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BA dedicated lpg car starts but will not run 

 

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 Post subject: BA dedicated lpg car starts but will not run
Posted: Sat Oct 01, 2016 2:07 pm 
Fordmods Newbie
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Age: 66

Posts: 3

Joined: 1st Oct 2016

Ride: ba ford dedicated lpg

Location: kinglake
VIC, Australia

I have a ba dedicated gas car with a vialle system the car was not starting so i
1 replaced the converter
2 cleaned the ring on the inlet manifold as it was dirty
3 replaced the stepper motor
after this the car started but would not run beyond 15 seconds when i turned the car off for about 1 min it started again only to do the same problem

I would appear that the fuel is not getting through from the tank or is it the o2 sensor or do i have to reset the stepper motor

If the stepper motor needs resetting can anyone tell me a simple way to reset it or is there a safety timer cut off in the system and if so where is it located and finally could the computer have an intermittent fault

Lpg seems to be a great headache

Can anyone who has had this problem help in solving this problem
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 Post subject: Re: BA dedicated lpg car starts but will not run
Posted: Mon Oct 03, 2016 8:17 pm 
Parts Gopher
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Age: 63

Posts: 85

Joined: 4th Feb 2016

Location: australia
VIC, Australia

Have you fixed your problem, or do you still need help.
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 Post subject: Re: BA dedicated lpg car starts but will not run
Posted: Tue Oct 04, 2016 6:52 pm 
Fordmods Newbie
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Age: 66

Posts: 3

Joined: 1st Oct 2016

Ride: ba ford dedicated lpg

Location: kinglake
VIC, Australia

Thanks for your question but i still cannot find the problem it starts for about 15 seconds then stops but wait a while then it runs again any idea if it is the computer issue or do i have to have the stepper motor calibtated .
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 Post subject: Re: BA dedicated lpg car starts but will not run
Posted: Tue Oct 04, 2016 9:27 pm 
Technical Contributor
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Age: 52

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Joined: 14th Jan 2005

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Ride: 96 XH/97 EL

Location: South Coast
NSW, Australia

Similar, not the same though.
auto-electrical-forum-f89/egas-ba-wont-crank-t131211.html

 

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96 XH Longreach 'S': LPG, Alarm, 3.23:1 LSD, Cruise, Trip Comp, ABS, Power Windows, Mid Series Dome Lt, Climate Ctrl
97 EL Futura S/W: LPG, Alarm, LED int Lts, Trip Comp, F/Lane Dome Lt, Climate Ctrl, T5 Conversion

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 Post subject: Re: BA dedicated lpg car starts but will not run
Posted: Tue Oct 04, 2016 9:55 pm 
Parts Gopher
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Age: 63

Posts: 85

Joined: 4th Feb 2016

Location: australia
VIC, Australia

Was the car playing up on the highway and around the streets,
or did you park it one night and it would not start the next day.
Did you fit a second hand convertor on the car or a reco or new
one, and did it come with the lock off solenoids and primer, or did
you fit your old ones, and what tests have you done to solve your
problem. I assume you have turned the valve on the tank back on.
What made you go for the convertor and stepper motor, also when
you cracked the liquid line did much liquid gas boil off.
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 Post subject: Re: BA dedicated lpg car starts but will not run
Posted: Wed Oct 05, 2016 2:43 pm 
Getting Side Ways
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Age: 44

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Joined: 23rd Dec 2007

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Ride: BA XR6T (mix of BA, BF and FG)

Location: Perth
WA, Australia

When diagnosing a problem like this I start with the electrical side and go from there.

Get a multimeter and check for power at the solenoid cut off switches.. one at the tank and one before the converter. make sure both are powered and switching when the ignition is on.

The O2 sensor failure will make it run badly, but shouldn't stop it as it will just swap to rich preset maps.

last time I fixed an issue like this it was actually a bad connection on the terminal of the cut off near the converter.. since falcons tend to have them above the exhaust heat kills the tension on the terminals and they become either huge voltage drops or outright open circuits. check the little stuff first.. much cheaper than just replacing things at random.
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 Post subject: Re: BA dedicated lpg car starts but will not run
Posted: Wed Oct 05, 2016 9:28 pm 
Parts Gopher
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Age: 63

Posts: 85

Joined: 4th Feb 2016

Location: australia
VIC, Australia

You were nearly right, the lpg relay, the tank lock off's or tanks if a ute, the idle solenoid as well as the convertor lock off, will not receive battery positive until the engine is cranking and the pcm receives a crank signal.

The prime solenoid has battery positive on it when the key is on, and the pcm will ground the solenoid when the engine cranks after it receives a crank signal, and the length of time depends on engine temp and time.

In a normal situation when the engine is cranking the pcm will pulse the stepper motor in to it's maximum position, then pulse it out to around 170 steps which is around the default position for open loop. While the engine is idling the 02 sensor will start cycling between .1 and .9 of a volt and the stepper motor will pulse in and out to keep the air fuel ratio at stoichiometric in closed loop.
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 Post subject: Re: BA dedicated lpg car starts but will not run
Posted: Thu Oct 06, 2016 10:28 am 
Fordmods Newbie
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Age: 66

Posts: 3

Joined: 1st Oct 2016

Ride: ba ford dedicated lpg

Location: kinglake
VIC, Australia

Thanks I will ask a mate can i use his hoist and check the power to the lockoffs and especially the one at the tank Thanks it is not the o2 sensor it must be a wire issue or power to the solenoids
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