Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: max23261 on 23 October 2007, 19:11:32

Title: idle problem
Post by: max23261 on 23 October 2007, 19:11:32

Hi,  I had an idle prob a few weeks ago when stationary the revs would go up then down.i guessed it was something to do with the icv so i bought one and fitted it. All was ok for a few days but now its back and worse than ever the engine cuts out nearly everytime i stop and i have also noticed a flat spot when starting off in first which wasnt there before. Any suggestions to whats wrong guys.

thanks max.

Title: Re: idle problem
Post by: TheBoy on 23 October 2007, 19:23:53

Update your profile to show your car...

Title: Re: idle problem
Post by: Dazzler on 23 October 2007, 19:31:33

As The Boy has said a profile update to include your car would be helpful.
As a fairly common item to cause this, i would suggest the IACV (Idle control valve)

Title: Re: idle problem
Post by: Grumpy on 23 October 2007, 19:38:11

Hi Max23261.

Would help if you filled in your profile with your car details.
Searched your posts and you have a 2.0L CD (Don't know if it's
manual or auto).

Read this thread, and links in it, to ensure that your breather system
is clear and check your fault codes with the paperclip test.

http://www.omegaowners.com/forum/YaBB.pl?num=1193083316

Check that your ICV gasket is in good condition and that your ICV
is still secure with no air leaks going into the mating faces where the
gasket fits. Your Inlet and Outlet slots in the throttle body, either
side of your Butterfly, are vertically aligned and the Inlet/Outlet holes
in your ICV are horizontally aligned. So you're twisting the airflow through
90 degrees. If your gasket is leaking internally or sucking in air from
externally, the ecu will have the devil's own job trying to control your
Idle speed via the ICV.

If all above OK, start looking for unmetered air via leaking Vac tubes.
3 on your Throttle body near the ICV, and the main Vac feed from lower down
on the intake manifold, that feeds your brake servo with tappings off that
to feed your HBV and climate control system.

Title: Re: idle problem
Post by: Grumpy on 23 October 2007, 19:46:20

Hee-Hee.  :) I see you've already been asked to update your profile
whilst I was sorting out my reply to you.

If you don't know how to, go to the clickable link that says 'Profile'
just under the Date at the top of the page.
Follow the steps that you get presented with.

Title: Re: idle problem
Post by: Abiton on 24 October 2007, 08:20:17

Your symptoms sound a bit similar to what my car did a few months back.  I agree with Grumpy, check for stored error codes.  Mine had codes 14 and 15, both to do with a coolant temperature sensor problem (and consequent overfuelling), which had occurred due to some wiring shorts in the trunking along the O/S of the engine.

Clean the breathers first though, it could just be that.

Title: Re: idle problem
Post by: Dave-C on 24 October 2007, 21:41:58

Don't overlook oily plug holes and thus, HT problems at low revs.. DC

Title: Re: idle problem
Post by: max23261 on 01 November 2007, 07:16:42

thanks to everyone for their help.  i removed the icv again and cleaned out all, this time fitting a new gasket which i didnt do the first time around.what a difference the engine is ticking over as it should with no probs.

thanks again to you all.
max :y

Title: Re: idle problem
Post by: carlos_fandango on 01 November 2007, 09:17:09

Hi, If its the 2.0 ecotech, is it cutting out too on idle?
 You may have to clean the breathers etc out too. See http://www.omegaowners.com/forum/YaBB.pl?num=1152787758 it explains how. Its an easy enough job too. ;)
Carlos

Title: Re: idle problem
Post by: Marks DTM Calib on 01 November 2007, 09:28:38

I fear you may have nothing more than a short term fix.

To do the job properly you must remove and fully clean the throttle body, idle valve and ALL the breathers.