Mud-club

Vehicle & Technical => Range Rover => Topic started by: Merlin on November 21, 2006, 11:12:08

Title: High revving
Post by: Merlin on November 21, 2006, 11:12:08

My RRC revs high-1800-on start up & also at times when I pull up & put it in neutral.  I have cleaned the Stepper Switch/motor thoroughly with carb cleaner & then WD 40'd it.  It is better since then as it drops down to normal tick over almost straight away but I certainly dont like a cold engine revving high on start up before the oil gets around bearings etc.
Anything else to try to get it to start up with less revs?
Apart from this problem it runs great & has recently cleaned plugs,new dizzy cap & leads, air & fuel filters, new pipe from the tank to the filter.
Cheers-Merlin

Title: High revving
Post by: Range Rover Blues on November 22, 2006, 13:56:02

Try checking the base idle speed.

Title: dumb question from newbie
Post by: boatboy on March 30, 2007, 17:55:00

my rrc is reving about 1800 on start up and somtimes continues for several miles, sometimes when it feels like it.
where is the step motor located?
any help much appreciated.

Title: High revving
Post by: Range Rover Blues on April 01, 2007, 13:18:03

Stepper motor at the back of the plenum, driver's side.  4 wires go to it from the EFi loom and it screws into a housing.

If you leave the ignition on for a while you might hear it cycle through a sort of self-test once in a while.

Title: High revving
Post by: Rossko on April 01, 2007, 23:01:36

Assuming this a hotwire EFi, the ECU has a little trick of upping the idle speed to 1500-odd rpm when the battery volts is low.  It's just possible you have a wonky charge from alternator occasionally.  Maybe a clue if the headlights seem a bit dim sometimes and then perk up again?

cheers, Ross K

Title: High revving
Post by: Range Rover Blues on April 03, 2007, 17:26:32

Didn't know that :)  might be worth sticking a voltage meter in your car, perhaps into the cig lighter for now.

Title: High revving
Post by: Garth on April 04, 2007, 22:53:49

Mine does same when it is warm starts and then instantantly revs up to approx 1500-1800 RPM for a approx 10 seconds then calms down to 1000 ish. Then drops to 700-800

I have tried starting on petrol and gas and does same??

When its cold starts as you would expect.

Title: High revving
Post by: Range Rover Blues on April 05, 2007, 12:57:36

I've got to be honest, mine does that too and I don't give a ****.

I understand that a faulty road speed sensor can cause this and my truck hasn't got one, which would definitely class it as faulty :lol:

Title: High revving
Post by: Garth on April 06, 2007, 10:11:10

Well if its not there it wont break :D  :D

My concern is that on a bad day the bottom end grumbles with the higher starting revs

Title: High revving
Post by: Range Rover Blues on April 06, 2007, 13:06:09

True, I tend to think that running a fast idle will get the oil there faster, but it's swings and roundabouts.  I use Lucas oils with the added stabiliser, it helps protect the bottom end on first-start, a bit like magnetec but without the gold-plated bottle.