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[Broomies Mate]

The 9-5 (thats a ScAAB to you) is LPG converted.  It runs sweet on either Petrol or Gas.......... but;

On WOT through 3rd, the LPG decides to throw a fit and start beeping at me. At the same time, I get the EML light.  Switch back to Petrol, and all is well in the world.

Drive it on LPG all day long without giving it a massive quantity of beans, and no troubles.

Stag300 kit.

Am I right in thinking it needs a tweak from the people in the know, or is there something seriously wrong?

I cant imagine this 2.3 Turbo will use any more fuel on WOT than a 3.0/3.2 Omega..... so surely this LPG kit should be able to keep up?

It has been serviced annually by Avon Autogas, and I will be taking it there for their advice, but I wanted to hear the opinions of those on here who really know their stuff.

Thankies! 

[Sir Tigger KC]

WOT?     

[TheBoy]

Probably the evapourator or the multivalve (if fitted) isn't up to the job - you need to check it isn't going lean, as that will quickly wreck the pistons...

[Broomies Mate]

Probably the evapourator or the multivalve (if fitted) isn't up to the job - you need to check it isn't going lean, as that will quickly wreck the pistons...

I'm a complete LPG novice, but if anything, I'd say it was rich.  I can definitely smell gas when sat in traffic, even though idle is bang on and very consistent.

I'll need a pro to look at it, and soon. 

[TheBoy]

Probably the evapourator or the multivalve (if fitted) isn't up to the job - you need to check it isn't going lean, as that will quickly wreck the pistons...

I'm a complete LPG novice, but if anything, I'd say it was rich.  I can definitely smell gas when sat in traffic, even though idle is bang on and very consistent.

I'll need a pro to look at it, and soon. 

I suspect its lean at WOT at high RPM

If you have a Stag lead, you can plug a laptop in to see why its errored...  ...and watch the lamdas

[chrisgixer]

If you can smell gas you have a leak. Which might be your problem at wot.

[Broomies Mate]

Now then! 

I can watch the lambda's with my ELM327.

I can get STFT and LTFT readings.....  I don't know enough about it to know what is 'in spec' and what would be wrong.  I appreciate on Gas the FT's are not going to be 'true' but what would be acceptable?

Bear in mind this is quite a highly strung 4 pot with a decent sized Mitsubishi blower on it. 

None of the Saab forums I frequent have known of one of these being Gassed.  It's a shame, because it runs sweet when not being hammered.  Unfortunately, I have a digital foot.

[Broomies Mate]

If you can smell gas you have a leak. Which might be your problem at wot.

This very much crossed my mind.  There is a warranty with the car, but the garage I bought it from admitted they have no experience with LPG...... 

[chrisgixer]

Fuel trims, long term, anything beyond +/- 10 needs adjustment via the lpg Ecu multipliers. Imo. They might vary within thar range generally.

Short terms are of little help.

There is a guide by Kevin Wood re set up and commissioning etc, iirc.

[chrisgixer]

If you have a diags lead that would help greatly. The stag software is available from the polish web site. Don't download it from anywhere else.

With said lead, you could set it to switch back to petrol in the affected Rev range to get round any top end issues, but you need to investigate the smell, with some urgency. A squirty bottle with water and washing up liquid sprayed on the plumbing (sensibly) will give bubbles.

[Broomies Mate]

If you have a diags lead that would help greatly. The stag software is available from the polish web site. Don't download it from anywhere else.

With said lead, you could set it to switch back to petrol in the affected Rev range to get round any top end issues, but you need to investigate the smell, with some urgency. A squirty bottle with water and washing up liquid sprayed on the plumbing (sensibly) will give bubbles.

Thanks Chris, I appreciate your knowledge and your concern.

I don;t currently have a lead, but I will have a look on the bay and buy one ASAP.  If you wouldn't mind, could you possibly point me in the right direction for the S/W...... PM would be the best bet, I should imagine?

Thanks again.

[chrisgixer]

...and obviously, if you undo any gas pipes, which you will need to to repair any leaks, where gloves to avoid cold burns.

[chrisgixer]

If you have a diags lead that would help greatly. The stag software is available from the polish web site. Don't download it from anywhere else.

With said lead, you could set it to switch back to petrol in the affected Rev range to get round any top end issues, but you need to investigate the smell, with some urgency. A squirty bottle with water and washing up liquid sprayed on the plumbing (sensibly) will give bubbles.

Thanks Chris, I appreciate your knowledge and your concern.

I don;t currently have a lead, but I will have a look on the bay and buy one ASAP.  If you wouldn't mind, could you possibly point me in the right direction for the S/W...... PM would be the best bet, I should imagine?

Thanks again.

You need to check exactly which Ecu is fitted to the car. There are several produced by stag...?

[Broomies Mate]

All I can see in the paperwork is Stag300Premium.

The ECU is conveniently mounted just beneath the bonnet, so getting a serial number will be nice and easy.

Thanks.

[chrisgixer]

http://www.ac.com.pl/en/produkt/297/stag-300-plus