Gas milage

Tiny
JOSEPENA82
  • MEMBER
  • NISSAN SENTRA
I have a 01 nissan sentra, it has 140,000 miles and I am getting about 6 miles to the gallon. I have changed the oxegen sensor, and changed some fuses, and a tune up and this car still has terrible gas milage. The engien used to shake but the fuses fixed that problem, Iim on a tight budget and I cant keep taking the car to the shop. Please advise me on this subject. Thanks. :)
Sunday, January 14th, 2007 AT 1:12 AM

16 Replies

Tiny
BOOTDOG
  • MECHANIC
  • 665 POSTS
Do you smell gas anywhere? Is the engine light on?Because you could have a fuel line possibly leaking, or you might have a leaking injector. There are tests that can be done using a diagnostic scan tool, where you can pulse the injectors to see if any are leaking. Most repair shops have them, if you can't access one yourself. I hope I was helpful
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Sunday, January 14th, 2007 AT 7:11 AM
Tiny
JOSEPENA82
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I dont smell gas and the engine light is not on the car seems not to go when I step on the gas pedal, it seems to stall for a little bit before it takes of. The engine still shakes a bit but it works itself out.
8)
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Tuesday, January 16th, 2007 AT 9:28 PM
Tiny
RASMATAZ
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Have the fuel pressure check, then proceed to check the initial ignition timing.
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Wednesday, January 17th, 2007 AT 2:48 AM
Tiny
JOSEPENA82
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All of the injectors have been checked and cleaned and now my 02 sensor is popping up on the check engine light would that cause my gas milage to be so low? :|
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Tuesday, January 23rd, 2007 AT 9:57 PM
Tiny
RASMATAZ
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Your O2 might be reading lean and the computer is throwing gas to it to compensate.
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Wednesday, January 24th, 2007 AT 5:51 PM
Tiny
JOSEPENA82
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Would the o2 sensor cause my engine to shake when its idling and then it will go away, then it comes back. :(
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Friday, February 2nd, 2007 AT 6:41 PM
Tiny
RASMATAZ
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Have the OBD2 code pulled-as for the O2 it can cause your problem when on closed loop if its acting up-its job is to adjust the A/F mix. Try this clean out the throttle body, maybe the throttle plate is sticking-if not check the throttle position senso. The only way to catch the O2 is by the use of a scan tool.

There's a lot that can cause your problem, also it could be a MAF sensor or EGR. Check all these items I've mentioned.

Good Luck!
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Friday, February 2nd, 2007 AT 8:21 PM
Tiny
RASMATAZ
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Have the OBD2 code pulled-as for the O2 it can cause your problem when on closed loop if its acting up-its job is to adjust the A/F mix. Try this clean out the throttle body, maybe the throttle plate is sticking-if not check the throttle position senso. The only way to catch the O2 is by the use of a scan tool.

There's a lot that can cause your problem, also it could be a dirty MAF sensor or a ajar EGR. Check all these items I've mentioned.

Good Luck![/Quote:aff4b7788c]
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Friday, February 2nd, 2007 AT 8:23 PM
Tiny
SERVICE WRITER
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6 miles to the gallon :shock:

Is the arithmatic right? That is radical for that car.
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Friday, February 2nd, 2007 AT 8:54 PM
Tiny
JOSEPENA82
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  • 7 POSTS
The scan tool read 02 sensor, I havent bought the part yet my car now after having the injectors cleaned and checked, gets about 220 miles to the tank which is better. Now when I drive the car it revs up but no power is there. It slowly speeds up and then the power kicks in, the engine still shakes then returns to a normal idle. This repeats itself constintly. Would that be an 02 sensor problem. :(
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Saturday, February 3rd, 2007 AT 4:11 PM
Tiny
SERVICE WRITER
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Not sure if I follow you right, it kind of sounds like the transmission is slipping?
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Saturday, February 3rd, 2007 AT 5:29 PM
Tiny
RASMATAZ
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When do you shake? @ Stationary or while moving

Is it taking its sweet time to shift in gears? Like SW suspecting on the tranny

What did the scan tool says about theO2-Are they using a code reader or a scan tool-

What part that you haven't got yet

The shake do you feel it while at on a stop, then start shaking when moving.
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Saturday, February 3rd, 2007 AT 6:36 PM
Tiny
JOSEPENA82
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The car shakes when driving and while its in park. The part I am gonna buy is the o2 sensor bank 1 sensor 1. The car does take time to change gears, it sounds like the car is reving up then it goes. When in park the car shakes you can see the engine moving back and foward then it goes away then I say about ten seconds later it starts again, it does this all the time :(
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Sunday, February 4th, 2007 AT 4:17 PM
Tiny
RASMATAZ
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When was the last tune-up We'll await till you change the O2. Meantime also check the throttle position sensor initial adjustment-some does.
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Sunday, February 4th, 2007 AT 4:32 PM
Tiny
JOSEPENA82
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I had the plugs changed when the injectors were cleaned and I changed the air filter about 2 months prior. :(
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Sunday, February 4th, 2007 AT 7:44 PM
Tiny
SERVICE WRITER
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I think Rasamataz gave you the likely answer, did you change that 02?
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Monday, February 5th, 2007 AT 6:04 AM

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