KA24E Fuel hog?

[allfoden]

I have a 1999 Nissan 2800 4X4 pickup in Uruguay assembled in Mexico that has a KA24E engine that consumes gas like its free. The best I get is about 8mpg driving easy and on short trips it is horrible on gas. I have no equipment there to do any diagnosis on my own. The Nissan dealer in Uruguay is trying to tell me that the consumption is normal and there is nothing wrong with the truck. Any ideas as to how to attack this problem short of selling the truck and getting a diesel is greatly appreciated. I was thinking of taking an ECU, MAF and oxygen sensor from a 1989 240sx and start blindly changing parts.
I also have no way to find the correct parts for the truck.

Screwed in Montevideo

[allfoden]

Wow no opinions or help?

[Packman5280]

I would think 02 sensor or MAF, do you get a check engine light at all? Have you tried any fuel system treatments, like an injector cleaner? That is deffinately way low mileage for that motor, but on a 99 it will be hard to diagnose without a code reader.

[allfoden]

No the check engine light is not on. Tried injection cleaner and no difference.

[ghettotoyota]

do not i repeat do not take parts of a 240 or i will castrate you,how dare you put car parts on a truck despite there the same motor.It's probably running rich.Go to nicoclub.com scroll downn and go to general chat post there,tell them oatmealman sent you

[allfoden]

The numbers from a gas analyzer test at idle are as follows. There was another set of data at higher rpm but I do not have the numbers.

RPM: 780

CO: 1.56%

CO2: 12.7%

HC: 123PPM

O2: 0.4%

Can anyone please look at the data in light of very poor fuel economy? And recommend where to look?

Thanks

[dvdswan]

check the IAC and TPS sensors, also when was the last time you did a tuneup? including the fuel fitler