Australian Land Rover Owners

Gallery Donate Games Arcade Calendar Markets Shop Chat Subscribe! Files Links
Go Back   Australian Land Rover Owners > The Pinnacles > Discovery > Discovery 1

Discovery 1 Chat specifically relating to Discovery 1's (1989-1998) "Project Jay"

Thread Tools Display Modes
  #1 (permalink)  
Old 24th November 2009, 01:11 PM
Join Date: Nov 2009
Location: queensland
Posts: 9
Thanks: 0
Thanked 0 Times in 0 Posts
how to adjust idle?

Hey all..

is there a way to adjust the idle on a v8 discovery, basically when i start mine up.. it will rev low and occasionally turn off when cold, you have to hold the revs up abit otherwise she will stall... on idle it sits at about 550rpm, which i assume is too low...
Reply With Quote
Sponsored Links
  #2 (permalink)  
Old 24th November 2009, 01:24 PM
4bee's Avatar
Join Date: Jan 1970
Location: Adelaide Hills. South Australia
Posts: 1,970
Thanks: 4
Thanked 100 Times in 86 Posts
3.5 or 3.9 Efi?
Reply With Quote
  #3 (permalink)  
Old 24th November 2009, 05:01 PM
Join Date: Jan 1970
Location: Avoca Beach
Posts: 10,004
Thanks: 335
Thanked 2,935 Times in 2,297 Posts
Both the 3.5 and 3.9 have 14CUX so the issue is the same.

The idle is controlled by the ECU so you cannot/should not adjust it. the air let through is controlled by the stepper motor which is controlled by the ECU.

The first thing to look at will be the ECU temp sensor to see if it is giving the correct signal to the ECU. When hot it should show 300 Ohms or thereabouts and cold much more maybe 1000 Ohms. The sensor is the one behind and to the right of the thermostat and it has an injector plug on it .

The next thing to look at at would be the stepper motor, which is that thing on the RH back of the Plenum chamber with 4 wires running to it. Carefully remove the plug, unscrew the stepper and clean the cone shaped thing with carby cleaner and put some on a qtip and clean inside the housing.
Maybe also take of teh pipe from the MAF to the throttle and clean around the throttle plate with carby cleaner and a rag.

Try that first and report the outcome.

Regards Philip A
Reply With Quote
The Following User Says Thank You to PhilipA For This Useful Post:
cucinadio (24th November 2009)

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Search ONLY!
Search All the Web!

All times are GMT +10. The time now is 06:11 PM.

Powered by vBulletin®
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2
Copyright 2001 - 2016
Independently Owned and Operated by
Dave Blears Computing - DavecandoIT
LAND ROVER and its logo are the registered trademarks of Land Rover.
Land Rover is not affiliated with