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Author Topic: 2.2 petrol splutters when starting  (Read 3247 times)

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pigtown

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2.2 petrol splutters when starting
« on: 12 July 2010, 20:51:23 »
On starting in any weather and any time of day it splutters as if missing for a few minutes but when it settles it is fine. I can then stop and restart and no problem. I have changed plugs and rubber boots. cleaned the breathers but no better. It also has LPG and if I change to LPG when spluttering it runs ok.
So my suspicion is fuel related. 2.2 doesn't have an IACV so it's not that. Any ideas?
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alexandjen

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Re: 2.2 petrol splutters when starting
« Reply #1 on: 13 July 2010, 21:59:15 »
Did you clean the throttle body when you did the breathers?

http://www.omegaowners.com/forum/YaBB.pl?num=1162397695
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TheBoy

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Re: 2.2 petrol splutters when starting
« Reply #2 on: 13 July 2010, 22:27:09 »
if you use it on petrol for 20 or 30 miles, is it any better?

(wondering if lpg calibration is out, dragging in excessive fuel trim that buggers up petrol running)
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pigtown

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Re: 2.2 petrol splutters when starting
« Reply #3 on: 14 July 2010, 13:28:14 »
I did clean the throttle body and it was quite dirty!

Once I start going it seems to clear up whether on petrol or LPG, although LPG seems to run better than petrol so maybe it is something to do with the set up.
It is only a mixer LPG.

Once it's cleared I can stop and start up again with no problems - which makes it difficult to fault find!

When I changed the plugs I noticed the front one was a different coulour to the rest and that is why I changed the boots in case it was arcing.
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pigtown

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Re: 2.2 petrol splutters when starting
« Reply #4 on: 15 July 2010, 19:24:32 »
Is the MAF used when running LPG?
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alexandjen

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Re: 2.2 petrol splutters when starting
« Reply #5 on: 15 July 2010, 19:29:49 »
Quote
Is the MAF used when running LPG?

Yes it is used continuously as the air intake is flowing through it, you could try cleaning it or unplug it and see if there's any difference
« Last Edit: 15 July 2010, 19:30:26 by alexandjen »
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mark.adams

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Re: 2.2 petrol splutters when starting
« Reply #6 on: 15 July 2010, 20:32:00 »
Mine does this too (when it works) same type of LPG too...
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pigtown

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Re: 2.2 petrol splutters when starting
« Reply #7 on: 17 July 2010, 11:42:22 »
Mark - Same model of Omega as well I see.
Is there an inherent problem with the 2.2 petrol?
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tunnie

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Re: 2.2 petrol splutters when starting
« Reply #8 on: 17 July 2010, 11:46:37 »
No, mine is sweet on gas or petrol, Done 10k on gas in last few months
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pigtown

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Re: 2.2 petrol splutters when starting
« Reply #9 on: 18 July 2010, 11:17:50 »
Mine used to work ok on petrol. This problem has been going on for only a couple of months now.
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mark.adams

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Re: 2.2 petrol splutters when starting
« Reply #10 on: 18 July 2010, 18:52:05 »
I replaced the MAF with a measure of success...
Still not perfect, head off for skimming at the moment, i'll let you know how it performs when its back together in about a week or so.
I think the 2.2 has a lot of inherent problems sadly.
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pigtown

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Re: 2.2 petrol splutters when starting
« Reply #11 on: 19 July 2010, 18:53:13 »
I had the head replaced a while back - it had split so not just a gasket.
Strange how mine runs better on LPG than petrol as I thought LPG picks out any faults.
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mark.adams

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Re: 2.2 petrol splutters when starting
« Reply #12 on: 19 July 2010, 20:07:05 »
Same here, my lpg is a mixer system and therefore doesn't use the vauxhall ECU, i think it must hook into the MAF and Exhaust sensors
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tunnie

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Re: 2.2 petrol splutters when starting
« Reply #13 on: 19 July 2010, 20:12:49 »
are you loosing any coolant?
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pigtown

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Re: 2.2 petrol splutters when starting
« Reply #14 on: 20 July 2010, 19:02:10 »
I do lose a small amount of coolant.
I need to top up about every month (1500 miles).
How is this linked to petrol but not LPG?
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