I HAVE searched through threads but want an answer more definative to my engine. To start off, I have a 1992 GA16DE B-13 XE. I have read before that this car is suppose to have a 13 gallon tank. I have never once got the gas level below 10 gallons. This is because according to my gas gauge, I get low at 9 gallons and really dont want to venture to test it otherwise(I dont have a gauge light, the bar reaches the E). Is anyone aware of whether or not these models come in 10 gallons? Ok, now for the gas mileage. I get around 200-220 miles to the tank, giving me about 20-23 mpg. Ill be the first to admit that I dont drive like my grandma, but this is just ridiculous. Ive read before that bad O2 sensors and a misfiring chamber can cause this drastic of a mpg drop. I tried to take my O2 sensor off today but just didnt have the right equipment aviable to get the sucker off, plus the fan shroud was in the way and didnt have the time to mess with all that stuff. Now for the misfiring. How would I tell this is the problem, I figure I would hear a less distinctive noise from the engine but it sounds pretty "full" to me. Also, not that I mention engine noise, when I do push my throttle wide open, the engine sounds a little fluidy. Sounds like the engine could be running a little rich to me.
If not, I would suggest changing your spark plugs, of course gap'd correctly.
Replace fuel filter, change your oil & filter, air filter.
If your CEL is lit , find out what codes its throwing...
P.S. check your timing and this sounds stupid, but make sure your battery terminals are nice and clean and that you have a good ground....if its really crappy, it can cause for lack in the electrical system, causing your sensors to get bad readings and the ECU to react slowly....
Other then that, let us know what else you got going on with it.
P.S.S. if you get a chance, wash down your engine for the hell of it....makes it alot easier to see what your doing. ( simple green, water and a good medium bristle with long bristle brush )
No, im not throwing a CEL, and it very well possibly could be the Spark plugs. Its been ATLEAST 7k miles since I last changed them. And stupid question, I know, but where is the fuel filter? I had the oil filter changed last time i got my oil changed, just a couple hundred miles now. And my Air filter is just fine, I have a CAI and wash it out twice a year.
I have a 97 200sx SE and I have the same mpg that you do.
I get gas when my gauge gets just below the E mark and It still only takes 9-10 gallons.
I get arround 220-240 miles on a tank if I drive normaly and 300 once when I drove like a grandma all week.
Air filter is clean, good spark plugs and the timing is right on... im clueless.
fuel fitler on ur car ? no idea....mine is located to the left of the driver side strut, right of the TB.
Got a service manual ? look at that....if not, the FSM should be posted on here somewhere.
Honestly, i have no idea about the gas tank gallon amount. Only advice I have for you though, is that you should never run your tank less than 1/4 full. Once it reachs 1/4, you should fill up.
Maybe your injectors are dirty/clogged up and your not getting good spray.
They have those additives you can buy to drop in the gas tank, which alot of people are against, and some who think its fine.....I personally use to use those gas additives that supposedly clean your injectors, and did so once a year.
I now use SeaFoam ......You can pour it in your gas tank, through a vacumm line on the intake/TB as well as in your oil system to clean that crap out as well. Just google SeaFoam .
I would probably, at this point, just suggest, changing the plugs and making sure you have the right gap ( check ur manual , cause i dont know ) as well as the wires if they seem pretty shaby....and drop some seafoam in your gas tank, and through ur vacumm line on the intake to clean out the engine and fuel injectors.
Also, the battery check i suggested earlier with the ground and what not...
Other then that, maybe flush your coolant system and tranny fluid ?
Also, tire pressure, alignment and balance....believe it or not....if your tires are overflated or underflated it can cause a small amount of decrease in mpg, same with alignment and what not.....and if you more then a few of these currently in place such as underflated tires, not aligned correctly, dirty injectors bad electrical system ......and crappy oil in the system....all that adds up.
And last but not least....driving habits.....dont know how to fix that....
This may be a dumb response on my part, but awhile back I was having the same exact problem as you... After replacing the Spark plugs, ignition wires, cap/rotor kit, air filter, fuel filter, PCV, vacuum lines, I was still having the same problem.
However, after thinking something isnt quite right here, I finally decided to test my mileage off of my actual car mileage, instead of my tripometer. Turns out, there is about a 50 miles difference between my cars actual mileage and my cars tripometer after every fll-up, go figure. So in reallity I was really getting 26-28 miles per gallon, as opposed to the 20-23 miles per gallon I thought I was getting...
