Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: omegatech on 09 August 2009, 21:48:00

Title: engine running rough
Post by: omegatech on 09 August 2009, 21:48:00

hi there all

please can somebody help me i did my rocker cover gaskets today on my v6 and after many hours of doing the job i put the engine back together the exact way i had taken it  apart.
and when i started it up it started up no problems but after about 5 seconds it started to idle rough not as smooth as before. i cleaned all the breathers and the idle air control valve. i have gone over everything i done but cannot seem to find why it is doing it.
please help

Title: Re: engine running rough
Post by: Lizzie_Zoom on 09 August 2009, 21:50:09

Have you trapped a wire, at the front of the right hand passenger bank??

I did exactly that and got the same results!  Very easy to do as the cable is black! ::) ::) ::)

Do a paperclip test if not ;) ;)

Title: Re: engine running rough
Post by: TheBoy on 09 August 2009, 22:12:19

any fault codes stored?

Title: Re: engine running rough
Post by: omegatech on 12 August 2009, 12:51:24

hi there

thanks for your replies

i know the wire you mean as it did play me up a bit  :'(  but i did manage to get it away enough to put the cover back on.
i will do the paper clip test as soon as it dries up abit.
i was also told to change the spark plugs and ht leads as the oil could have damaged them due to the oil covering them.

Title: Re: engine running rough
Post by: Welung666 on 12 August 2009, 13:47:13

It could be the leads/dispack but could also be an air leak at the plenum O rings. Any hissing noises round the plenum area with it ticking over?

Title: Re: engine running rough
Post by: omegatech on 13 August 2009, 13:09:22

hi there

i started my engine to listen for any noises and there is a loudish type of rushing air sound could that be the o rings below the plenum come loose or out seated.

Title: Re: engine running rough
Post by: omegatech on 13 August 2009, 13:10:32

sorry

the sound of the rushing air seems to be coming from the plenum end.
cheers

Title: Re: engine running rough
Post by: Welung666 on 13 August 2009, 13:35:13

Have you got any easy start or brake cleaner spray? If you have try a tiny squirt under the plenum near each cylinder. If the revs increase slightly on any of the pots then there is extra air getting in through the O ring :y

Title: Re: engine running rough
Post by: omegatech on 13 August 2009, 18:58:20

hi there again

BINGO :) just to let you know the problem has been found after checking all the plenum rings and found they were all ok i decided to put it all back together and do it another day.
but it was when i was putting the top breather box back on i noticed the seal was missing where it fits into the top of the plenum after finding the seal thank god i fitted it back on the breather box and the 2 o rings were also damaged so i made a couple temporarily til i go to vauxhall and hey presto no rough idling.

many thanks to everyone for your help