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* 1991 Nissan Sentra- reduced gas mileage- where to check? - 2 messages, 2
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http://groups.google.com/group/alt.autos.nissan/t/0b5d5a4effba048b?hl=en
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TOPIC: 1991 Nissan Sentra- reduced gas mileage- where to check?
http://groups.google.com/group/alt.autos.nissan/t/0b5d5a4effba048b?hl=en
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== 1 of 2 ==
Date: Sat, Nov 12 2011 11:45 am
From: John Henderson
robbie wrote:
> I have replaced an injector about a year ago
You can get an idea whether all cylinders are running at approx
the same mixture ratio by examining the colour of the deposits on
the internal spark plug insulators.
John
== 2 of 2 ==
Date: Sun, Nov 13 2011 5:50 pm
From: al
On Nov 12, 12:19 pm, robbie <robbie.h.wil...@gmail.com> wrote:
> the factory rating for my 1.6L 4 speed manual sentra claims 25 city
> 33 highway. I have always maintained over 30mpg when I check the
> mileage between fillups. I generally do this using a full tank of gas
> so as to get a better average. Now my mileage is under 25 and has been
> as low as 22mpg. I have done a tuneup, installed a new O2 sensor,
> checked the MAF sensor, but haven't found anything out of the
> ordinary. I was wodering if I could have leaky injectors, despite the
> fact that the car runs and idles fine. I have replaced an injector
> about a year ago because it quit working entirely (kind of obvious
> when you lose a cylinder's worth of power on a 4 cylinder engine!) but
> the other 3 are original and have 160k miles on them. Any advice out
> there for me? This is my daily driver for work (30 miles/day) and I
> would love to have those mpgs back!
Defintely check the plugs as their condition can reveal a lean or rich
mixture as well as a malfunctioning cylinder. Assuming that the plugs
look fine and given that the engine seems to be running well, then
excessive drag is likely. Tire pressure is a possibility especially
at this time of year when temperatures fall. Every 10 F change in
temperature causes about a PSI change in tire pressure so it would
take a pretty drastic change in temperature to drop mileage 20%.. A
much more likely possibility is a dragging caliper. If the calipers
are not kept well lubricated and the slides free to move, then
excessive drag can occur. Does one or more tire feel hotter to the
touch than the rest after running a while? Is there any pulling while
braking? Simply jack up the car and rotate each wheel by hand. They
should be fairly free, ideally all should rotate easily. If one or
more wheel will barely budge when you try to rotate it by hand, you
found the problem. Good luck. Al
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