Engine running rich

Mario, I'm guessing that would be around normal usage for city driving in a petrol v6 auto Prado? How heavy is your right boot?

Mario,
the engine has a lot more things than just being run by a processor, the processor has to have information sent to it so it can work out the best fuel load, some of these sensors are inlet temp, mass air flow meter, oxygen sensor, timing sensor and so on. If one of these stuffs up or gets contaminated with oil or other foreign material the processor gets the wrong info.

Have a good one

Theres plenty of "adjustments" ... if you know how .... sadly, its not as easy as it once was with a simple twist of a mixture screw or a change of jets.

First up tho ....

Has it just started running rich ... what litre per klm was it getting before ?
16/100 doesnt sound all that bad tho ?

What distance is the fuel useage calculated over ?

Is that the trip computer average or the "real time" useage display ?

Have you changed fuel supplier or fuel type to that ethanol garbage ?

Is the temp gauge indicating a colder running temp than normal ?

Have you checked for engine codes ?

Just a guess but most likely you have a problem with an upstream O2 sensor.

Mario you do not say how many ks it has covered. But if more then 150000ks then your oxygen sensor is suspect also fuel filter. My Jacks economy went down hill at 160000ks, replaced oxygen sensor and fuel filter. Just recorded 14/100 towing 4.2 m boat packed to the gunwhales with camping gear. I get 15/100 arround town but myn is man. Wife auto Jack would be up arround 18 on short trips.
Do not take it to a dealer take it to a specialist engine tuner.
One more thing clean the throttle body with carby clean this did help my wifes Jack.It is an easy job on most engines.
Prados are normally a bit better on fuel then Jacks all things being equal.
Cheers Pete

Take it to a good auto elect and have it put on the machine that checkes the CODES and see if some of them are out of wack.....if so they can put the right Codes back in.....i have just had the Commodore fixed and all is well again.

Cheers for now...Williamh...Bunbury...WA.

Hi,
Your 98 prado being the second series, does not have an oxygen sensor in the exhaust, so it won't be that.

The most common cause of high fuel consumption after a heavy right foot, E10 fuel etc, is due to the airflow sensor (which is located just after the air filter) getting a little dusty / dirty. It should be carefully cleaned with spray carbie cleaner or similar.

Cheers,
Mal

g'day Mario,
I have a 2001 prado with the 3.4 and auto, after trying the recommended checks like, air filters,plugs etc. and a computer check up.It would be worth a try of putting in a fuel system cleaner with a couple of tanks of fuel,and see how you go, maybe it would help.Also with my Prado ,when it starts ,it blows a little lighter coloured exhaust until the auto choke goes off, you can tell by listening and watching the revs, maybe yours is not shutting off. hope this helps.Cheers

"it is a vehcle i just bought i done 200 klm and used 30 to 35 ltrs on a empty vehicle"

Mario,
When you have more accurate information, then ask again.
I'm guessing your vehicle is normal for a 3.4L auto Prado.