise gratefully received.

Ivan

 

[nissanmicrak12]

i had this problem and belive it or not and i dont know how or why but that stuff called red ex? chucked that in my tank and filled up with vpower and it sorted it out nissan said that it was the sensor they replaced it and it happened again. so i did that got the code re set and it hasnt done it since hope this helps