Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Webby the Bear on 03 August 2013, 11:50:21
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Hi guys,
stopped at some traffic lights yesterday. car died. as if it had stalled. put in park, restarted. no problem. didn't think any more of it.
it did exactly the same today.
car idles lovely at 400rpm but have noticed it's jumping lately.... not too much.... but could it be dropping enough to stall the engine? so an ICV clean needed?
any other ideas?
cheers
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Read codes, either crank sensor failing or ICV sticky :y
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Read codes, either crank sensor failing or ICV sticky :y
that's what I thought, cheers tunnster :y :y :y
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Also, 400RPM is quite low. I'd be expecting 600RPM, or slightly higher with A/C on. :y
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a/c is always off :) I have it on eco :)
will there be codes I can read via paperclip even though the EML isn't on?
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a/c is always off :) I have it on eco :)
I would leave it auto, keeps the compressor ticking over in the background. Leave it off for too long and it could cause issues as it may dry up / seize.
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a/c is always off :) I have it on eco :)
Tut tut ....As Tunnie says, besides, how economical can a 2.5 V6 be? ::) ;) ;)
will there be codes I can read via paperclip even though the EML isn't on?
Wouldn't do any harm, but I doubt there's be anything. Give the idle control valve a good clean out with carb cleaner/similar & a finish of with a squirt of light oil in there. :y
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thanks for the tips boys. if theres no codes and I clean the ICV and still happens... am I ok to just go ahead and replace the CPS? :)
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Mine was doing the same recently, turned out to be the MAF.
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thanks for the tips boys. if theres no codes and I clean the ICV and still happens... am I ok to just go ahead and replace the CPS? :)
I think the EGR (exhaust gas recirculation) valve is another possible culprit. Not sure if that can be cleaned :-\
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thanks for the tips boys. if theres no codes and I clean the ICV and still happens... am I ok to just go ahead and replace the CPS? :)
I think the EGR (exhaust gas recirculation) valve is another possible culprit. Not sure if that can be cleaned :-\
The EGR can be tested by disconnecting it. It will bring on the engine management light but will run as normal. If stalling stops, then you've found the problem. EGR can be blanked off, there's plenty info on this on here. You can also install an EGR cheater to keep it disconnected but put the light out - info on here about that too.
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Similar with MAF. If the problem goes away when you unplug it,then the MAF is the problem. :y
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When the crank sensor went on mine I had similar symptoms to Webbys, although as others have said there are many other possibilities, get the codes read :y
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Read the codes Webs. ;)
Firstly I'd clean ICV and check breathers clear.
As said try with MAF disconnected as diagnostic.
Then consider replacing Crank Sensor (your symptoms are the same as mine before my C/S went completely)
With a/c off, your idle speed on a 2.5V6 should be a steady 500rpm ;)
HTH ;)
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Ac on will open the Icv more to increase the tick over to account for the extra load of the ac pump.
The Dbw cars hold a constant 600rpm regardless of ac on so don't compare the performance of the two IMO.
But, ime, you have typical icv issue. Clean and light oil. Might need several cleans to take effect. (Dont be tempted to open the valve with a screw driver or metal object like I did, as it will easily chip and then stick. ::) :-[ ;D )
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Ac on will open the Icv more to increase the tick over to account for the extra load of the ac pump.
The Dbw cars hold a constant 600rpm regardless of ac on so don't compare the performance of the two IMO.
But, ime, you have typical icv issue. Clean and light oil. Might need several cleans to take effect. (Dont be tempted to open the valve with a screw driver or metal object like I did, as it will easily chip and then stick. ::) :-[ ;D )
2.5 V6 isn't dbw ;) - so tickover with a/c off should be 500rpm, 600rpm with a/c on
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Does sound like ICV, so thats first port of call.
2.5/3.0 tickover should be 450 (AC off) or 550 (AC on), and rock steady.
2.6/3.2 tickover should be 600 irrespective of AC setting, and tends to be slightly lumpy.
Given the failure modes of MAFs on 2.5/3.0, I'd not immediately be suspecting that, but if you do want to unplug it, ensure you read the codes beforehand, as the MAF will store another if you unplug.
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thanks for all the infi guys. going to crack on with a few things you mention today - drove it already today and it hasn't acted up yet ::)
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Sounded sweet when i was in it ... Italian tune up required :y
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Stop driving it like a granny and dire it like you just stole it ;D
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you may have hit the nail on the head there. I do drive very sloooow :(
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Ac on will open the Icv more to increase the tick over to account for the extra load of the ac pump.
The Dbw cars hold a constant 600rpm regardless of ac on so don't compare the performance of the two IMO.
But, ime, you have typical icv issue. Clean and light oil. Might need several cleans to take effect. (Dont be tempted to open the valve with a screw driver or metal object like I did, as it will easily chip and then stick. ::) :-[ ;D )
2.5 V6 isn't dbw ;) - so tickover with a/c off should be 500rpm, 600rpm with a/c on
I know, it was being compared to a 3.2 earlier. Very different. As you and i are saying.