I have had my 90 Sentra for about 8 months now, i have put around 10,000 miles on it since i got it, and recently it seems to be going through a lot of gas. I decided to check and its getting 22mpg. I have straight through muffler (w/the cat), and 16" tires, my dad seems to think it has something to do with the combination of those.
Today i was installing a tach and noticed alot of the smaller rubber hoses in the engine are pretty well cracked, and maybe thats causing a pressure/vacuum problem? I sprayed carb cleaner on all of the connections i could find but it didnt start to idle any faster.
Any help with this would be appreciated! Thank you! Oh, my engine is the GA16i.
Also, i think maybe there is a gas leak, somewhere in the engine bay because (although this could be my imagination) it seems that everytime i let it sit, even for a few hours then there is less gas the next time i start it. Ive laid cardboard under it though and cant detect anything but a little oil leaking.
Also, if i run the air from outside source, it smells like fresh gas.
Sounds like its probably a fuel leak, old flexible fuel lines can weep fuel so not looking like they leak, the fuel evaporates before it get a chance to pool so you can notice the leak. Rub your fingers on then and if they smell of fuel replace the lines.
Fuel smell from the engine bay could be your charcoal canister. (fuel fumes) If you fill your gas tank,way over the full line then you will get access fuel into your charcoal canister.
The other fuel smell could be from you filler pipe (fuel tank) Might be a small pin hole in a filler pipe.
22 mpg look ok with a 16" tires. I get about same mileage with smaller tires. You have to measure mpg on a highway or on a road where you don't stop.
it can be driving habbits for the 22mpg. i got around 30 with my coupe and i have 14" stock alloys. it is a good idea to replace all cracked hoses and any high mileage item on the engine. it will be a combonation of all these factors.. good luck !
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B12 COUPE W/SR20DE R.I.P
B13 SE-R R.I.P. just to hard on cars.
Sentras have a wet manifold, this means that there is a mixture of fuel and air in the intake manifold before it enters the cylinders. In the winter, quite common for the walls of the intake manifold to be cold enough to be below the dew point of fuel vapor. This causes fuel condensation on the walls of the manifold and increases fuel consumption noticably.
Ive collected over a years worth of mileage data on my Sentra and it is clear that over the cold winter months fuel economy does decrease. I average mid 20's in the winter whereas in the summer i average around 32.
To improve economy in the winter ensure your car is in proper tune: new plugs, wires, distributor cap, and air filter are a good place to start. Also check the timing and ensure its at its proper spec. Also ensure your thermostat is properly operating. If its stuck open the car will take a long time to warm up and stay on high idle for a long time. (wasting fuel).
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