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Recent LPG Starvation Issue
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Telpat16
Posted 19/9/2013 19:17 (#15737 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD

Back to basics --  2 more Lean idle CEL's today after new battery

At least instant morning starts now

Have clamped vapour purge line closed - now to see what tomorrow brings!



Edited by Telpat16 19/9/2013 19:18
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Telpat16
Posted 20/9/2013 20:02 (#15738 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD		Today brought more CEL's - lean idle still the fault

Do any members have history with the development of this ECU for the Aus 380?

What is logic that leads to a lean idle CEL??

Detailed log analysis shows pending DTCs sitting and disappearing but sometimes becoming permanent with "CEL ON" the result
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Administrator
Posted 20/9/2013 23:26 (#15739 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Location: An island off southern Tasmania.		Call Paul Nolan at Impco technologies in Braeside melbourne.


I wonder if your inline filter needs replacing Terry?
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Telpat16
Posted 21/9/2013 08:06 (#15740 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD

Tks.

 Filter replaced this time last year

Long term fuel trims about -14% so I think system set fairly rich

No sign of going back to petrol on hard acceleration



Edited by Telpat16 21/9/2013 08:53
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Administrator
Posted 21/9/2013 10:21 (#15741 - in reply to #15740)
Subject: Re: Recent LPG Starvation Issue



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Posts: 1092
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Location: An island off southern Tasmania.
Telpat16 - 21/9/2013 08:06

Tks.

 Filter replaced this time last year

Long term fuel trims about -14% so I think system set fairly rich

No sign of going back to petrol on hard acceleration




No sign of going back to petrol is an erroneous setting.

In the software you can set what rpm/injector duty cycle to switch back at.

I wonder if that is your problem?

The Impco ECU setup tool would reveal all mate.
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Telpat16
Posted 21/9/2013 11:35 (#15742 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD

I will find some hills to do some full load testing

Live in inner Sydney so opportunity for full throttle a bit limited!

Has been connected to ECU setup tool a few times at "NewGas", but I recall (going back to page 1 of this thread) that no problem going back to petrol automatically under load when I had a LPG valve problem causing starvation



Edited by Telpat16 21/9/2013 16:10
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Administrator
Posted 21/9/2013 13:28 (#15743 - in reply to #15742)
Subject: Re: Recent LPG Starvation Issue



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Posts: 1092
10005025555
Location: An island off southern Tasmania.
Telpat16 - 21/9/2013 11:35

I will find some hills to do some full load testing

Live in inner Sydney so opportunity for full throttle a bit limited!

Has been connected to ECU setup tool a few times at "the Gas Man", but I recall (going back to page 1 of this thread) that no problem going back to petrol automatically under load when I had a LPG valve problem causing starvation



shouldn't need hills....just floor it from takeoff and the LED on the LPG fuel gauge should turn from green to yellow to red and then back again.

about 3000-3500 rpm should do it.
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Telpat16
Posted 21/9/2013 16:02 (#15744 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Posts: 108
1005
Location: NEWPORT QLD		Will try later

Just did a motorway and heavy traffic loop of about 60 km on petrol - no sign of pending or permanent DTC's in the scan tool log - so I guess that narrows the problem to LPG
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Administrator
Posted 21/9/2013 16:09 (#15745 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



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Posts: 1092
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Location: An island off southern Tasmania.		It may be your changeover rpm is set too high..

The LPG system leans out and thats why we make it change to petrol.

just a thought?


When i was running supercharged LPG we had it set to 2500 rpm..as soon as boost came on the LPg system couldnt deliver....and....

remember...no fuel pump with LPG just tank pressure...so as the fuel level goes down lpg fuel line pressure goes down too.
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Telpat16
Posted 21/9/2013 17:29 (#15747 - in reply to #14894)
Subject: Re: Recent LPG Starvation Issue



Frequent flyer Gold

Posts: 108
1005
Location: NEWPORT QLD		Tried WOT launch - no problem goes to petrol about 3.5 to 4000 - silent change - so I guess I never had my head down before when my boot was that far in

No new DTC's on that run either - wish I knew how to generate on demand to narrow the issue!
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