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Author Topic: Update on Stag LPG woes  (Read 4724 times)

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JamesV6CDX

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Re: Update on Stag LPG woes
« Reply #15 on: 27 October 2012, 15:17:41 »

Possible I suppose :-\

Just a thought, as I know he has had this issue in the past, are all the injector plugs sitting home correctly? He had one that seemed to be OK but would just unplug a little periodically, normally when the engine was very hot and he was "making progress" ::) At least, that's the phrase he used to tell me ::)

Yep, all fully home, and no amount of wiggling etc can break the connection... :/
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05omegav6

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Re: Update on Stag LPG woes
« Reply #16 on: 27 October 2012, 16:04:09 »

Thinking through this, (it's ok, I am sitting down and there's a nurse on hand).

Is it possible that one of the pot 2 valves is sticking slightly open, affecting the gas pressure at the nozzle :-\ any carbon build up in the plenum/inlet tract :-\
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JamesV6CDX

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Re: Update on Stag LPG woes
« Reply #17 on: 27 October 2012, 16:59:05 »


Is it possible that one of the pot 2 valves is sticking slightly open, affecting the gas pressure at the nozzle :-\ any carbon build up in the plenum/inlet tract :-\

Nope, because I switched the wiring and LPG feed to a different cylinder for elimination purposes.



Thinking through this, (it's ok, I am sitting down and there's a nurse on hand).


;D ;D
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05omegav6

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Re: Update on Stag LPG woes
« Reply #18 on: 27 October 2012, 18:05:04 »

Engine valves not injectors :-\ pressumed pot2/lpg injector4...
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JamesV6CDX

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Re: Update on Stag LPG woes
« Reply #19 on: 27 October 2012, 19:02:29 »

Engine valves not injectors :-\ pressumed pot2/lpg injector4...

Yeah I get that, but I've moved the troublesome injector circuit to a different cylinder (and hence different set of valves) on the engine... so that would eliminate that... :y
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05omegav6

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Re: Update on Stag LPG woes
« Reply #20 on: 27 October 2012, 19:13:03 »

If the nozzles are fitted as per the guide, any blockage of any given nozzle would only affect that nozzle, moving the injector would prove only that the injector is not the problem :-\
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JamesV6CDX

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Re: Update on Stag LPG woes
« Reply #21 on: 27 October 2012, 23:32:07 »

If the nozzles are fitted as per the guide, any blockage of any given nozzle would only affect that nozzle, moving the injector would prove only that the injector is not the problem :-\

5 o   o 6
3 o   o 4
1 o   o 2

With the above being the numbers of the actual cylinders on the engine, the corresponding LPG injector circuits (on the LPG loom) were originally configured as follows, in relation to the above:

5 o   o 4
3 o   o 2
1 o   o 6

(remember it doesn't matter which goes where, as long as the vapour hoses correspond with the same cylinder that the wiring is set up for)

So looking at the above picture, the circuit for number 4, top right, was erroring.

In order to eliminate the injector from the equation, I swapped the wiring, and vapour hoses, between (LPG) injectors number 4 and 6, so it is now configured as follows

5 o   o 6
3 o   o 2
1 o   o 4

So as you can see, the number 4 circuit now controls the front nearside injector, which due to the swap is now a different injector, different vapour pipe, different nozzle, and different physical cylinder altogether.

This is how a fault with the injector, any specific cylinder on the engine, valves, blockage etc, can be ruled out.

Get where I'm coming from?

:y

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05omegav6

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Re: Update on Stag LPG woes
« Reply #22 on: 28 October 2012, 00:05:18 »

Ok that now makes sense :y

Were the injectors new or s/h :-\
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JamesV6CDX

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Re: Update on Stag LPG woes
« Reply #23 on: 28 October 2012, 00:08:14 »

Ok that now makes sense :y

Were the injectors new or s/h :-\

Brand new mate... They've done less than 3k I reckon..
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05omegav6

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Re: Update on Stag LPG woes
« Reply #24 on: 28 October 2012, 00:15:46 »

Doesn't leave much else then :-\
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JamesV6CDX

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Re: Update on Stag LPG woes
« Reply #25 on: 28 October 2012, 00:19:26 »

Doesn't leave much else then :-\

The LPG loom all seems actually fine... I'm honestly wondering if something is up in the ECU.

And, TBH, taking that to bits is a bit more than I want to do... :(
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05omegav6

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Re: Update on Stag LPG woes
« Reply #26 on: 28 October 2012, 00:28:07 »

Are the ecus available as stand alone items :-\
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