Small hickup with a Nissan Patrol

hi Boo
this is probley a tuning problem with the guy who does your tuning went bias to to gas you may have to have it tuned again and have 50 /50 tuning
SNAILBAIT

you going to have to check your codes on your computer.

It sounds like the MAS is dirty or has died.

Check your codes and see what they pop up with.

shadow

So frustrating when this happens. Unfortunately cause can be so many varients. Lets look at what you said...
1 - runs great on gas
that eliminates LPG and ENGINE
ENGINE would run sick on either fuel systems if it had a problem.

2 - Idles fairly smoothly
carby is not being throttled at this point,

3 - runs sick up until u hit 2800 - 3000 rpm,
at these revs enough fuel will be sucked through carbi even if it was ur problem.

conclusion - I would definately go with a carbi problem, could be main butterfly shaft is worn, meaning it is sealed at idle thus no air getting in, once u start to throttle it, the worn shaft is causing excessive air to go through and could be part of your problem.
Also any mechanical parts in your carby can be damaged causing your problem.

I can go on and on but reality is, you need it looked at.

My suggestions are just things i think of from what was described ok. so please if you have other suggestions, post them for boo and dont wast them to throw fuel at me.

After all we are here to help each other.
Cheers Ange

Boo,
Had the same problem with duel fuel in several carby Falcon's - rebuild carby with new seals solved the problem, they tend to dry out when running on gas, no lube.
May be something else to look at, assume the '93 still carby, (or single point fuel injection).
Rolande

If yours is the Carby motor and not the EFI, I would say the diaphrams are split/leaking in the carby. If you use the gas alot and don't change back to petrol before parking overnight or long term, the diaphrams will become brittle and stuff up over time.

If you've got the EFI model, I have no idea!