Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: Smooth on 21 March 2010, 20:05:42

Title: Erratic idle at times??
Post by: Smooth on 21 March 2010, 20:05:42: Hello again folks,my 2.6 mv6 seems to be revving up alot recently,esp when i come to road ends or pulling in to my driveway,doesnt matter when hot or cold.It usually revs up to around 2500/3000 revs and sits like that until i ride the clutch etc,i have recently cleaned out the throttle bodies(which were not overly bad) and no difference,what is the electrical unit on side of throttle body and is it possible to open it and clean it also,any help appreciated as it doesnt seem to be as quick as usual.Cheers
Title: Re: Erratic idle at times??
Post by: Ghost on 21 March 2010, 20:11:40: Have you cleaned your icv? ( if you have one.)
check that it is not pulling in any extra air, ie split or worn pipe.
Title: Re: Erratic idle at times??
Post by: joshwyatt on 21 March 2010, 20:14:28: I think the first port of call would be to do the pedal trick, to see if any codes are present. That would give you a good base to start from :y
Title: Re: Erratic idle at times??
Post by: Smooth on 21 March 2010, 20:21:45: i have acces to a snap on scanner,it only ever reads up fuel trim malfunction which is due to cats being removed,the car has only recently started doing this,does anyone know where the idle valve is on a 01 2.6mv6,i have also checked vacuum pipes etc and they seem ok
Title: Re: Erratic idle at times??
Post by: Andy B on 21 March 2010, 20:28:36: Quote
...
what is the electrical unit on side of throttle body and .....

Not sure of the correct term, but it's the motor that does the opening of your throttle, the DBW throttle 'talks' to it. :y :y :y
Title: Re: Erratic idle at times??
Post by: Smooth on 21 March 2010, 20:59:01: would dirty egr valve cause this? or does anyone know where the idle valve is located,cheers
Title: Re: Erratic idle at times??
Post by: Andy B on 21 March 2010, 21:02:03: Quote
would dirty egr valve cause this? .....
Definitely not on your car! ::)

Quote
or does anyone know where the idle valve is located,cheers

You don't have one! :y :y
Title: Re: Erratic idle at times??
Post by: Smooth on 21 March 2010, 21:09:46: Cheers mate,at least thats 2 things eliminated lol :y
Title: Re: Erratic idle at times??
Post by: Andy B on 21 March 2010, 21:13:24: Quote
Cheers mate,at least thats 2 things eliminated lol :y

I've tried to find pictures of the differences, I'm sure they're there somewhere. EGR when fitted is on the driver's side of the plenum, IACV is on the other side. :y :y :y. Both items dropped with DBW. ;)
Title: Re: Erratic idle at times??
Post by: Andy H on 21 March 2010, 21:17:36: (http://images.omegaowners.com/images/techinfo/v6enginebay/v6enginebay.jpg)

(http://images.omegaowners.com/images/techinfo/v6enginebay/enginebayV6FACELIFT.jpg)
Title: Re: Erratic idle at times??
Post by: Andy B on 21 March 2010, 21:21:23: Thanks Andy H :y
Title: Re: Erratic idle at times??
Post by: Andy H on 21 March 2010, 21:26:22: Don't thank me, thank TheBoy :y V6 engine layout (http://www.omegaowners.com/forum/YaBB.pl?num=1189893357)
Title: Re: Erratic idle at times??
Post by: Andy B on 21 March 2010, 21:26:56: Quote
Don't thank me, thank TheBoy :y V6 engine layout (http://www.omegaowners.com/forum/YaBB.pl?num=1189893357)

I didn't look properly. :-[ ;)
Title: Re: Erratic idle at times??
Post by: Smooth on 21 March 2010, 21:27:35: cheers andys :y
Title: Re: Erratic idle at times??
Post by: Smooth on 22 March 2010, 20:30:24: Still revving up at times,gonna try cleaner the breather pipes at weekend
Title: Re: Erratic idle at times??
Post by: vbelen4 on 22 March 2010, 21:20:18: Time ago I experienced erratic idle. Discarded ICV, etc, finally it was due to a defective ECU temp sensor.
Title: Re: Erratic idle at times??
Post by: Smooth on 23 March 2010, 20:55:18: also tried cleaning the breather pipes and no avail,doing my rather head now,no codes present,have tried a bottle of engine treatment in the tank today,hope this helps,anyone any ideas....cheers
Title: Re: Erratic idle at times??
Post by: Andy H on 23 March 2010, 21:39:17: Has anyone got Tech2 or "My Naff Code Reader" in NI who can look at live data for you?

When SWMBO got a Golf last year it had similar symptoms. I spent ages checking for air leaks before getting a tool to read live data which told me that the throttle wasn't closing when it should.

Turned out that some clown had glued a sliver of wood inside the throttle motor to prevent it closing properly. This had been done to mask a stalling problem caused by a faulty temperature sensor >:(

Removed the wood, replaced the temperature sensor and cleaned out the breathers and order was restored :y

I would start by checking that there isn't a problem with the brake servo or the vacuum pipe. I can think of other things it might be (temperature sensor, throttle motor) but it doesn't make sense to swap things unless they are known to be faulty.