My 1997 nissan 4x4 4 cyl is idleing at 1600 rpm and burning aa lot of gas. what is my problem?

Literly 8hrs? Does it start ok? I'd guess either RPM is off and or Temp sensor or it's sensor is off.

hi there,

have you check the gas filter, pump, air filter..

`jack

this could be a lot of different things.going on here could be bad gas, clogged fuel injectors, fuel filter, fuel trim, bad pkugs and wires please tell more and what have you replaced

check the connection of all of the spark plug wires to the plugs, you may have put a wrong one on, when cleaning the gas tank as well it can dislodge a lot of dirt, cleaning injectors and a new fuel filter could solve the issue as well

I don't really know where they should be in idle on your car, but if you don't apply your gas pedal, the RPM's should be low. My 18 wheelers RPM's are down to 500 in idle position and go up to 2300 when I step on my "diesel" pedal. If in neutral or park and you step on the gas...do your RPM's go up? If yes, all should be okay.

1600 is not idle speed my friend, 600 or 700 is idle speed. You need a tuneup on your 13 year old vehicle.

check your idle control valve located on the throttle body.

have you checked the EGR (exhaist gas recirculation) valve? sometimes carbon will chip off and make them stick partially open causing extremely rough idle or wont idle at all without help from throttle

The check gauges light is normal because at 400 rpm it isn't running fast enough to build sufficient oil pressure. I am guessing maybe a vaccum leak???

is your car using carborator if yes clean it and try to replace your air filter sometime dirt sack the air and lot of gas consume