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LPG Issues 

 

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 Post subject: LPG Issues
Posted: Thu Mar 09, 2006 9:08 pm 
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hey guys, was hoping someone could help out with a recent prob in my gas sys. Just lately my car has the annoying habit of backfiring on gas SOMETIMES when i put my foot down. Any ideas?? Could it be that the selonid in the converter is playing up so an incorrect mix ratio??? :shock:
Any help please.... :cry:
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Posted: Thu Mar 09, 2006 9:25 pm 
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i found mine starts back firing whern there's an ignition issues - i.e. damaged or unconnected ignition lead or old spark plugs...

 

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Posted: Thu Mar 09, 2006 10:05 pm 
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i hope when ur starting the car u dont put the foot down to hard to the point of doing wat stupid sales people did at work a week ago, for about ten mins they were trying to start this aftermarket gas system that was fitted onto a jeep and as soon as the guys went away for a bit, different guy starts the car starts reving it for a bit then bang the air box blew, and the jeep was pretty much a delivery for that day i think.
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Posted: Thu Mar 09, 2006 10:48 pm 
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get your LPG mixes checked the system might be leaning out
if the LPG mixes cant be adjusted then full Tune Up

 

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Posted: Thu Mar 09, 2006 10:57 pm 
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my dads old EL on LPG did that, dunno why though

 

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 Post subject: Re: LPG Issues
Posted: Fri Mar 10, 2006 8:32 am 
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ex-cabi wrote:
hey guys, was hoping someone could help out with a recent prob in my gas sys. Just lately my car has the annoying habit of backfiring on gas SOMETIMES when i put my foot down. Any ideas?? Could it be that the selonid in the converter is playing up so an incorrect mix ratio??? :shock:
Any help please.... :cry:
Lean mixures are the source of backfires if ignition leeds and plugs can be ruled out. I assume that you still have not replaced the stepper motor. If so your workaround you replaced it with could be adjusted too lean.

 

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Posted: Sat Mar 11, 2006 10:29 pm 
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nah not the plugs or leads as i just changed em last service...infact the prob only started once i did change em
the old plugs looked rooted, they had a white/grey carbon residue on them and were worn----not sure of the source.
thought the prob was that the engine running rich as im not get'n as many kms as i use too but my mates recon it s the age of hte car :evil:
Any ideas how i can pinpoint the source?
cheers guys
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Posted: Mon Mar 13, 2006 7:27 pm 
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i think u answered your own question

"infact the prob only started once i did change em "

did u gap plugs to lpg spec

just cause they are new plugs / leads dont mean they are OK thats why u get a warranty check em anyway
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Posted: Wed Apr 05, 2006 7:35 pm 
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hey does anyone know the gap for LPG, i've been told its about 1.1mm just wanted to check...i think those dodgy bastard sold me the wrong plugs and charged me for em.
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Posted: Wed Apr 05, 2006 7:53 pm 
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Use NGK ZGR6B-11's and regap them to 0.9mm.

thats for e series 4.0l anyway 8-)
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