By the way, I also have a 92 sentra XE w/the GA16 A/T so it could possibly be the same problem. It wouldnt hurt to look into it, if you already havent... Good luck though either way
I HAVE searched through threads but want an answer more definative to my engine. To start off, I have a 1992 GA16DE B-13 XE. I have read before that this car is suppose to have a 13 gallon tank. I have never once got the gas level below 10 gallons. This is because according to my gas gauge, I get low at 9 gallons and really dont want to venture to test it otherwise(I dont have a gauge light, the bar reaches the E). Is anyone aware of whether or not these models come in 10 gallons? Ok, now for the gas mileage. I get around 200-220 miles to the tank, giving me about 20-23 mpg. Ill be the first to admit that I dont drive like my grandma, but this is just ridiculous. Ive read before that bad O2 sensors and a misfiring chamber can cause this drastic of a mpg drop. I tried to take my O2 sensor off today but just didnt have the right equipment aviable to get the sucker off, plus the fan shroud was in the way and didnt have the time to mess with all that stuff. Now for the misfiring. How would I tell this is the problem, I figure I would hear a less distinctive noise from the engine but it sounds pretty "full" to me. Also, not that I mention engine noise, when I do push my throttle wide open, the engine sounds a little fluidy. Sounds like the engine could be running a little rich to me.
The tank is a 13.2 gallon tank. Once you reach the lowest marker on your fuel gauge (the empty marker), you have 3 gallons left for reserve.
Is yours an automatic? Anyways, bad O2 sensors, plugs, unclean throttle body, unclean gas line components will contribute to lower gas mileage. Get a bottle of Redline Fuel System Cleaner, and dump the whole thing in a full tank. It is safe, and will not hurt. It will remove water, clean fuel lines, and clean the fuel injectors. Your fuel filter is a grey and gold container close to the brake booster. It isn't hard to miss.
I have heard of SeaFoam, but I am not going to try out some product that hasn't been tried and tested for sure. RedLine makes great products, and most of all, they are safe. I personally wouldn't feel safe dumping some product into my car. Despite its great cleaning abilities, I rather stick to a product that does one job great than doing multiple jobs and who knows what chemicals are in it and what harm it can do to the engine.
If you have an Autozone, you can rent O2 sockets for $15. You just deposit the $15, use the item, and then return it and you get your money back.
Check the condition of your plugs. The condition can tell whether you are running rich or lean. Check condition of plug wires and distributor cap for dirt and debris.
The B13 fuel injectors are self-cleaning, and are made out of pintel. Todays modern fuel injector cleaners (with the exception of RedLine, and Chevron Techron) have a chemical additive that will eat away the injectors. Nissan even released a service bulletin about this. RedLine, and 3M are the only safe cleaners to use. Dump one bottle, and that's it. That's all you need. If you really want to clean the injectors and not use chemicals at all, go for higher octane gas.
Quote:
Originally Posted by psalm143
I finally decided to test my mileage off of my actual car mileage, instead of my tripometer. Turns out, there is about a 50 miles difference between my cars actual mileage and my cars tripometer after every fll-up, go figure. So in reallity I was really getting 26-28 miles per gallon, as opposed to the 20-23 miles per gallon I thought I was getting...
You can see that there is a place that displays the cars actual mileage, and there is a place where it displays the mileage you have driven since you last reset/zero'd out the tripometer/trip miles.
What I was trying to say is that, I would go to the gas station, fill up my tank, and reset the trip mileage. Once I ran to empty, I would go to the gas station, fill up, and record the mileage on the trip meter. Lets say I went 200 miles according to the trip meter on my last fill-up... Well, according to the actual cars mileage meter, I went 250 miles. Lets say it went from 171,250, to 171,500 miles...
Does that make any sense this time? For some reason my trip miles are not consistent with the cars actual miles, so instead of relying on the trip meter for how many miles I have driven, I now rely on the cars actual mileage, and just record it every time I fill up... I hope this helped you understand what I was trying to say.
Thats really odd. You should try driving a set distance (mapquest or google maps) sometime and see WHICH of your mileage markers are the most accurate.
Quote:
Originally Posted by psalm143
On the Speedometer Cluster:
You can see that there is a place that displays the cars actual mileage, and there is a place where it displays the mileage you have driven since you last reset/zero'd out the tripometer/trip miles.
