Funny thing is, LPG is very different to methane - thankfully!
It isn't really, CNG conversions run on methane, it's got a lower calorific content but the stoichiometric ratio and Octane rating is roughly the same. Main difference is that it won't store as a liquid so has be be kept as a high pressure gas, hence Compressed Natural Gas rather than Liquified Petroleum Gas......
Sorry - a case of brain already being asleep when i typed that! What i intended to say is LPG is very different to landfill gas derived methane - even the most carefully managed gas field can give rise to "plugs" of high methane content landfill gas which can cause extremely rich running and literally torch the cylinder heads! At least LPG is pretty constant quality!
@Lairdscooby - What year is your Jeep Scooby? I've fixed a fair few cruise controls on Jeeps and other Chryslers. Very often just the vac pipe is off but on 2000+ models cruise is disabled if the MIL light is on (due to fuel trims, due to running a single point system without OBDfix). I didn't realise those Volvo engines were developed from Triumph engines... I wonder if Dai (Volvo enthusiast) will be along to comment!
Thanks for the offer Simon - it's a 1995 and it's definitely a wire pulled or broken between the steering column cowl and the wheel. Please don't ask how i know this!
As for the origins of the B18/20 engines, a bit of digging appears i sit corrected! http://cabinnaise.com/vpage/engine.htm
I was told the B18/20 was derived from the Standard-Triumph engine some 30 years ago and thinking about it i wonder if the fact that SAAB used the Dolomite-derived engine in their B20 application (early 99s and 900s) caused the confusion? Perhaps it was assumed by the person that told me that as SAAB had the OHC slant four from Triumph, Volvo had bought the OHV from them also as the engine annotations (B20) were the same.
I can only apologise for giving out incorrect information but if it's taken 30 years to find out, it can't be terrifically common knowledge!
As for the engines in the 340/440/480 Volvos, they're totally different to the B18/20 i'm talking about here. Renault did in fact turbocharge the 1.7 (Renault 5GT Turbo) themselves and the 1.4 (Renault 5 Gordini) - conversely the Volvo 360 had the B20 (Volvo) engine in A and F versions, single carb and Bosch L-Jetronic respectively. The injected versions (GLE and GLT) went very well, had two 360 GLTs, one as a company car and the other as my own, some years later.
Somewhere in Suffolk with a Jeep, 2 Rovers and a V6 Volvo