Hi all, Iv'e just taken my 1994 B250 3.9l into the LPG service station and they couldn't help me as they didn't have the right software for my type of LPG system.

It idles ok on the LPG when in neutral or park, a little on the sluggish side though, sounds like it could do with a bit more gas being pumped through. When driving normally there are no problems it is just when I bring the van to a stand still with it still in drive the engine cuts out. It can be kept running by braking a bit harder and giving it some gas.

Anyone ever heard of anything like this and what the cure might be?

The only info I know about the type of system is from the cert and in the vapouriser type box it says "OMVL Super "8" ?

Am looking around for a garage that knows of the system but not having too much luck here in the UK, we're a bit backwards when it comes to LPG.

Cheers

Dave

 

I dont know anything about LPG, but are you getting any type of engine codes?

These are all guesses....
If it was the antique I drive then Id guess either the idle was set wrong or the transmission isnt down stepping properly and over loading the engine, similar to causing a stall with a manual transmission. I think the thing Im thinking of is the lockup torque converter.
maybe try driving slowly, under 15 or so, and then braking the torque converter should be still disengagued at that point. (and someone please tell me if I have this backwards.)

 

I'd look into the idle control valve or it's circuit. Your engine might just be dropping to too low of an idle to keep running.

 

Where are you in the UK, if you are in or able to travel to Norwich I can recommend someone who sorted my LPG problem out on a 94 B350. Basically, the guy who installed the LPG system fitted a carb version instead of an injection kit. This meant that when it switched to LPG, the computer would not adjust the timing and sparking etc to run on LPG. There is also a heat exchange cylinder (I think that is what it is called) which should be mounted so the length is in the direction of travel.
I had my entire system sorted out by http://www.wains-classic-rebuilds.co.uk/ . Cost me over a grand, but I felt it justified the cost. Maybe if you call him he can tell you if you have the correct system. If you need to leave the van there, they will even drop and pick you up from Norwich airport.
I now have a Statko system with AEB Millenium Lamba and OMVL R90 vaporiser installed, though I have no idea of the difference between a B250 and 350 engine!

Hope this has helped

 

The engne he has is the V6. The B150/250/350 nomenclature is related not to theengine size but the weight the chassis will support.

B150 = 1/2 Ton
B250 = 3/4 Ton
B350 = 1 Ton

Generally the V6 3.9 engine is in the B150 and B250 Models. With the 5.2 and 5.9 litre V8's in the heavier B250 and B350 chassis. The 1500/2500/3500 of the newer model chassis break out about the same way.

 

Again, no idea if this is relavent or not, but be aware that LPG systems require spark plugs with a larger gap, I believe 2mm extra. You also need to run it on gas/petrol to see if the van behaves the same way .. too many people jump at an LPG issue when it has nothing to do with it. P.S. I think it sucks that petrol/gas prices have dropped but LPG seems to stay the same!

 

Thanks for the replies guys! I took the van into another place and he had a listen, put his hand under the hood, twisted a screw on the idle i think and that was it! So much for the guy with the computer! haha.

Technology can only do so much eh.

Thanks for the advice on the spark plugs too, I didn't know they were different for LPG. Does anyone know the right model number for these spark plugs so I can check I've got the right ones in?

Thanks again