What I was trying to say is that, I would go to the gas station, fill up my tank, and reset the trip mileage. Once I ran to empty, I would go to the gas station, fill up, and record the mileage on the trip meter. Lets say I went 200 miles according to the trip meter on my last fill-up... Well, according to the actual cars mileage meter, I went 250 miles. Lets say it went from 171,250, to 171,500 miles...
Does that make any sense this time? For some reason my trip miles are not consistent with the cars actual miles, so instead of relying on the trip meter for how many miles I have driven, I now rely on the cars actual mileage, and just record it every time I fill up... I hope this helped you understand what I was trying to say.
Ok, I replaced my spark plugs(the old ones were so-so) and added a bottle of Redline Injector Cleaner. So far, no noticable differences, though I dont expect the Cleaner to really show improvements to my next tank or so of gas.
Thats really odd. You should try driving a set distance (mapquest or google maps) sometime and see WHICH of your mileage markers are the most accurate.
I agree, and I did do that, with the same conclusion. My tripometer just gets stuck sometimes so its not always accurate.
Ok, I replaced my spark plugs(the old ones were so-so) and added a bottle of Redline Injector Cleaner. So far, no noticable differences, though I dont expect the Cleaner to really show improvements to my next tank or so of gas.
Check your distributor rotor/cap and sand the metal contacts clean. Use fine sandpaper. 220/400 is fine.
I HAVE searched through threads but want an answer more definative to my engine. To start off, I have a 1992 GA16DE B-13 XE. I have read before that this car is suppose to have a 13 gallon tank. I have never once got the gas level below 10 gallons. This is because according to my gas gauge, I get low at 9 gallons and really dont want to venture to test it otherwise(I dont have a gauge light, the bar reaches the E). Is anyone aware of whether or not these models come in 10 gallons? Ok, now for the gas mileage. I get around 200-220 miles to the tank, giving me about 20-23 mpg. Ill be the first to admit that I dont drive like my grandma, but this is just ridiculous. Ive read before that bad O2 sensors and a misfiring chamber can cause this drastic of a mpg drop. I tried to take my O2 sensor off today but just didnt have the right equipment aviable to get the sucker off, plus the fan shroud was in the way and didnt have the time to mess with all that stuff. Now for the misfiring. How would I tell this is the problem, I figure I would hear a less distinctive noise from the engine but it sounds pretty "full" to me. Also, not that I mention engine noise, when I do push my throttle wide open, the engine sounds a little fluidy. Sounds like the engine could be running a little rich to me.
I have read the thread and have a comment for you.
In all my efforts to improve fuel economy the only time I made a difference except when there was an obvious problem was when I replaced the O2 sensor on my Subaru Legacy. Milage was over 100k and I had the car from new.
I picked up about 1-2 mpg in town and 2 or so on the hiway. There was no CEL or indication there was a problem, and it did not recover to where mpg was when it was new, but about half way. The rest was just driving style and speed.
So if its running well and nothing is wrong yes change out the O2 sensor and let us know if you get an improvement.
I get 24 - 26 in town with my B14 1.6 5sp and drive it fast and hard or its in stop and go. 30 mpg or more on the freeway at 70 + ( it used to do 35 mpg or more but now have bigger tyres and brakes and drive faster.)
Good luck.......
I've been having the same problem.Every time I check I get very inconsistant numbers for same type of driving.It varies from 22 to 28 mpg for city driving.It gave me a reading of 31 on highway.I know my EGR valve is not working properly because my temp. sensor is not working I just am not sure I want to dish out $100 for a new sensor so I currently have the solenoid unhooked and am sending vacuum to the valve at all times which means it just operates before the engine is up to temp. If my poor mileage is not due to this my next step is to check for a vacuum leak.My plugs were very white when I changed them last.I'm thinking if I have a leak my ECU might be dumping excessive fuel to make up for the air.Except for the poor mileage and that it flunked the emmission test the car runs fine.I have to figure where to hook the vacuum gauge to somebody said a good place is at the fuel BPR.I never thought to check my mileage with my odometer against my tripometer to see how they compare it was a very good point brought up.If I ever get to the bottom of this and get a constant 28 mpg which I do'nt think is asking to much for this engine I'll get back to everyone.It really irks me because I get a constant 24 with a 91 V-6 stick camry with 190,000 which is a much faster car.TTYL
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