Omega Owners Forum - Idle: surging up and down.

Debs.

Omega Lord

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A denizen of The Wirral
peninsula

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Drives: 2.5 V6 CDX Estate (1999)

Idle: surging up and down.
27. Mar 2011 at 21:04

I`ve noticed recently that the normally smooth idle on my `99 2.5 V6 will sometimes drop then immediately surge up to (circa) 800-900 rpm, then settle back to normal.....often, it`s only once or twice at traffic lights during a journey.
There are no codes showing and in all other respects the car drives and responds smoothly; as per usual.

Would the idle-valve be a likely suspect?......if so, may it be cleaned/serviced? Undecided

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davethediver Omega Knight Offline Posts: 1323 Blackburn, Lancs. Gender: Drives: 2.2 CD Facelift (2001)	Re: Idle: surging up and down. Reply #1 - 27. Mar 2011 at 21:09 Possibly Miss Debs or maybe an air leak somewhere
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gstylebaby

Omega Knight

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Ever dance with the devil
in the pale moon light

Posts: 1118
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Drives: B16 HNK 3.0L Elite saloon + Essay 3.0L Mv6 estate

Re: Idle: surging up and down.
Reply #2 - 27. Mar 2011 at 21:22

Debs. wrote on 27. Mar 2011 at 21:04:

I`ve noticed recently that the normally smooth idle on my `99 2.5 V6 will sometimes drop then immediately surge up to (circa) 800-900 rpm, then settle back to normal.....often, it`s only once or twice at traffic lights during a journey.
There are no codes showing and in all other respects the car drives and responds smoothly; as per usual.

Would the be a idle-valve be a likely suspect?......if so, may it be cleaned/serviced? Undecided

It could be debs i cleaned mine out with i.p.a but double check with someone who is more in the know than me....It has not damaged mine any. Thumbs Up!

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« Last Edit: 27. Mar 2011 at 21:23 by gstylebaby »

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davethediver

Omega Knight

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Posts: 1323
Blackburn, Lancs.
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Drives: 2.2 CD Facelift (2001)

Re: Idle: surging up and down.
Reply #3 - 27. Mar 2011 at 21:32

gstylebaby wrote on 27. Mar 2011 at 21:22:

Debs. wrote on 27. Mar 2011 at 21:04:

I`ve noticed recently that the normally smooth idle on my `99 2.5 V6 will sometimes drop then immediately surge up to (circa) 800-900 rpm, then settle back to normal.....often, it`s only once or twice at traffic lights during a journey.
There are no codes showing and in all other respects the car drives and responds smoothly; as per usual.

Would the be a idle-valve be a likely suspect?......if so, may it be cleaned/serviced? Undecided

It could be debs i cleaned mine out with i.p.a but double check with someone who is more in the know than me....It has not damaged mine any. Thumbs Up!

Will any other bitter do Cheesy

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“It is not necessary to understand things in order to argue about them.”
P.A. Caron de Beaumarchais

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cem Omega King Offline Posts: 13920 Ankara/Turkey Gender: Drives: 97 2.5 V6 Manual CD- Clio Sport	Re: Idle: surging up and down. Reply #4 - 27. Mar 2011 at 22:25 idle valve , soak in injector cleaner or thinner let rest for some hours then clean by shaking (filled with cleaner) in every direction.. open its valve and clean around as much possible.. ps: if you have egr and not blocked it (with metal) clean it with wd40 not thinner..
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hotel21 Administrator Offline Posts: 12766 Doghouse Gender: Drives: into lamposts	Re: Idle: surging up and down. Reply #5 - 27. Mar 2011 at 22:52 I would be blaming the idle control valve...
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Debs. Omega Lord Offline A denizen of The Wirral peninsula Posts: 7386 Gender: Drives: 2.5 V6 CDX Estate (1999)	Re: Idle: surging up and down. Reply #6 - 27. Mar 2011 at 23:09 Thank you for the replies, chaps! .....I will pull the valve, give it a Spring clean and report back.
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cem Omega King Offline Posts: 13920 Ankara/Turkey Gender: Drives: 97 2.5 V6 Manual CD- Clio Sport	Re: Idle: surging up and down. Reply #7 - 27. Mar 2011 at 23:12 Debs. wrote on 27. Mar 2011 at 23:09: Thank you for the replies, chaps! .....I will pull the valve, give it a Spring clean and report back. even brand new icv s needs cleaning after some time and from time to time Debs..
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STRAWB

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Posts: 15

Drives: omega 2.0GLS

Re: Idle: surging up and down.
Reply #8 - 28. Mar 2011 at 10:38

Glad you ve posted this one Debs. Sounds like the exact same issue I have with my 2.0 GLS. Always on a cold engine and always in stop start traffic it idles above and below 1000rpm erratically and when Ive needed to apply my handbrake and got to Park (I have an auto) it will rev up to 2500 rpm with no assistance from me!! Very worrying Shocked

Any thoughts peolpe. Does this sound like the same beastie or something else. Thanks Thumbs Up!

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amba

Omega Baron

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Posts: 2151
Medway towns
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Drives: 1998 2.5 Elite Auto saloon.Fitted with 3.0 cams and Irmscher Alloys.

Re: Idle: surging up and down.
Reply #9 - 28. Mar 2011 at 12:36

Un-metered air getting in somewhere.

Check all pipes for splits and also worth going around the top of the engine with some carb cleaner.Give it a gentle spray on all metal/metal joins and around air pipes to see if engine speed increases.If this does happen you have found the source of the air leak as carb cleaner is being drawn into engine.

ICV worth a good clean every so often,but it sound more of a air leak to me .

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STRAWB Newbie Offline Posts: 15 Drives: omega 2.0GLS	Re: Idle: surging up and down. Reply #10 - 02. Apr 2011 at 13:45 Thank you Amba will do that and check the ICV Fingers crossed then
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