Question about Ford Fairmont

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Will not run on lpg after a backfire type noise on start up

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  • dale townsend Sep 04, 2010

    thanks for info but that was the first thing i tested. cheers

  • dale townsend Sep 04, 2010

    the car will start on lpg but runs like a horse with 4 broken legs,

  • dale townsend Sep 04, 2010

    plugs are fine, it seems like it is either starving or getting to much lpg

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Hi! The fuel switch could be faulty causing the car not to start. You may want to have the fuel switch checked first as a first course of action. Hope this helps and thank you for using FixYa!

Posted on Sep 04, 2010

  • dj_relly999
    dj_relly999 Sep 04, 2010

    Alrighty, have you checked the plugs?

  • dj_relly999
    dj_relly999 Sep 04, 2010

    A faulty regulator can cause this too.

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alicantecoli
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SOURCE: started car running on petrol for 5 minutes with

could be number of problems but often this is caused by valve on the inlet manifold which is electricaly operated and then it allows the gas in but it is also vacumn sensitive so a perished rubber pipe could cause it not to sense the vacumn .best advice without seeing it is to visit a mechanic that is conversant with LPG conversion

Posted on Apr 12, 2010

Testimonial: "Have already booked in with an LPG mechanic. Just wanted a bit of heads up so I knew what it might be. Many thanks for prompt response"

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1 Answer

My Falcon has just started backfiring while on LPG whenever I accelerate. However, when I switched it back to petrol it runs fine. Whats the deal?


have an automotive gas expert check the converter for the gas
There is a problem in the gas supply from that unit

Jan 22, 2016 | 2005 Ford Falcon

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I have a BF MKII SERIES Ford Falcon Sedan which has a Factory fitted LPG motor. It backfires when I start the vehicle. Please let me know if it can be fixed.?


A lean mixture is causing this fault, It is important to have this repaired. if lean only on start not a big fault. if lean on running under load it will burn exhaust valves and top of pistons.

Dec 12, 2015 | Ford Cars & Trucks

1 Answer

I have a dual tank of petrol and LPG. I had the conversion done for about 5 to 10 years. Since last year I have this problem of backfiring. The last one the air filter cover cracked, the brackets are gone....


the gas converter has probably corroded inside and is not working like it should
They do not last forever so I would suggest that you take the vehicle to an accredited gas shop and have the gas section checked out.

Mar 16, 2015 | Cars & Trucks

1 Answer

Hi the other day i started the toyota up after finishing work it backfired now it wont run on lpg. It runs on petrol but wont on LPG any ideas would be great.


the fact that it runs on fuel means that the electronics of the vehicle are all operational. The problem is the fuel selection process for he LPG. The converter for the lpg is prone to corrosion and failures internally so I would suggest that you have an accredited Auito gas specialist look at the gas system

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1 Answer

Ignition timing mitsubishi triton 2003 3.0L GLX


Depending if it is backfiring out carb or out exhaust will tell you if the time is off. The carb backfire is a sure sign the timing is off. A valve is not completely sealed off before ignition and it explodes before sealing off the chamber. This also could mean a burnt valve as well.
AN exhaust pipe backfire could be a few things. Raw fuel in muffler that ignites from the heat. Over rich mixture, timing, jump timing belt, clogged catalyst, etc.
Now your vehicle runs on LPG which actually is a good thing. Much cheaper then gasoline fuel. I am not familiar with LPG carburation methods, but backfires are pretty basic. Carb or exhaust fire, timing is a good direction and carb adjustment. I would do a compression test also. Check for a leak that is not allowing a full burn of the fuel in the chamber. Check vacuum lines also.
If Timing the vehicle requires a short between 2 points, it must be done to show correctly the proper setting without advancing the timing. As long as the distributor has not been removed and placed a tooth off which is rare, but jumped timing belts will set a tooth off occasionally. Do a compression test, it will let you know your engines condition accurately.

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1 Answer

LPG Converted Rodeo Backfires


Backfiring in this case is caused by a lean air/fuel mixture, so I would suggest you richen up the gas supply by either increasing the pressure or the volume of gas being delivered to the engine.

Feb 07, 2012 | Cars & Trucks

2 Answers

Started car running on petrol for 5 minutes with lpg switched on, clicking noise from lpg tank, slight smell of gas, when fuel switched to lpg engine cut out. start again on petrol, switch on lpg again,...


could be number of problems but often this is caused by valve on the inlet manifold which is electricaly operated and then it allows the gas in but it is also vacumn sensitive so a perished rubber pipe could cause it not to sense the vacumn .best advice without seeing it is to visit a mechanic that is conversant with LPG conversion

Apr 12, 2010 | 1997 Ford Explorer AWD

1 Answer

Im wanting to convert my 2002 V6 2.0 X type to lpg,but have been given lots of different stories regarding Valve seat recession.Anybody help?


You have been given false information, in old cars that were not designed to run on unleaded fuel then yes, but your car was designed to run specifically on unleaded fuel and will run just fine and even more emmisions free on LPG gas, the only draw back to LPG is the size and location of the fuel tank required to use LPG as your exclusive source of fuel. being that it is a car you will looses storage space in your trunk area and the oter draw back depending on where you live is availability of filling staations... but absolutely no internal engine concerns.

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2 Answers

Why did my airfilter box explode? A Landrover Disco.


Hi,
If an inlet valve stuck or has a crack - it may ignite the rest of the gas/air mix - causng a backfire into the airbox.

This may be temporary or a permanent- recurring problem. Only by taking the head off can you check valve conditions and that all springs and guides are good.

This is the most likely cause - pre-ignition from a slow to close valve.

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1 Answer

LPG not working?


You will have to recheck that all the wires were reinstaled.The noise is the fuel pump.The lpg system has its own fuses so you will have to check them also.The only thing you touched was the battery so the problem is there somewhere..Earth wire is also important just double check all the things you undid.Let me know how you go

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