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 Post subject: Zavoli Alisei N issues
PostPosted: Sun Jan 09, 2011 5:50 pm 
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Joined: Sat Jan 08, 2011 8:55 pm
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Hi, first post and new to LPG so go easy on me

I've recently bought a 1999 Audi A4 1.6 with a Zavoli Alisei N system that was 'professionally' installed back in 2004, I've been having a few problems with it though.

Firstly when changing over to gas in the early hours it can sometimes missfire for a few seconds, it then clears and runs fine. If I buy a programming lead and software could I alter the changeover temperature to eliminate this ?

Secondly I found that the catalytic converter has been removed, probably due to the lambda sensor being shot. I have replaced the lambda sensor for a genuine Audi item, it does run a little sweeter but I am now getting 2 errors on the VAG diagnostic tool, Lambda sensor shorted to positive and Lamda sesnor lower stop limit.

I've had a look at the wiring and I think my 3 year old daughter could've done a neater job, bare wires twisted together and held with tape, 6 miles of loom when 2 feet would've sufficed etc etc. Is there a wiring schematic for this unit available to download ?

The Zavoli.com website seems to be down at the minute and the Zavoli.co.uk seems to be as much use as a chocolate fireguard.

Finally, should i really have 2 lambda sensors ? one for petrol and a seperate for gas or is it ok to splice the signal from 1 sensor to both ECU's as it's set up now ?

Thanks in advance,

Iain T


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PostPosted: Sun Jan 09, 2011 7:53 pm 
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templ8 wrote:
Firstly when changing over to gas in the early hours it can sometimes missfire for a few seconds, it then clears and runs fine. If I buy a programming lead and software could I alter the changeover temperature to eliminate this ?
Yes.
templ8 wrote:
Secondly I found that the catalytic converter has been removed, probably due to the lambda sensor being shot. I have replaced the lambda sensor for a genuine Audi item, it does run a little sweeter but I am now getting 2 errors on the VAG diagnostic tool, Lambda sensor shorted to positive and Lamda sesnor lower stop limit.
You don't need the cat if the car is run on gas. If you take it for an MoT running on petrol without the cat, it will probably fail but if it is presented for test running on gas, it should pass no problem. The errors may be due to the way the connection to the lambda has been made. There are two ways of making the connection, you either T into the signal wire or you cut it and intercept it. The gas ECU then sends a simulated lambda signal to the petrol ECU. This can often cause lambda errors to be thrown up by the petrol ECU. Simply Teeing into the lambda signal wire should cure this.
templ8 wrote:
I've had a look at the wiring and I think my 3 year old daughter could've done a neater job, bare wires twisted together and held with tape, 6 miles of loom when 2 feet would've sufficed etc etc. Is there a wiring schematic for this unit available to download ?
The Zavoli uses an AEB ECU as does the OMVL Dream, this link http://www.vogelsautogas.nl/documenten/ ... eiding.pdf is for the OMVL version in Dutch, the Zavoli manual (without a wiring diagram) is here http://www.zavoli.com/upload/manuali/en_file_7.pdf or if you look at the third post in this thread on page 4 viewtopic.php?f=33&t=8148&start=45 you'll find the OMVL diagram but annotated in English.
templ8 wrote:
Finally, should i really have 2 lambda sensors ? one for petrol and a seperate for gas or is it ok to splice the signal from 1 sensor to both ECU's as it's set up now ?
As your lambda sensor is a standard 4 wire Zirconia sensor a second one isn't necessary. What you have will work perfectly with the gas system.

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'93 Range Rover 4.2 LSE, Lovato LovEco, sold
'98 Ex-Police Range Rover 4.0, Singlepoint AEB Leo, my daily motor
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PostPosted: Sun Jan 09, 2011 10:51 pm 
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Joined: Sat Jan 08, 2011 8:55 pm
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Thankyou very much for your reply, extremely helpful.

Cheers,

Iain T


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