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Author Topic: 2.5 Estate fluctuating idle and cutting out  (Read 6003 times)

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steve6367

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #30 on: 13 June 2015, 10:09:22 »
Quote from: TheBoy on 13 June 2015, 09:10:19
I assume you've had all the plugs out and checked them?

Misfires with no fault codes (on 2.5 and 3.0) are generally HT, thus normally DIS, leads or plugs.  You've crossed off DIS already.

I think it was Nick W who said he'd got some cheap, might be worth a  search, or a PM to him ;)

Thank you for the reply - yes no fault codes logged since I changed the crank sensor. I changed the plugs when doing the cam belt, so they are new GM and the wells were clear of oil and water. I will have a search for the HT leads here as suggested  :y

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Nick W

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #31 on: 13 June 2015, 13:45:13 »
I got some cheap from an autojumble last week.
They're not branded, but they're bundled into each side like the originals, marked with the cylinder number and are brand new. At £7.50 for the set it would have been daft not to buy them, especially as the Intermotor ones on the car were about £35 4years ago.
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stuvaux

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #32 on: 13 June 2015, 19:59:04 »

Not sure if this will relate to your problem, but it is very similar in some ways to one I had on my V6 Estate recently.

I had starting problems and bad idling. All sorts of things were checked, including MAF and crank sensor. However, the problem was the fuel pipes coming from underneath the fuel pump cover to the pump (located under boot floor, after removing the metal cover plate) were both split. May be worth a check just to rule it out. It is usually the curved metal pipes on top of the pump cover that corrode and cause a problem.

My original thread is here if you want a look: http://www.omegaowners.com/forum/index.php?topic=122055.0

Stu
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Diamond Black Geezer

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #33 on: 13 June 2015, 20:59:52 »
fair point, worth ruling it out  :y
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steve6367

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #34 on: 14 June 2015, 23:58:18 »
HT leads changed and its good on Petrol one - much better of LPG but still hesitates with quick throttle application....

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05omegav6

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #35 on: 15 June 2015, 00:03:10 »
Quote from: steve6367 on 14 June 2015, 23:58:18
HT leads changed and its good on Petrol one - much better of LPG but still hesitates with quick throttle application....
That'll be the ecu playing catchup :y
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steve6367

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #36 on: 15 June 2015, 09:59:54 »
Quote from: Harris K Telemacher on 15 June 2015, 00:03:10
Quote from: steve6367 on 14 June 2015, 23:58:18
HT leads changed and its good on Petrol one - much better of LPG but still hesitates with quick throttle application....
That'll be the ecu playing catchup :y

The LPG ECU? A feature of LPG that can't be solved?
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steve6367

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #37 on: 15 June 2015, 20:41:07 »
Quote from: steve6367 on 15 June 2015, 09:59:54
Quote from: Harris K Telemacher on 15 June 2015, 00:03:10
Quote from: steve6367 on 14 June 2015, 23:58:18
HT leads changed and its good on Petrol one - much better of LPG but still hesitates with quick throttle application....
That'll be the ecu playing catchup :y

The LPG ECU? A feature of LPG that can't be solved?

Or just some LPG systems?
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steve6367

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #38 on: 16 June 2015, 20:17:27 »
Any LPG experts?
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TheBoy

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #39 on: 16 June 2015, 22:39:07 »
If you get a small hesitation on petrol, piggybank LPG will emphasis and amplify this.
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05omegav6

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #40 on: 16 June 2015, 23:06:08 »
Quote from: Harris K Telemacher on 15 June 2015, 00:03:10
Quote from: steve6367 on 14 June 2015, 23:58:18
HT leads changed and its good on Petrol one - much better of LPG but still hesitates with quick throttle application....
That'll be the ecu playing catchup :y
Sluggish reaction to throttle blip... Might be able to adjust the slop in the cable to minimise the response time, but could equally be an electrical response, or lack of, which as TB says will be exaggerated by the lpg ecu, especially if it's wired up in series rather than parallel... The maps will be slightly different too due to the slight difference in the way the fuel burns ;)
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TheBoy

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #41 on: 17 June 2015, 07:01:30 »
Because the 2.5/3.0 are less prone to (petrol) lags and confuddlement than the DBW replacements, I never notice any LPG lags on my 3.0l.  The 3.2 occasionally hiccups if you confuse it, esp around auto gear changes - does this on petrol, and LPG highlights this.
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steve6367

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #42 on: 17 June 2015, 08:32:25 »
Quote from: TheBoy on 17 June 2015, 07:01:30
Because the 2.5/3.0 are less prone to (petrol) lags and confuddlement than the DBW replacements, I never notice any LPG lags on my 3.0l.  The 3.2 occasionally hiccups if you confuse it, esp around auto gear changes - does this on petrol, and LPG highlights this.

Thank you both - after the dispack / HT leads / plugs / crank sensor it seem fine of Petrol - I can put the peddle to the floor as quickly as I can on Petrol and it just takes off without hesitation. ON LPG from idle you need to pickup revs slowly initially - once revving you can then boot it without difficulty.

Would Tech 2 help? Or do I need to be connecting to the LPG ecu to diagnose further?
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05omegav6

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #43 on: 17 June 2015, 08:34:45 »
Underated vapouriser? Any idea what vapouriser is fitted... :-\
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steve6367

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Re: 2.5 Estate fluctuating idle and cutting out
« Reply #44 on: 17 June 2015, 08:37:30 »
Quote from: Harris K Telemacher on 17 June 2015, 08:34:45
Underated vapouriser? Any idea what vapouriser is fitted... :-\

Original Tartarini I believe - after the earlier comments when I purchased the car I did check and it is plumbed into the back of the block and seems to receive hot water as soon as the engine is warm. I will see if I can find a model make etc

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