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Ideas as to what may be causing overfueling on LPG

 
 
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seriesdriver
Off-Road Guru


Joined: 07 Aug 2004
Odometer: 1041
Location: West Yorkshire



PostPosted: Mon Mar 06, 2017 9:23 pm    Post subject: Ideas as to what may be causing overfueling on LPG Reply with quote

System is Bigas sequential on P38A 4.00ltr '97 Gems petrol.

Replaced diaphragms and filters 18 months ago and had system re-mapped at that point.

Driven a miserly 3500 miles since then.

Replaced both lambda last year when I replaced the cats.

Petrol side runs perfectly as it should.

Spark plugs replaced last year.

Software doesn’t show injector activity, never has, system I installed now 8 years old.
I did a firmware update 18 month ago.

I would welcome any suggestions as to possible cause / solution,
Thanks in advance.

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Regards
George
Res, non verba
P38A 4.0 SE on gas
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seriesdriver
Off-Road Guru


Joined: 07 Aug 2004
Odometer: 1041
Location: West Yorkshire



PostPosted: Sun Mar 12, 2017 8:17 pm    Post subject: Reply with quote

update:-
Stripped the injectors, visual inspection no excessive ware points on rubbers at each end, all springs measured same length and all coils same resistance.
System shows only 1640 hrs run time in the 8 years the system has been installed so the suggestion from Tinley Tec that the injectors " will be shot by now " doesn't bear out.
A chat with Mike at GAS Huddersfield pointed to my checking the HT and plugs.
He was right, the year old Britpart plugs were thrown out and NGK plugs gaped at 0.7mm installed.
Now no smell of un-burnt LPG from the exhaust and a full rev-range without any hesitation.
So not over fueling but it was poor spark giving inefficient burn.

I just hope I caught it in time and haven't destroyed the cats.

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George
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** GED **
Off-Road Guru


Joined: 18 Jun 2014
Odometer: 1728
Location: Scouser



PostPosted: Sun Mar 12, 2017 9:52 pm    Post subject: Reply with quote

its pretty hard to destroy a cat.




buggers keep landing on all fours

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absquatulation
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Joined: 17 Apr 2005
Odometer: 1897
Location: Lost



PostPosted: Mon Mar 13, 2017 9:17 am    Post subject: Reply with quote

Not if you put some buttered toast on their backs.
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** GED **
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Joined: 18 Jun 2014
Odometer: 1728
Location: Scouser



PostPosted: Mon Mar 13, 2017 1:09 pm    Post subject: Reply with quote

but then they stop just above the floor and stay there spinning.


bloody place is littered with spinning cats.


and before you suggest free energy, you try sticking the wires up its ass.

three hours in A&E last time i tried.

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jojo
Mud Obsessed


Joined: 11 Aug 2007
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PostPosted: Tue Mar 14, 2017 9:49 am    Post subject: Reply with quote

Did you try greasing the wires first?

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** GED **
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PostPosted: Tue Mar 14, 2017 10:08 am    Post subject: Reply with quote

i used the butter from the toast.

maybe the melting point wasnt high enough

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cynic-al
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Joined: 14 Nov 2006
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Location: scunthorpe


1989 Suzuki SJ

PostPosted: Tue Mar 14, 2017 3:02 pm    Post subject: Reply with quote

The only plugs that seemed to last on my V8 were BPR6ES, I tried others but didn't have any luck, some even cracked the ceramic. Glad your sorted!
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** GED **
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Joined: 18 Jun 2014
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Location: Scouser



PostPosted: Tue Mar 14, 2017 5:25 pm    Post subject: Reply with quote

how the hell did you get the plugs in?

i got a severe mauling just for the wires!

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the other co-founder of the DCJC

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cynic-al
Mud Obsessed


Joined: 14 Nov 2006
Odometer: 5962
Location: scunthorpe


1989 Suzuki SJ

PostPosted: Tue Mar 14, 2017 9:40 pm    Post subject: Reply with quote

I find turning the engine off first makes it a less shocking experience.
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seriesdriver
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Joined: 07 Aug 2004
Odometer: 1041
Location: West Yorkshire



PostPosted: Tue Mar 14, 2017 10:05 pm    Post subject: Reply with quote

Well now, I put a post on here in desperation hoping to get some sensible advice.

This used to be a great forum.

I get no advice nor suggestions as to a possible cause/solution to the LPG problem, then having sorted it and posting the results thinking they may help someone with similar LPG issues and what do I get ?

The butt for your jokes.

Thanks.

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George
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** GED **
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PostPosted: Wed Mar 15, 2017 9:03 am    Post subject: Reply with quote

to be fair, i think the cats butt was the butt of our jokes.



and i do apologise for having no knowledge of autogas systems, i`ll go read up now.













as soon as i can get that cat back in the box.

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Jim1064
Just got MTs


Joined: 22 Feb 2009
Odometer: 261
Location: Now living in Kent



PostPosted: Sat Mar 18, 2017 11:51 am    Post subject: Reply with quote

In my days of running a petrol car on LPG (Prins system) I found that when running on LPG the ignition is much more sensitive than on petrol. I replaced plugs and leads twice as often as recommended, and spray the leads regularly with water repellant.
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