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Author Topic: 3.2 Miss fire - MAF or LPG  (Read 4359 times)

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zirk

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3.2 Miss fire - MAF or LPG
« on: 29 July 2012, 11:20:34 »
Runs fine on Petrol and LPG, then typically on the Motorway when LPG cruising, if I put foot down or lift off, then straight away brings up EML with P100 (MAF), if I switch it back to petrol quickly enough I can normally 'nurse maid' back to normal and wait for the EML to stop flashing and fine again on petrol (now with a stored P100), if I leave on LPG it starts to miss on a couple of cylinders and if left long enough will start to grind to a halt with nearly always a full, P100,300,302,303,304,305,306, which by this time Im looking at doing a Ing' reset to get it back to normal on petrol.

Will run fine all day long on petrol with out any EML or hickups, so question is do I have a failing MAF or something else or is it an LPG issue?

Car is 3.2 Manual with Dream XX1 LPG.

Chris. 
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TheBoy

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Re: 3.2 Miss fire - MAF or LPG
« Reply #1 on: 29 July 2012, 11:21:57 »
If it runs fine on Petrol, but not on LPG..... ;)

Unless the spark plugs are getting tired. But all 6 together  :-\
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zirk

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Re: 3.2 Miss fire - MAF or LPG
« Reply #2 on: 29 July 2012, 11:23:23 »
Quote from: TheBoy on 29 July 2012, 11:21:57
If it runs fine on Petrol, but not on LPG..... ;)

Unless the spark plugs are getting tired. But all 6 together  :-\

Would spark Plugs bring up P100?
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TheBoy

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Re: 3.2 Miss fire - MAF or LPG
« Reply #3 on: 29 July 2012, 11:24:06 »
If its missing badly enough.
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feeutfo

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Re: 3.2 Miss fire - MAF or LPG
« Reply #4 on: 29 July 2012, 11:24:42 »
How old are the Plugs? If under 20k Gm plugs I'd be tempted to try another maf.
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noel

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Re: 3.2 Miss fire - MAF or LPG
« Reply #5 on: 29 July 2012, 11:26:02 »
have you tried disconnecting the maf sensor and running it  :-\
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oh well that's another day done

zirk

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Re: 3.2 Miss fire - MAF or LPG
« Reply #6 on: 29 July 2012, 11:29:11 »
forgot to mention if it does stall on LPG, ie Ive pull of a slip road and stopped at the roundabout, its a right pig to start again on petrol, needs lots of cranking, but I assuming thats down to un burnt gas still in the system, again if running on petrol only starts on the key. 
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TheBoy

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Re: 3.2 Miss fire - MAF or LPG
« Reply #7 on: 29 July 2012, 11:30:05 »
Quote from: zirk on 29 July 2012, 11:29:11
forgot to mention if it does stall on LPG, ie Ive pull of a slip road and stopped at the roundabout, its a right pig to start again on petrol, needs lots of cranking, but I assuming thats down to un burnt gas still in the system, again if running on petrol only starts on the key.
More likely due to trims being BF'd....
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feeutfo

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Re: 3.2 Miss fire - MAF or LPG
« Reply #8 on: 29 July 2012, 11:32:45 »
Plugs can throw the trims on gas. In my limited experience.
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zirk

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Re: 3.2 Miss fire - MAF or LPG
« Reply #9 on: 29 July 2012, 11:34:00 »
Quote from: TheBoy on 29 July 2012, 11:24:06
If its missing badly enough.

Ok,thanks TB, set of plugs to start with then.

Quote from: chrisgixer on 29 July 2012, 11:24:42
How old are the Plugs? If under 20k Gm plugs I'd be tempted to try another maf.

Will try plugs first Chris, although not that old, no spare Maf handy at the mo, unless their the same as a 3.0 guessing not.
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zirk

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Re: 3.2 Miss fire - MAF or LPG
« Reply #10 on: 29 July 2012, 11:36:57 »
Quote from: noel on 29 July 2012, 11:26:02
have you tried disconnecting the maf sensor and running it  :-\

No I haven't, did cross my mind though, but sort off guessing the LPG setup wouldn't like it with a dissed MAF.
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TheBoy

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Re: 3.2 Miss fire - MAF or LPG
« Reply #11 on: 29 July 2012, 11:40:08 »
3.2 maf is different to a 3.0, and is quite fragile.

Only way to test a failing MAF is with a proper code reader. The fact it *only* happens on LPG should give some clues...
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zirk

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Re: 3.2 Miss fire - MAF or LPG
« Reply #12 on: 29 July 2012, 11:45:02 »
Quote from: TheBoy on 29 July 2012, 11:40:08
3.2 maf is different to a 3.0, and is quite fragile.

Only way to test a failing MAF is with a proper code reader. The fact it *only* happens on LPG should give some clues...

Thanks.

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feeutfo

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Re: 3.2 Miss fire - MAF or LPG
« Reply #13 on: 29 July 2012, 11:46:53 »
Quote from: zirk on 29 July 2012, 11:34:00
Quote from: TheBoy on 29 July 2012, 11:24:06
If its missing badly enough.

Ok,thanks TB, set of plugs to start with then.

Quote from: chrisgixer on 29 July 2012, 11:24:42
How old are the Plugs? If under 20k Gm plugs I'd be tempted to try another maf.

Will try plugs first Chris, although not that old, no spare Maf handy at the mo, unless their the same as a 3.0 guessing not.
...only because maf is a two minute job if you have a spare. Plugs however...

I have a spare maf here if it's if use at any point.
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Kevin Wood

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Re: 3.2 Miss fire - MAF or LPG
« Reply #14 on: 29 July 2012, 12:29:11 »
Cut LPG out of the equation, I would say. Drive it only on petrol for a few days and see if it behaves to eliminate any MAF issues. <actually, you've confirmed OK on petrol, so MAF clearly OK>

I would say most likely the LPG setup is not mapped properly at that speed/load combination or the vapouriser isn't getting enough heat into it to supply the constant fuel demand required for motorway cruising, and the LPG pressure is dropping off. If you can shut it down and pull over safely as soon as this starts happening, it would be interesting to see if the vapouriser (or LPG tank) are getting very cold.

How and where is the vapouriser plumbed into the coolant system?

Plugs always worth checking, and changing if they've done 20k or more, but I wouldn't expect such a night and day difference between LPG and petrol.
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