Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Debs. on 27 March 2011, 21:04:19

Title: Idle: surging up and down.
Post by: Debs. on 27 March 2011, 21:04:19

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?  :-/

Title: Re: Idle: surging up and down.
Post by: davethediver on 27 March 2011, 21:09:49

Possibly Miss Debs or maybe an air leak somewhere :-/

Title: Re: Idle: surging up and down.
Post by: gstylebaby on 27 March 2011, 21:22:24

Quote

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?  :-/

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. :y

Title: Re: Idle: surging up and down.
Post by: davethediver on 27 March 2011, 21:32:31

Quote

Quote

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?  :-/

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. :y

Will any other bitter do :D ;D ;D

Title: Re: Idle: surging up and down.
Post by: cem_devecioglu on 27 March 2011, 22:25:31

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.. :y

ps: if you have egr and not blocked it (with metal) clean it with wd40 not thinner..

Title: Re: Idle: surging up and down.
Post by: hotel21 on 27 March 2011, 22:52:24

I would be blaming the idle control valve...  ;)

Title: Re: Idle: surging up and down.
Post by: Debs. on 27 March 2011, 23:09:43

Thank you for the replies, chaps! :y

.....I will pull the valve, give it a Spring clean and report back. ;)

Title: Re: Idle: surging up and down.
Post by: cem_devecioglu on 27 March 2011, 23:12:25

Quote

Thank you for the replies, chaps! :y

.....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..  :y

Title: Re: Idle: surging up and down.
Post by: STRAWB on 28 March 2011, 10:38:48

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  :o Any thoughts peolpe. Does this sound like the same beastie or something else. Thanks  :y

Title: Re: Idle: surging up and down.
Post by: amba on 28 March 2011, 12:36:20

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 .

Title: Re: Idle: surging up and down.
Post by: STRAWB on 02 April 2011, 13:45:00

Thank you Amba will do that and check the ICV  :) Fingers crossed then  :y