Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: sjc on 18 June 2013, 20:01:46

Title: 3L V6 cutting out when hot (intermittent)
Post by: sjc on 18 June 2013, 20:01:46

Being having this problem for a few months now where the engine cuts out at roundabouts/junctions/etc when its warmed up and refuses to idle until you give it a minute or two to cool down just a little.

I'm also getting the EML light coming on at high revs (circa 6-7k) with code 74 MAF voltage high.  Not at all convinced this is related but I'm going to get another one to try.

I've already changed the IACV, replaced the crank sensor (with genuine GM one), cleaned breathers, switch cleaner on the plug.

Any other common causes?

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: chrisgixer on 18 June 2013, 22:03:09

Any codes?

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: RobG on 18 June 2013, 22:17:56

Quote from: chrisgixer on 18 June 2013, 22:03:09

Any codes?

Quote

I'm also getting the EML light coming on at high revs (circa 6-7k) with code 74 MAF voltage high

;)

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: chrisgixer on 18 June 2013, 22:38:49

Bah! So this code 74 ;D

Anyone still suspecting crank sensor...?  ( starter for 10 :-\ )

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: dbug on 19 June 2013, 16:16:11

Could still be dodgy crank sensor (I had a duff one from Vx main dealer, worked ok at first then failed very quickly)

Could try disconnecting MAF (just pull leccy plug off) and see if any different.  If cures replace MAF.

Could posssibly be cam sensor (unusual on a V6, but had same symptoms on the 2.6, dealer replaced crank sensor, no change, then replaced cam sensor which cured problem, all under warranty)


 ;)

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: blue_dream on 19 June 2013, 18:06:06

Hi
   it looks like the MAF has failed, should notice a increase in petrol consumption  :)

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: sjc on 21 June 2013, 07:19:18

Quote from: dbug on 19 June 2013, 16:16:11

Could still be dodgy crank sensor (I had a duff one from Vx main dealer, worked ok at first then failed very quickly)

Could try disconnecting MAF (just pull leccy plug off) and see if any different.  If cures replace MAF.

Could posssibly be cam sensor (unusual on a V6, but had same symptoms on the 2.6, dealer replaced crank sensor, no change, then replaced cam sensor which cured problem, all under warranty)


 ;)

Yeah, know what you mean about new crank sensor but I'd be surprised if 2 fail in exactly the same way.

Thanks for suggestions on MAF and cam sensor.  I'll check those out.

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: sjc on 21 June 2013, 07:20:04

Quote from: blue_dream on 19 June 2013, 18:06:06

Hi
   it looks like the MAF has failed, should notice a increase in petrol consumption  :)

Cheers, gonna try another MAF and see what happens.

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: sjc on 21 June 2013, 07:21:32

Surprised no-one has mentioned EGR valve to be honest, but just as well because it's been "disposed of" LOL.

Cheers for replies.

Title: Re: 3L V6 cutting out when hot (intermittent)
Post by: TheBoy on 21 June 2013, 08:35:43

The symptoms and codes point towards a dying crank sensor TBH.

Doubt it would be a EGR.

Of course, it could be the MAF - easy test is to unplug and see if symptoms remain (performance will be slightly reduced, as the ECU guesses at the engine load)