Results 1 to 6 of 6

Thread: 3.9 V8 high idle between gear shifts

  1. 24th January 2014, 08:38 PM #1
    B92 8NW
    B92 8NW is offline YarnMaster
    Join Date
    Jan 1970
    Location
    VIC
    Posts
    3,536
    Total Downloaded
    0

    3.9 V8 high idle between gear shifts

    Hi all

    I had a few problems with my 3.9 Disco, mainly rich running and erratic idle. After a search on here I cleaned the stepper motor, the MAF (which was filthy) and hit all the sensor connections with contact cleaner. The rich running has cured and it settles down to idle quite nicely now. When shifting between gears however, the idle stays around 1500rpm. It drops down after a few seconds. I've checked throughly for air leaks. Where else should I be looking?
    Reply With Quote Reply With Quote
  2. 24th January 2014, 10:21 PM #2
    jakerrc's Avatar
    jakerrc
    jakerrc is offline Member
    Join Date
    Sep 2013
    Location
    perth
    Posts
    2
    Total Downloaded
    0
    hi mate, check the throttle linkages/springs and cable on the inlet manifold, my discovery was doing the same thing and i found them to be dry and not returning properly, bit of grease spray sorted it out
    Reply With Quote Reply With Quote
  3. 24th January 2014, 10:55 PM #3
    Boony73 Guest
    How old are your leads, plugs, rotor and cap? also do a search on the site for Bee utey's bim024 upgrade, it may not solve your problem but it certainly won't hurt and your economy may improve.
    Reply With Quote Reply With Quote
  4. 25th January 2014, 08:53 AM #4
    PhilipA
    PhilipA is offline Swaggie Subscriber
    Join Date
    Jan 1970
    Location
    Avoca Beach
    Posts
    14,152
    Total Downloaded
    0
    The idle should stay up at about 1100 in neutral if the car is moving, so it will do that.
    Most people don't notice but once you notice you become OBSESSED.

    This is programmed into most injected cars. In an auto it is to smooth the change down to first when stopping, but several manuals I have had have done the same thing. Probably for emissions.

    AFAIK the signals to ECU are revs under 1500 so injectors on, signal from VSS, and TPS less than .49 volts. IE idling when moving.
    Regards Philip A
    Reply With Quote Reply With Quote
  5. 25th January 2014, 10:48 PM #5
    Roverlord off road spares
    Roverlord off road spares is offline AT REST
    Major part of the heart and soul of AULRO.com
     Vendor

    Subscriber
    Join Date
    Jul 2012
    Location
    Tecoma Vic
    Posts
    9,642
    Total Downloaded
    0
    May be the TPS is sticking, have you cleaned the inside of the throttle throat and TPS.

    Reply With Quote Reply With Quote
  6. 26th January 2014, 02:58 PM #6
    B92 8NW
    B92 8NW is offline YarnMaster
    Join Date
    Jan 1970
    Location
    VIC
    Posts
    3,536
    Total Downloaded
    0
    I lubed up all the linkages and cleaned out the throat and TPS. Seems to only do it now for the first km or two until it warms up a bit. Running beautifully otherwise!! Loving the V8 versus the Tdi
    Reply With Quote Reply With Quote
« td5 going forward | TD5 oil pump failure, Warning signs. »

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!