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02 Primera - intermittant engine warning light

  • 07-10-2010 7:43am
    #1
    fpm
    Registered Users, Registered Users 2 Posts: 42 ✭


    Folks,
    Hoping someone might have a suggestion...

    My GFs 1.6 Petrol 02 Nissan Primera, 95k miles..recently the engine warning light has started coming on...and then going off again. It might be on for a couple of days, and off for a couple of days. As soon as the light comes on, the fuel economy goes through the floor, only around 25mpg. When the light is off, fuel economy is normal again (36mpg-ish). Car drives fine always, except when the light is on, there's a very faint 'chugging', when off the throttle, but its barely noticeable.

    We took the car to the local garage, who changed the oxygen sensor, but the intermittant problem persists.

    Any ideas what it might be? The only thing I could think of that could cause such a drop in fuel economy would be the cat, but that wouldn't be an intermittant problem?

    Thanks in advance.
    FP


Comments

  • #2
    Paddysnapper
    Registered Users, Registered Users 2 Posts: 227 ✭✭Paddysnapper


    The fist place I would look would be the engine management system...When you next have the red light get it put on a diag. machine pronto!


  • #3
    kerten
    Registered Users, Registered Users 2 Posts: 937 ✭✭✭kerten


    I guess MAF(Mass air flow) sensor is dirty or broken. If diagnosis points that, try to clean it with contact cleaner. If it doesn't help, time to change


  • #4
    johner07
    Registered Users, Registered Users 2 Posts: 14 ✭johner07


    hi mate just seein your post befor you even go back to the dealer go to tgis site www.NPOC.co.uk i am a member of this site and from i join i have no gone near a dealer i also have 03 nissan pirmera 2.2THE PRIMERA is also named p12 on the NPOC SITE tell them wat your promble is and they will have you mate
    fpm wrote: »
    Folks,
    Hoping someone might have a suggestion...

    My GFs 1.6 Petrol 02 Nissan Primera, 95k miles..recently the engine warning light has started coming on...and then going off again. It might be on for a couple of days, and off for a couple of days. As soon as the light comes on, the fuel economy goes through the floor, only around 25mpg. When the light is off, fuel economy is normal again (36mpg-ish). Car drives fine always, except when the light is on, there's a very faint 'chugging', when off the throttle, but its barely noticeable.

    We took the car to the local garage, who changed the oxygen sensor, but the intermittant problem persists.

    Any ideas what it might be? The only thing I could think of that could cause such a drop in fuel economy would be the cat, but that wouldn't be an intermittant problem?

    Thanks in advance.
    FP


  • #5
    bren11
    Registered Users, Registered Users 2 Posts: 137 ✭✭bren11


    Hi,

    If it is the P12 model, it could be a stretched timing chain. Engine will sound rough at idling. Will throw up errors relating to camshaft / crankshaft sensors.


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