Hey guys,

New here, I recently acquired a Hyster H70FT, with the complete cab and fingertip controls, a fairly decent machine. Its a 2006 and it has the GM Vortec 2.4L LPG engine in it.

Serial Number: L177B09417D

I'm experiencing a no-start condition, and I haven't worked much on these types of units, I'm more of a diesel guy.

I would like to walk you through the steps that I have taken so far, and how the lift is responding to everything.

The original problem. Long cranking time then briefly starts, sputters a bit and immediate decrease in RPM, then stalls.

I haven't used this lift in sometime now, so I figured I would start with the basics.

I performed a quick spark test, and #2-4 had a strong spark, while #1 did have spark, was much weaker compared to the others ( much dimmer light on the tester )

I figured it should be able to run off of 3 cylinders at the very least, so I continued on.

I disconnected the injector rail fuel inlet hose to see if there were anything coming out of it.

When I key on, a large amount of vapor was heard coming out of that hose, scared me a bit to be honest. I've done a similar test to an old Clark unit and there wasn't nearly the large amount of flow present.

So my first question, why is there vapor gases going into the injector rail when I key on, shouldn't this be vacuum activated like the much older LPG setups?

Anyways, I reconnected the hose and carried on. At least I know the lockout valve is working. The next valve after the lockout, I believe is a GFI Regulator/converter/vaporizer, has LPG in/out and two coolant hoses on it and has a small orange hose leading to the intake manifold.

I took this small orange hose off the intake manifold and I connected a hand operated vacuum pump to it. I applied maximum vacuum to this hose, approximately 25Hg and tried to start the unit.

It started, but was running pretty rough, and slowly dies down as if it was starving for fuel.

If I give it throttle while starting, I am able to rev up the engine, but then as soon as it reaches idle, it stalls.

After a few more attempts of this, the engine started to run longer and longer, I then swapped over the orange hose from the tool back onto the intake manifold and the engine was still running, which is odd because if I were to release the vacuum of the tool, the engine would stall, but that one time, i was able to swap the hose back onto the manifold.

So far my record, is having it run for about 5 minutes.

Alright so now I know it's getting fuel, and at least 3 cylinders are getting strong spark, now what about the injectors, are they working?

I started poking around at the connectors with some back-probes, to find all of the supply wires on the injectors to have similar resistances, about 14 ohms if I remember correctly. Power is present at these wires as well while cranking. I then tested the second wire, ground I'm assuming, and also assuming it could possibly be triggered by the ECM, to find some abnormal readings. The #4 injector had something around 100 ohms of resistance, while the first three injectors were in the Kohms, and one even in the Megaohms.

I thought this was weird, so I decided to check out the harness leading to the ecm, and even pulled the connectors off the ECM to check for any abnormalities.

Everything looked good, and pretty normal. ( will circle back to this later, unless you guys think this is normal )

So at this point, I'm thinking back to the fueling that I saw earlier. I have a hunch, possibly, the engine is being over-fueled, and since I didn't get the engine started until I applied vacuum to the hose between intake manifold and the GFI valve, that my next step would be to attempt to disassemble and inspect the GFI regular/converter/vaporizer. I'm expecting to find either a broken diaphragm or some sludge build up.

What do you guys think? This is as far as I have gotten so far.

I'm new with LPG systems, and also new to the brand.

If anyone knows how to retrieve fault codes without software, that would also be a great place to start.

I know where I'm heading next, but I would love to get some of your opinions.

Hope to hear from you soon!

Bye for now