Help – Holden (Isuzu) Crank / No Start

hey guys,

I have a 2001 Holden (Isuzu) R9 3.2L V6 Petrol Automatic Rodeo that;s been sitting in the backyard for about a month.
Before then, it was in the driveway, so i moved it from there (no problems) and parked it in the backyard (un-registered) so I could use the driveway in/out.

The other day, I went to start it up so I can move it. Tried starting, it started for a second then died. Tried again and it just cranks.

I figured it ‘might’ have been low on petrol (as it was when I moved it), so I put between 5-7L of Unleaded in… yet still issues. Every now and then (if I leave it), when I try to start it, it might do the same thing, (tried to start then died).

I read the engine may have been flooded (with fuel).. so I let it sit for a few hours… still no luck.

I removed the Spark Plugs and noticed they were a little wet, so I cleaned then up with some cleaning spray + used a little bit of sandpaper between the gap, and let them sit (inside) for the night.

next day, I re-installed them, and seemed the engine try to start again, but then just cranks..

I heard placing foot on Accelerator will put an EFI car into Flood Mode and disable Fuel Injectors, then just crank and hold for 20sec, repeating a few times. At one point doing this, it sounded as if the engine was firing a bit, but nothing. Eventually I think the battery was going flat. :dry:

Put battery on charge for the night (took several hours, think its a slow charger)

Next day, put battery back in, tried again, and similar issues.. car tried to fire a couple times, then nothing.. just cranking. I’ve removed the spark plugs again and noticed they were a little wet again and smelled a bit like fuel… could this mean the Fuel Pump / injectors are working, spraying into the cylinders ?

I also noticed Coolant level in the reservoir was empty, and taking the cap off the radiator, I couldn’t see any coolant, then I read that low coolant can cause a fault in the coolant sensor and prevent a car from starting.. not sure how true is it or not.

Im not sure when the Fuel Filter was changed last, so I was going to pickup a new one.. just in-case, should I get injector cleaner in-case injectors are blocked?

I’ve looked on youtube/forum for some testing methods, unfortunately I don’t have a Fuel Pressure tester/ nor have access to one.. Can I removed the filter, put a cloth down to catch fuel, then tried and start to see if the pump is forcing fuel out.. or is that a no-no?

I currently have the spark plugs out of the car, then used a wire brush to carefully clean the tips. They’re sitting in front of the heater as I type, trying off as much as I can.

Does anyone have ‘any’ suggestions on what I can look for ?

Thanks,