Hi everyone

I have a Nissan S Cargo that won't start, it has spark and has compression so that leaves fuel.

It was running when I drove it into my unit which was a couple of months ago, when I say it was running, it was stuttering when it got hot (say after an hour of driving) but once I left it for 30 minutes it would drive fine again.

On that basis I wanted to fix the issue, I replaced the leads, plugs, coil, distributor cap, rotor arm, distributor module, air filter and welded the back box on the exhaust (can't get a new one anywhere, will have to get a custom one made at some point).

Once I did all that it was still starting.

I then decided to do a little body work, rubbing down scratches etc, I then decided to get it out into the sun to give it a really good clean and here's where the issue started, it just wouldn't start.

It turns over but won't fire, I hear bopping coming from the exhaust, like a little back fire I suppose, I also have a light on the dashboard which is the catalytic converter which is lighting up when I try to start it, could this be the issue?

When checking the spark plugs, they are bone dry although when I took the carburettor off to check it, there is a pool of fuel in the inlet manifold.

So is there in the inlet manifold, is the catalytic converter stopping the engine running or is that light only on because it's not been run for a while (well not run for long enough)

I'm not a mechanic but I tinker a lot but I cannot figure this out.

Can someone please help.