Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: GmasterT on 27 September 2015, 15:12:00

Title: Random drop in revs/cut out
Post by: GmasterT on 27 September 2015, 15:12:00

Hello all. New purchase (auto v6) has a few niggles in trying to address.

The main one is that I think it ticks over a little high and every so often it drops the revs and then picks up again. Sometimes it drops and cuts out, but it generally decides to do that when you're trying to pull out of a junction  ::) obviously!
Other than that it does seem to be 'dragging' on the gearbox slightly when doing this so I have to knock it in to N. (This may be why I'm having gearbox issues but one step at a time!)

I've checked for air leaks both with eyeball mk1 and brake cleaner spray and nothing obvious. Another suspicion is possibly faulty coolant temp sensor as may be over fuelling?

Anyway, any ideas? :)

Title: Re: Random drop in revs/cut out
Post by: minifreek on 27 September 2015, 15:56:50

Id suspect the ICV meself, this is what mine did on my 2.5 V6 but you don't say what engine you have...

Title: Re: Random drop in revs/cut out
Post by: GmasterT on 27 September 2015, 15:59:04

Swapped that for a known good one :)

It's essentially a 3.0 (well a 3.2 on 3.0 management)

Maybe afm is worth a go? Swapped the intake air temp sensor already too

Title: Re: Random drop in revs/cut out
Post by: Rods2 on 27 September 2015, 19:24:16

Worth checking all of the vacuum pipes especially the rubber T joints and bends as they can perish over time. Iirc some people on here have had problems with servo leaks.

Title: Re: Random drop in revs/cut out
Post by: GmasterT on 28 September 2015, 12:14:03

Yeah, that was going to be my next step I think. Thanks :)

Title: Re: Random drop in revs/cut out
Post by: 2nddaniel on 28 September 2015, 23:04:26

Does your car have air con?

Title: Re: Random drop in revs/cut out
Post by: 05omegav6 on 29 September 2015, 01:10:56

Is the TC light flashing when the power drops?

Title: Re: Random drop in revs/cut out
Post by: GmasterT on 30 September 2015, 19:34:04

Has air con but it's out of action at the mo due to leaky hard pipe

No tc light

Does the same on petrol and gas

Did some plugging in, reckons dodgy rpm signal so crank/cam sensor?

Title: Re: Random drop in revs/cut out
Post by: 2nddaniel on 01 October 2015, 23:21:46

Bit of a long shot, but pull the fuse to prevent the air con compressor from running and see if the problem goes away.
I had the stalling happen to me, but I had 2 simultaneous problems. 1 was no air con gas after a leak - I think the compressor still kicks-in occasionally. I also had a weak battery - since the alternator is intelligent and only charges when needed, it drops the engine revs as it begins charging again.
I was never able to prove it, but one or both of these was happening at traffic lights, roundabouts etc, and stalling the engine.
But now since the air con was repaired and a new battery fitted - no stalling.
See what you think.