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PostPosted: Tue Feb 15, 2011 5:15 pm 
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Hi all. I am having problems with my Astra 02 plate 1.6 16v dual fuel It will swithch over to gas after about half a mile but will then go back to petrol after about 2 miles and will not go on gas again until it is stone cold again.


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PostPosted: Tue Feb 15, 2011 11:30 pm 
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Make sure your coolant level is up to the maximum mark.

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PostPosted: Wed Feb 16, 2011 12:51 pm 
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Yeah done this, but I am wondering if it may be the temp sensor at fault?


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PostPosted: Wed Feb 16, 2011 12:54 pm 
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Funny thing is the light in the switch stays on even when the ign is off.


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PostPosted: Wed Feb 16, 2011 9:09 pm 
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Light on overnight, or just for a minute or two?

I think it would be worth identifying the type of gas system fitted, it may not be a "factory" job. See 'pjpj' gallery here
http://homepage.ntlworld.com/paul.joyce53/bin/LPG/Vauxhall%20Koltec%20Necam%20System.html

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PostPosted: Wed Feb 16, 2011 11:18 pm 
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I made a mistake, the light is not on it was a reflection :oops: Anyway it is an EGI type, and I have tested the temp sensor this seemed to be ok, I put power to the solenoid on the gas tank and both solenoids activated front and back but it did not go on to gas. I had another temp sensor from another car and wired it to my car and put it in boiling water it was reading around 400 on my multimeter I started the car but it still would not change over. I wiggled everything I could see and it still would not change. What critera does it need to run? the light is flashing constantly like as if it is waiting for something to let it work. I will see if it changes in the morning when it is cold now after my tinkering, or if I have now lost this too :( Thanks to all for your replies to a newbie. I have a 3.0 24v Carlton on the suck through type and I know it inside out. Wish the Astra was as easy. Cheers Rae.


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PostPosted: Wed Feb 16, 2011 11:39 pm 
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Sorry after looking at the guide it seems the EGI nd The Gsi are very alike. I will identify what I have in the morning.


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PostPosted: Thu Feb 17, 2011 8:43 pm 
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Is the car not running on LPG at all now?

The EGI has passive injectors and the throughput of gas is controlled by the stepper motor on the distributor,

The GSI has electronic injectors and a simple 1-4 way splitter.

Once you have confirmed the LPG model, I will forward you an appropriate diagnostic sheet.

If the system is not switching over to gas at all, it could be the 58x module or, seeing as you have tested the temperature sensor, the wiring from the temperature sensor.

The 58x module costs apx. £80.00 +VAT from Vauxhall with about a weeks waiting time.

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To help identify your Vauxhall LPG model, go HERE


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PostPosted: Thu Feb 17, 2011 11:13 pm 
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Thanks for that :) gives me hope :) It is the Gsi I have, as I have electronic injectors. At the moment it seems to have a mind of it's own and it will switch over and go great and then after a minute it will loose all power but the gas light is still on for about five seconds I keep my foot down then it switches over to petrol again and it pulls away again :?: Cheers Rae.


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PostPosted: Thu Feb 17, 2011 11:23 pm 
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It sounds like you have a restriction in the gas supply.

A blocked filter or solenoid valve not opening fully.

Spares

PM sent

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To help identify your Vauxhall LPG model, go HERE


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PostPosted: Fri Feb 18, 2011 10:25 am 
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Do you know where the filters are located please? Rae


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PostPosted: Fri Feb 18, 2011 5:01 pm 
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Oh well it refuses to run on gas at all now, and the solenoids are not switching, so I assume it cannot be a blockage as the pressure cannot be known until the solenoid opens and supplies the reducer with gas.


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PostPosted: Fri Feb 18, 2011 5:26 pm 
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Have you read the fault log on the LPG ECU?

If that is only telling you code 12, it may well be the 58x module.

Part No. 93182211. It's called the Amplifier Case Signal by Vauxhall. Possibly CCF002. (I believe)


P.S. There is no pressure sensor.

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Last edited by pjpj on Fri Feb 18, 2011 5:40 pm, edited 1 time in total.

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PostPosted: Fri Feb 18, 2011 5:27 pm 
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I'm guessing you still have some gas left in the tank?

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PostPosted: Fri Feb 18, 2011 6:56 pm 
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Yes plenty of gas in the tank, and PJ you are correct I done the code thing this morning, and all I got was repeated 12s


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PostPosted: Fri Feb 18, 2011 8:57 pm 
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Seeing as it will not run on gas at all since you have played around with the temperature sensor, have you checked the connector and wiring for corrosion and damage?

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PostPosted: Sat Feb 19, 2011 10:22 am 
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pjpj wrote:
Seeing as it will not run on gas at all since you have played around with the temperature sensor, have you checked the connector and wiring for corrosion and damage?


Yes they seem ok, and after I checked the temp sensor it did switch over a couple of times also the light does not change from the 0.5 on 0.5 off now. It just keeps flashing at the same speed. Is there anyway I can test the CAS before going to the expense of buying a new one? Cheers Rae.


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PostPosted: Sat Feb 19, 2011 11:14 am 
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Only by plugging it into a working system I think.

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PostPosted: Sat Feb 19, 2011 4:30 pm 
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So if the 58x is broken it will not attempt to switch to gas? (Sorry for being a pain).


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PostPosted: Sat Feb 19, 2011 7:17 pm 
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They can fail in different ways.

Most times it will not switch to gas at all. It won't even attempt.

Most times no fault code is stored.

Sometimes it is intermittent.

Sometimes it can effect petrol running as well. (Just unplug it and you can run on petrol)

Sometimes a fault code is stored.

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To help identify your Vauxhall LPG model, go HERE


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