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Simple this time.
I've worked out that the most likely cause of lack of idle on LPG is the Lucas flap airmeter is shutting cutting off any air supply.
I've bought a "chris perfect"/Iwema flap opener.
It works on a vacuum feed and a electrical vacuum switch/Solenoid, so it only supplies the vac when the LPG system is switched over.
However, it only came with half the instructions and the company don't appear to work weekends when I emailed them.
Has anyone wired one of these in and know which terminal is which on the elctrical part and which vac "terminal" connects to which pipe.
I think I have the vac part worked out as it looks to be essentially an active T piece, with the 3rd branch of the t operated by the electrical switch part.
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Mr S
Posted a lot
10-4 Good buddy.
Posts: 2,654
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I've been away for a couple of weeks, so missed any previous threads... What car is it going on? Is it the Lucas 2am flap AFM? It shouldn't need any extra help with the flap opening...
Does the car run perfectly on petrol?
I've had loads of niggling problems with mine on my 3.5 V8 Rangie and they've almost all been attributed to air leaks around the inlet system!
Cheers, Martin
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Suzuki GSXR1000 K2
BMW R1150GS
BMW K1200RS
Chevy K5 Blazer
Chevy Suburban LT
Jaguar XKR
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Apr 29, 2007 17:20:08 GMT
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It is on a 3.5 Rangie V8.
The system fitted is a real bitsa. Looks like someone took a carb LPG kit and swapped the mixer to a 40mm plenum mounted one.
I have it adjusted so that it drives great, almost as well as on petrol.
Idling on petrol has been a real game. It wouldn't idle well at all. But I seem to have that under control, by adding clamps to the hoses that go from one side of the plenum to the other like the idle air bypass.
Problem now is, I've fitted the flap opener and worked out the wired, + and - none polorised.
But I can't get a good vac feed to it. It won't move the bar no matter which vac line I try.
Any suggestions with that?
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Apr 29, 2007 19:38:15 GMT
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are you sure its vacuum operatd? cos most of them connect to the vapouriser and use gas pressure to hold open the afm?
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Apr 29, 2007 21:03:26 GMT
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Nah, this is an Iwema vac operated one. Works on suction, with an electrically operated solenoid. The other types work on gas pressure and cost about 1/3rd of the cost vac ones.
Vac connection wise, at the plenum,
I have one on top directly behind the throttle plate, that is connected to the dizzy.
I on the drivers side of the plenum, that connects to a sphere on the drivers side inner wing that I can't find in the haynes, exiting the sphere it disappears behind the throttle linkage.
Then on the back of the plenum, there is another that also disappears behind the engine below the throttle linkage where I can't see.
Thing is, if I disconnect any of those, the engine doesn't stall or race which is what I've experienc ed in the past when disconnecting a vac hose, infact it doesn't change at all. Which concerns me.
Obviously it is drinking petrol, but it is a V8 on a hefty 4x4 with the aerodynamics of a brick, so that is to be exptected.
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