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Irregular idle speed on Nissan P11 Primera

  • 18-11-2009 12:13pm
    #1
    WhistlingDixie
    Closed Accounts Posts: 51 ✭✭


    Does anyone know why this is happening?

    Idle speed should be about 600 - 700 rpm I think. When I come to a stop (like at traffic lights), it sometimes idles at about 1100 rpm until I tap the accelerator, after which it comes doen to a normal 600-ish. Also, when at the lights, it might idle at normal speed, then increase to 1100 for no apparent reason, then drop to 300 rpm after a little while. It's a '97 with 89,000 on the clock, and it was lying up for about a year till about 3 months ago. I did a service on it myself about 2.5 months ago.


Comments

  • #2
    Tefral
    Registered Users, Registered Users 2 Posts: 4,396 ✭✭✭Tefral


    Idle air control valve or a collapsed vacuum hose


  • #3
    blueband
    Registered Users, Registered Users 2 Posts: 122 ✭✭blueband


    Had this on a car I had, and a friend had it on another. none of them nissan's so this might not be related, but there was a problem with a build up of "gunk" in the throttle box.
    Once this was cleaned out ran smooth as the proverbial baby's bottom


  • #4
    Mr Benevolent
    Closed Accounts Posts: 12,456 ✭✭✭✭Mr Benevolent


    Any of the above or the Mass Air Flow sensor.


  • #5
    WhistlingDixie
    Closed Accounts Posts: 51 ✭✭WhistlingDixie


    Thanks for the replies guys. It's really a problem that I can live with, though, although I'll probably mention it to the mechanic when he's doing the pre-NCT thing next year.


  • #6
    zilog_jones
    Registered Users, Registered Users 2 Posts: 6,638 ✭✭✭zilog_jones


    Pre-NCT tests are a scam, don't bother. Your car will fail the NCT if it is not idling within 100RPM of the manufacturer's specifications though, so just get that sorted out. You're probably wasting fuel from the high idling too.


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  • #7
    zilog_jones
    Registered Users, Registered Users 2 Posts: 6,638 ✭✭✭zilog_jones


    They test emissions at idle speed, it will fail if RPM is out of specs. Read the manual, it's on their website.


  • #8
    jaffa20
    Registered Users, Registered Users 2 Posts: 4,565 ✭✭✭jaffa20


    Well i have the exact same problem on my a3 and it passed the nct no bother :rolleyes:

    I've tried everything to fix it but it's still the same. Mainly happens in hot weather so it's a joy to drive at the moment cause only happens the odd time. I'm learning to live with it. Higher fuel consumption is a bit of a pain though.


  • #9
    Big Nasty
    Registered Users, Registered Users 2 Posts: 22,080 ✭✭✭✭Big Nasty


    jaffa20 wrote: »
    Well i have the exact same problem on my a3 and it passed the nct no bother :rolleyes:

    I've tried everything to fix it but it's still the same. Mainly happens in hot weather so it's a joy to drive at the moment cause only happens the odd time. I'm learning to live with it. Higher fuel consumption is a bit of a pain though.

    In the Audi it's more than likely the MAF or lamda sensor - they're notorious for it.


  • #10
    shane b
    Registered Users, Registered Users 2 Posts: 610 ✭✭✭shane b


    HI
    had a similiar problem with my primera changed the airflow meter which sorted the problem. had a thread on here entitled mass air flow meter which describes the problems i was having.

    http://www.boards.ie/vbulletin/showthread.php?t=2055371505


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