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3.9 idling waaay too high

Tech Talk for Rover owners.

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3.9 idling waaay too high

Post by igould »

My 3.9 manual has been idling recently at around 2400rpm. It seems to occur at random from start up, either on gas or on petrol.
Sometimes it will drop in stages back down to normal if I get stuck at a red light for a long time, but mostly it just continues idling high.
This is not too good around town, but a real pain on muddy down hill descents.
Any clues?

Thanks,
Ian
77 Rangie Classic 4.4v8 manual, 2" spring lift, 2" body lift
97 Disco 3.9v8 manual
00 Disco Td5 auto
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Post by fridgefreezer »

Idle air valve sticking would be a good start - I think it's on the back of the plenum on yours. Unscrew, squirt with WD40, replace.
[url=http://www.juracid.co.uk/lr]109 in a million pieces - it shall rise again![/url]
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Post by RaginRover »

fridgefreezer wrote:Idle air valve sticking would be a good start - I think it's on the back of the plenum on yours. Unscrew, squirt with WD40, replace.
Two things, don't try and unwind it or open up the spring just use carby cleaner or wd40.

The other thing is if that doesn't work turn the Idle Bypass valve in 1/4 of a turn and see how you go

Tom
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Post by POS »

Also have you had the computer disconnected for any reason latly?

If so it could just be resetting itself.

It usually takes my buggy 30 restarts to get it right again.

If not, like the others have said, idle air control valve!
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Post by Philip A »

I would be looking at a dirty throttle blade. Get some carby cleaner and give her a thorough doing .
Regards Philip A
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