I FEEL MY NISSAN 100 NX IS FLAT IN ITS PERFORMANCE. IT DOES NOT GIVE SUDDEN INITIAL PICKUP AND ALSO THE FUEL CONSUMPTION IS HIGH . I CHANGED ITS AIR FILTERS, PLUGS & ENGINE OIL RECENTLY BUT THERE WAS NOT MUCH IMPROVEMENT. THERE IS NO PROBLEM IN STARTING THE CAR . ITS SILENCER HAS BEEN ALTERED AND REPLACED WITH A BIG ONE. IT HAS RUN 67000 MILES .
PLEASE SEND ME SOME SUGGESTIONS TO INCREASE ITS PICKUP. ITS A 1595 CC CAR.
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when you say it seems to be using too much, that is just a feeling
what you have to do is fill it right up and press the trip meter on the speedo
then you drive/use the vehicle normally until you are around 1/4 tank on the gauge
fill it right up again and record the reading on the trip meter
reset the trip meter and use normally again
repeat the process say for 4 tank fills recording each trip distance
then you will see what the fuel consumption is for example 40 liters for 400 klms is 10 liters per 100 klms or 20 galls for 200 miles is 10 gallons per 100 miles
the requirement to record distance and fuel put in will give you an accurate consumption over traffic, driving and atmospheric conditions from there you can ask --is this consumption figure around right for the car?
For sure the fuel consumption if very high specially if you are a moderate driver and do not drive at very high RPM. Now the possible areas to check must be the fuel pump calibration and the timing. If this is out of order/settings then the fuel can be wasted without utilization which can result in high consumption.
it sounds like your transmission is slipping. they make this chemical you can get at a part store, its a transmission stabalizer. it should help with the grinding noise and transitions to the other gears. also give your truck a complete tune up (oil change, fuel and air filters, spark plugs etc.) it should help with the fuel consumptions.
check the spark plugs for wear. also compare them if there is one that is black then you have a leaking injector. if they are all black, check the fuel pressure regulator, make sure the vaccume hose is attached. if it is ok then pull it off and see if it smells like there is gas in it.
Hope this helps