Results 1 to 9 of 9

Thread: engine misfire/down on power

  1. 16th July 2012, 11:30 AM #1
    brend0n
    brend0n is offline Master
    Join Date
    May 2008
    Location
    Rockhampton
    Posts
    275
    Total Downloaded
    0

    engine misfire/down on power

    Hi everyone,
    this morning took the car for a drive,
    missing alot and no power (top 50% of throttle) backfiring, had a fairly empty tanks. so Filled her up, ran better but still missed got most of the power back.

    its had a miss on and off for awhile, and usually when I have time/good weather to diagnose its running fine.

    as its a flapper ecu, could the car be telling me its on its way out or not.

    I have the hotwire set up minus the wiring and ecu, so I'm on the hunt
    Reply With Quote Reply With Quote
  2. 18th July 2012, 04:56 PM #2
    Not_An_Abba_Fan
    Not_An_Abba_Fan is offline Master
    Join Date
    May 2012
    Location
    Dalyellup
    Posts
    165
    Total Downloaded
    0
    How long has it been since you replaced the fuel filter?
    Reply With Quote Reply With Quote
  3. 21st July 2012, 06:40 PM #3
    Bundy
    Bundy is offline Master
    Join Date
    Sep 2009
    Location
    Sydney
    Posts
    167
    Total Downloaded
    0
    What is it like under the distributor cap?
    Moistu=re and cracks play havoc.
    Reply With Quote Reply With Quote
  4. 29th July 2012, 06:46 PM #4
    brendanjjm Guest

    Air Filter Popping

    Hi Brendon,

    This sound's similar to my prob, in a way I hope.

    Under accelleration, 2 - 4,000 RPM my 3.9lt 1992 Rangie coughs and spits air out the airfilter.

    I am quite confused but doubt it's the mass airflow meter, could be wrong of course.

    Has anyone had this issue and were able to fix it?

    Cheers, Brendan
    Reply With Quote Reply With Quote
  5. 29th July 2012, 08:59 PM #5
    bee utey's Avatar
    bee utey
    bee utey is offline AT REST
    Join Date
    Apr 2009
    Location
    Crafers West South Australia
    Posts
    11,732
    Total Downloaded
    0
    Quote Originally Posted by brendanjjm View Post
    Hi Brendon,

    This sound's similar to my prob, in a way I hope.

    Under accelleration, 2 - 4,000 RPM my 3.9lt 1992 Rangie coughs and spits air out the airfilter.

    I am quite confused but doubt it's the mass airflow meter, could be wrong of course.

    Has anyone had this issue and were able to fix it?

    Cheers, Brendan
    Low fuel pressure or a faulty MAF could result in lean mixtures, but a faulty MAF generally results in very poor idle. Weak ignition will also cause similar problems, poorly set plugs, ignition advance seized or broken, weak coil, dud leads, weak ignition amplifier etc.

    Low fuel pressure can be tested for, fuel pumps can be replaced by VN-on Commodore aftermarket Bosch pumps, ignition amps can be upgraded, coils, leads, timing advance are all things to look at.

    Bosch ignition amp upgrade thread here:

    http://www.aulro.com/afvb/technical-...sch-024-a.html
    Reply With Quote Reply With Quote
  6. 29th July 2012, 10:17 PM #6
    brendanjjm Guest

    Thank's Bee Utey

    Cheers mate, I try out your advice over the next couple of days and let you know.

    Very helpful thank you

    Brendan
    Reply With Quote Reply With Quote
  7. 5th August 2012, 01:06 PM #7
    alltrans
    alltrans is offline Fossicker
    Join Date
    May 2007
    Posts
    34
    Total Downloaded
    0
    Just to add......hairline crack in Distributor Cap, will cause "missing under load", and irregular running.....
    Reply With Quote Reply With Quote
  8. 5th March 2013, 08:56 PM #8
    trubritbiker Guest
    Did any one resolve their missfire problem as it sounds identical to what my Rangie is doing at the moment.
    Reply With Quote Reply With Quote
  9. 7th March 2013, 10:07 AM #9
    brend0n
    brend0n is offline Master
    Join Date
    May 2008
    Location
    Rockhampton
    Posts
    275
    Total Downloaded
    0
    can't remember what I did for this time (think might have been fuel filter),
    but had it playing up again recently, with all the rain in Rocky it was just a simple case of moisture in the dizzy.
    Reply With Quote Reply With Quote
« wiring diagram 87 and 93 rrc | NO OIL PRESSURE :EEK: »

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules

Search AULRO.com ONLY!
 Search All the Web!