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LPG backfires on start up sometimes 

 

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efweapon
 Post subject: LPG backfires on start up sometimes
Posted: Sat Apr 10, 2010 2:32 pm 
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Hi guys as the topic suggests the car doesnt like starting sometimes it back fires and blows a plug off that is near the injectors causing a vacuum leak. The car is an ef is there anything that can be done or does anyone know what the problem is. Its been doing it since i got put on gas so its a couple of years now
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89.SVO
 Post subject: Re: LPG backfires on start up sometimes
Posted: Sat Apr 10, 2010 2:37 pm 
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do you use the accelerator when starting?
if so. don't

 

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efweapon
 Post subject: Re: LPG backfires on start up sometimes
Posted: Sat Apr 10, 2010 3:06 pm 
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there is no accelaration i dont touch anything except the ignition i let it prime as well so it doesnt do it as often
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ToranaGuy
 Post subject: Re: LPG backfires on start up sometimes
Posted: Sat Apr 10, 2010 3:21 pm 
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There is a few things that will cause a LPG car to backfire. Ignition system is the first place I'd be checking out.

Cheers

ToranaGuy

 

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89.SVO
 Post subject: Re: LPG backfires on start up sometimes
Posted: Sat Apr 10, 2010 3:35 pm 
Getting Side Ways
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how old are the plugs, leads, cap and rotor button? no other small vacuum leaks?

 

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Daily driver: 2010 Toyota Crown hybrid 3.5L V6 hybrid. 254kw.
Weekend car: AU2 "XR8" 220kw 5L 5 speed. 19" BBS LM . Full exhaust. Lowered on Kings and Koni's. 13.8@97mph
Fast car: EA SVO AU motor. Built BTR. SDE 3500 stall. 76mm turbo. On E85. approx 425rwkw. 10.8@126mph
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efweapon
 Post subject: Re: LPG backfires on start up sometimes
Posted: Sun Apr 11, 2010 2:45 pm 
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everything has been changed and it still backfires.

How do i check the ignition system for faults???
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89.SVO
 Post subject: Re: LPG backfires on start up sometimes
Posted: Sun Apr 11, 2010 2:54 pm 
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well if you say everything has been changed, it should be fine. were proper gas temperature and electrode plugs installed? were they gapped correctly?

whats the timing set at?

 

_________________

Daily driver: 2010 Toyota Crown hybrid 3.5L V6 hybrid. 254kw.
Weekend car: AU2 "XR8" 220kw 5L 5 speed. 19" BBS LM . Full exhaust. Lowered on Kings and Koni's. 13.8@97mph
Fast car: EA SVO AU motor. Built BTR. SDE 3500 stall. 76mm turbo. On E85. approx 425rwkw. 10.8@126mph
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ToranaGuy
 Post subject: Re: LPG backfires on start up sometimes
Posted: Sun Apr 11, 2010 4:11 pm 
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VIC, Australia
I'd suggest a spark plug gap or 0.9 instead of the factory 1.0-1.1mm spec.

Cheers

ToranaGuy

 

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I am the ToranaGuy!|74 Lh Torana Turbo|78 Hz PanelVan|86 Mighty Boy Ute|93 EB2 Ghia,GT Mockup,5spd,LPGI,Full Leather|2 x EB Xr8 5spd's|FS [VIC]: Wrecking - Eb XR8 - Parts available |Build Thread|Ebay Items - Ford Parts|
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Mudguard32
 Post subject: Re: LPG backfires on start up sometimes
Posted: Tue May 11, 2010 11:06 pm 
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I have had similar problems with an EB, it also would back fire and stall, jsut what you want when you are making a right hand turn (grab nuetral and start the bugger back up). I took it to a number of places and none of them fixed it. I found a mechanic that knew what they were doing and made the converter vertical again and it never missed a beat since. Good gas guys are hard to find. keep Ford service engineers away from them.

Cheers Mudguard
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