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| Rick's EF Fairmont Wagon |
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Mine is now running really well. I was actually almost out of gas, hence no power under load.
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| EBMontTom |
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Hi guys,
Pretty sure ive got an OMVL system although only seem to be able to find the idle screw on the converter, and the power valve located on the air line between mixer ring and converter. Basically the car runs pretty well, with smooth power all through the rev range although the economy and performance have slowly been dropping off over time. The problem Im having is that particularly when cold, upon quickly releasing the throttle or quickly getting onto the brakes, the revs instantly drop to 1000rpm and then continue to fall as im braking. Occasionally it will stall. car runs perfectly on petrol so convinced its either the converter which Ive been told will need replacement/servicing before too long, or a tuning issue. I have adjusted the idle screw to its sweet spot. It seems as though turning it either in or out from its current position, makes it idle lower. I also experimented with turning the power valve out which seemed to provide a little more mid-range power but do nothing for the idle/decel problem. What would people suggest in terms of tuning the particular system I have? Can post pics if need be.
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| Rick's EF Fairmont Wagon |
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that's what my old one did. used to stall on me all the time when cold.
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| EBMontTom |
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Well it seems that with a bit of messing around, I seem to have temporarily fixed the problem.
As above, the idle screw on the converter was at its highest, as turning it either way would make it idle lower. So I was experimenting with turning the power valve out, assuming that the car was running lean on decel. After a bit of "drive-adjust-drive some more-adjust some more" i realised that the further i turned out the power valve, the lower the revs would drop. After turning the power valve in about 2 turns and bumping up the base idle on the TB screw, it now idles smoothly at about 800rpm. The revs still drop a little bit during hard braking but never to below 500rpm. It also seems to have improved the off-idle response, perhaps not as rich as it was before. Just thought id add this for people like Rick above, who may be having similar problems.
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| banarcus |
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I followed the instructions from the 1st post and now my cammed V8 idles better than ever! Also the car doesn't surge around corners in 2nd gear anymore, it is so drivable now, more so now than ever. Very happy days here
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| micit |
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Thanks Mcgyver, just rebuilt my OMVL and tuned to your specs- perfect. Cost me $8 tin of carby cleaner. Not bad for 886,000 AU3 ex taxi...
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| skozzy_ak |
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Quote: To tune properly you should disconnect the ISC and place a 0.75mm feeler between the throttle stops. This will stop the ECU trying to throttle up and affecting the sensitivity tune. Can someone explain this part of the instructions in a clearer term for me (ISC means nothing to me, and do i asume the throttle stops is the idle screw, and is the ECU being mentioned the cars normal Petrol ECU or the LPG ECU. Sorry, I'm just not 100% up to the terms for injection cars with all its wiz bang sensers and these newer lpg systems with managment controls. |
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| tobi |
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ISC stands for idle speed control i think, i'm wondering the same, i have a BA ex-taxi with a landi converter and wasn't sure if the BA's have an ISC?
I had trouble starting on LPG and researched to find the start solinoid was on the bottom and was prob. full of wax from the gas. so i pulled the converter off and pulled apart the solinoid and was really sticky so i cleaned it with throttle body cleaner by threebond and also filled the converter with it, just sqirted it back through the gas feed and heaps of crap came out. i also sprayed in the throttle body and the gas feed ring inside it. car starts first time and gets 2l per 100k better economy now, but i'd like to do the tune with the screws now too.
_________________ behold I give you the RB40det!!!..... |
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| Rick's EF Fairmont Wagon |
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It's amazing how simple LPG is to fix.
My car is now running sooooo nice since I got the OMVL converter in and tuned I havent touched it since August. starts first go. idles perfect. no surging or stalling. runs when cold or hot.
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| tobi |
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alas now i have another problem, my BA will start and run but turns itself off after a minute or so and the check engine light comes on just before it shuts off.
I plugged in an OBII conector but it said nothing..... im wondering if its a speed sensor or the tank solinoid, how does one dispose of 100l of lpg?
_________________ behold I give you the RB40det!!!..... |
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| ausedwagon |
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hey can anyone help my gas is different to everything else i think. i have a 94 ed wagon and the gas has the converter up on the suspension on the LH side but in front of the throttle body it has another one not both don't have 2 bolts the converter (1st in line on the suspension) has a 10mm bolt and a spring button thing on the side and the part near the throttle has a 11 i think its only a tiny bit bigger than the 10mm but the problem is i have no lowdown power at all anything under 2500-3000rpm has no guts in any gear. ive put a bigger intake on off a xh i think and that's helped over all but i have a feeling its running a lil lean.
ill try to get photos up asap
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| tobi |
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That sounds like what i have on my EA, its a vacuum type, im experiencing the same issue, no power down low and backfires if i am under 2000rpm and loaded.
_________________ behold I give you the RB40det!!!..... |
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| ausedwagon |
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i had backfiring get gas leads and a new cap and rotor that will fix it.
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| MontGas |
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Agreed with above, i replace with good lpg topgun leads, never had a back fire again.
Could some on put some photos and guides up on Complex converter cleaning. im afraid to clean mine with TB cleaner as i know it eats plastic. any tips and guides etc, arrows point at stuff, all helps. followed the guide to the tuning, best thing i ever learned! thanks guys! im going to be mucking around with porting mixer ring style mixers soon plus polishing. will see if it helps any. plus chuck some pics up and before and after measurements. |
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| nortons |
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Hi all. I have just fitted a balance pipe to my sprint gas systerm and have now got a surging problem when around 2k to 3.5k rpm. I have tried screwig in and out the 10 mm screw but still no better. Any tips¿ I will try a full tune as per this thread when i get some good weather.
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