Ok, here is the situation. I recently purchased an '00 maxima for a
very good deal, has 200,000 KM no check engine light, clean inside and
out, beautiful Glacier Pearl paint job...

Symptoms of the unknown problem are:
1) 8 KM / L (roughly 19 MPG)
2) 0-60MPH in 9 Secs. (Way below the average 7.5 secs. that I see
others get)
3) Between 2500 and 3500 RPM I feel a drag when flooring it. (Like
something is holding the car back)

I recently got a highmileage oil change. Did a 4 step emissions
cleaning (which includes seafoaming), did not help at all.

Is this a MAF issue?? I've been reading that airflow and dirty sensors
are the culprit of most gas mileage and acceleration problems, but
others with the same problem did not notice a change. I took a look at
my MAF and it looked clean to me.

What else could I do to diagnose the problem?
I would really appreciate any suggestions or advice.

Thanks!!!!!!!

On May 9, 1:35 pm, assad.ja... (AT) gmail (DOT) com wrote:
It's either your O2 sensors or the knock sensor. Change the 02's first
and see what happens. Change only the 02 sensors in the exhaust
manifold, there should be 2, 1 for each cylinder bank, not the other
ones.

CD

On May 9, 12:35 pm, assad.ja... (AT) gmail (DOT) com wrote:

Agree, symptoms say it's an 02 or knock sensor. When my knock sensor
went bad, acceleration was in 10-11 second territory. 19 mpg not
really bad, though, just not that great.

Or maybe you have a spouse or g.f. putting in regular unleaded,
instead of premium !

Hi,
Knock sensor..most likely...my mileage improved dramatically when I changed
mine, 19 MPG to 28 MPG......but I have ALLOT more miles on mine......
O2 sensor will throw a code and you will get a check engine lamp, knock
sensor will NOT throw a code, so I suspect your knock sensor before an O2
sensor...there was a guy selling Nissan branded (new in the nissan parts
box) knock sensors on ebay a while back, don't know if they are still
listed.... that is where I got mine for about 1/2 the cost of the Stealers
(dealers) price
Good luck,
2Maximas

<jmattis (AT) attglobal (DOT) net> wrote

"Bitsbucket" <none (AT) none (DOT) com> wrote:

19 to 18 mpg is normal in town,,,with maybe 26 at a constant 60 mph

You got 28,,,doing what,,falling off a cliff,,????

not possible,,,

<common_ sense (AT) netscape (DOT) com> wrote

I have a 2000 Nissan Maxima SE, automatic transmission, sunroof, with
130,000 miles.

Just finished a 4894 mile, 2 week trip. from MN to Washington, DC, to
Virginia to
Florida to Mississippi to Arkansas to MN. This included lots of road
miles, but
also included a lot of city driving as I drove around the many cities I was
going thru.

My average gas mileage was - 28.16 mpg. I always used High Octane
gas.

Speed was about 5-7 miles over posted speed limit, sometime more at night.
I used cruise control a lot, and had the A/C on.
With 2 people in car, back seat half full, trunk completely full ( included
cooler with drinks, ice, snacks, etc ).

On May 18, 7:56 pm, "Bob" <not_val... (AT) yahoo (DOT) com> wrote:
Exactly. 28 mpg is entriely do-able in the 3.0. Maybe he's confusing
the 2002 and later Maximas which have the 3.5.

CD

For lo, codifus <codifus (AT) optonline (DOT) net> hath proclaimed:
I have a 2000 Infiniti I30 with the same 3.0 and 96,000 miles; I
get 21-22 mpg in town and 27-28 on the highway, pretty
consistently. (Worst tank ever was 18.5, during a period
highlighted by two ice storms.)

codifus <codifus (AT) optonline (DOT) net> wrote:


but as an "average", for a car with an EPA rating of 19 city/27
highway - not possible.

Sounds like Bob must have missed figuring in a fill up or two during
his trip.

Charles G. Hill <chaz (AT) dustbury (DOT) com> wrote:

just about the same as I get with my 2000 max SE,,

28 "average" though is not possible.