Volvo Owners Club Forum - View Single Post - Best LPG Set-up for 1989 740 GL with B230F

Clifford Pope · Jun 12th, 2009, 13:57

I'm new to this, having only just bought a 240 with a very similar conversion to yours.
But I have just learnt that it is very important that the pipe to the Idle Air Valve is downstream of the mixer. Yours is UPSTREAM, so surely it won't idle because the IAV is not getting any gas.
My understanding is you need a mixer with Idle air tapping, ie 2 pipe connections, one for gas, one for idle air.

The installer who did mine was aware of this, and cut the original plastic duct just behind the bit where the two hoses join, and then inserted a mixer just like yours upstream. But a proper 2-pipe mixer would be better.

Jun 12th, 2009, 13:57	#8
Clifford Pope Not an expert but ... Last Online: Yesterday 08:06 Join Date: Dec 2001 Location: Boncath	I'm new to this, having only just bought a 240 with a very similar conversion to yours. But I have just learnt that it is very important that the pipe to the Idle Air Valve is downstream of the mixer. Yours is UPSTREAM, so surely it won't idle because the IAV is not getting any gas. My understanding is you need a mixer with Idle air tapping, ie 2 pipe connections, one for gas, one for idle air. The installer who did mine was aware of this, and cut the original plastic duct just behind the bit where the two hoses join, and then inserted a mixer just like yours upstream. But a proper 2-pipe mixer would be better.