Volvo 240 b200f

[Adrian]

I have a 1990 Volvo 240 gl auto - converted to LPG 16 mths ago - the lamba sond light being on near permanently since.

I have had a problem for the pas 12 month with the timing has reset at top dead centre not at 12 degrees before, causing the car to be a little underpowered on hills, I had put this down to the ECU and being quoted