Sudden poor mileage-2002 Camry

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Old 03 Oct 2005, 01:38 pm   #1 (permalink)
Big Kahuna
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Default Sudden poor mileage-2002 Camry

Greets.

I keep fairly accurate mileage in a little logbook in the glovebox. On a
trip this summer, I was happy to be getting about 38mpg when I was going
cross country.

The last time I logged about 3 weeks ago, I had about 50/50 around
town/freeway miles and got about 25mpg. Not so hot; 30 would make me
happy.

But I noticed last tankful that the needle seemed to be plunging pretty
damn fast. I checked the gallons vs the trip odometer: 18mpg!

Yikes, that's like SUV mileage! It was mostly around town mileage so
yeah, I expected crappy mileage. But it's never been this bad. I don't
have a lead foot, run a/c about 50% of the time, and the car is on Mobil
1 with regular dealer maintenance (and has about 25k miles on it). I
recently (6 months ago) had the MAF and some other sensor (forgot which
one) replaced under warranty when the check engine light came on.

Any ideas here? It makes me think something is really messed up (air
filter?). Or some sensor is seriously whacked (mixture) and not
reporting bad juju. I don't really know where to start looking, but
18mpg just ain't gonna cut it and it indicates to me something is
seriously amiss....

Thanks.
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Old 03 Oct 2005, 01:40 pm   #2 (permalink)
Big Kahuna
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Default Re: Sudden poor mileage-2002 Camry

Sorry,

This is an '02, 4 cylinder, automatic, made in Japan.
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Old 03 Oct 2005, 05:07 pm   #3 (permalink)
Ed White
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Default Re: Sudden poor mileage-2002 Camry

I think you need to wait for a couple of tankfuls before pushing the
panic button. Single tankful averages can be very misleading (even if
you are very very careful). You keep a book - do a comparison over
three or more tankfuls. Three is usually enough to detect a trend, five
is better.

It may be that you just didn't get the tank full on that particular
fill-up. It is also possible your station switched gasoline blends. Is
there any chance you got some gasoline with 5% or more alcohol? Or
maybe reformulated gasoline originally intended for another
jurisdiction? With the current "shrtage" it is possible blends have
been shuffled around. Your car might have reacted badly to a sudden
change.

Ed

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Old 04 Oct 2005, 02:32 am   #4 (permalink)
johngdole@hotmail.com
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Default Re: Sudden poor mileage-2002 Camry

Could be a faulty ECM dumping too much fuel into the engine
and/resulting in a bad catalytic converter. There is a TSB on this.
Does the car sometimes give off rotten egg smell? If so get the ECM and
cat replaced under the emission warranty.


Big Kahuna wrote:
> Greets.
>
> I keep fairly accurate mileage in a little logbook in the glovebox. On a
> trip this summer, I was happy to be getting about 38mpg when I was going
> cross country.
>
> The last time I logged about 3 weeks ago, I had about 50/50 around
> town/freeway miles and got about 25mpg. Not so hot; 30 would make me
> happy.
>
> But I noticed last tankful that the needle seemed to be plunging pretty
> damn fast. I checked the gallons vs the trip odometer: 18mpg!
>
> Yikes, that's like SUV mileage! It was mostly around town mileage so
> yeah, I expected crappy mileage. But it's never been this bad. I don't
> have a lead foot, run a/c about 50% of the time, and the car is on Mobil
> 1 with regular dealer maintenance (and has about 25k miles on it). I
> recently (6 months ago) had the MAF and some other sensor (forgot which
> one) replaced under warranty when the check engine light came on.
>
> Any ideas here? It makes me think something is really messed up (air
> filter?). Or some sensor is seriously whacked (mixture) and not
> reporting bad juju. I don't really know where to start looking, but
> 18mpg just ain't gonna cut it and it indicates to me something is
> seriously amiss....
>
> Thanks.


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Old 04 Oct 2005, 09:37 am   #5 (permalink)
NickySantoro
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Default Re: Sudden poor mileage-2002 Camry

On Mon, 03 Oct 2005 10:38:45 -0700, Big Kahuna <none@nothanks.com>
wrote:

>Greets.
>
>I keep fairly accurate mileage in a little logbook in the glovebox. On a
>trip this summer, I was happy to be getting about 38mpg when I was going
>cross country.
>
>The last time I logged about 3 weeks ago, I had about 50/50 around
>town/freeway miles and got about 25mpg. Not so hot; 30 would make me
>happy.
>
>But I noticed last tankful that the needle seemed to be plunging pretty
>damn fast. I checked the gallons vs the trip odometer: 18mpg!
>
>Yikes, that's like SUV mileage! It was mostly around town mileage so
>yeah, I expected crappy mileage. But it's never been this bad. I don't
>have a lead foot, run a/c about 50% of the time, and the car is on Mobil
>1 with regular dealer maintenance (and has about 25k miles on it). I
>recently (6 months ago) had the MAF and some other sensor (forgot which
>one) replaced under warranty when the check engine light came on.
>
>Any ideas here? It makes me think something is really messed up (air
>filter?). Or some sensor is seriously whacked (mixture) and not
>reporting bad juju. I don't really know where to start looking, but
>18mpg just ain't gonna cut it and it indicates to me something is
>seriously amiss....
>
>Thanks.

Air filter is a good place to start. How many miles on it?
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Old 05 Oct 2005, 01:59 pm   #6 (permalink)
Jason James
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Default Re: Sudden poor mileage-2002 Camry


"Big Kahuna" <none@nothanks.com> wrote in message
news:none-310E3A.10384503102005@news.stanford.edu...
> Greets.



Get the car to a mechanic, and have him perform an "exhaust gas analysis".
This will provide mixture information and emissions. All will be revealed
with this 5 minute test.

Jason


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Old 07 Oct 2005, 08:57 pm   #7 (permalink)
TheDoctor
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Default Re: Sudden poor mileage-2002 Camry - rotten egg

johngdole@hotmail.com says...
> Could be a faulty ECM dumping too much fuel into the engine
> and/resulting in a bad catalytic converter. There is a TSB on this.
> Does the car sometimes give off rotten egg smell? If so get the ECM and
> cat replaced under the emission warranty.


Wait. Now you have my attention.

My 2002 Camry is now belching sulfur (rotten egg smell). I am having NO
issues related bad mileage (get around 33 MPG) or otherwise - just the
smell. Are you suggesting that the emission warranty is longer than the
normal warranty, which I am way past? You also seem to be suggesting
that a car should NEVER have a rotten egg smell, and if it does,
something needs fixin. Correct?

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Old 10 Oct 2005, 05:23 pm   #8 (permalink)
timbirr@mailcity.com
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Default Re: Sudden poor mileage-2002 Camry

There is a tsb -- EG003-03 -- on the smell, but it just says too bad,
mostly....

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Old 12 Oct 2005, 08:05 pm   #9 (permalink)
johngdole@hotmail.com
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Default Re: Sudden poor mileage-2002 Camry - "ROTTEN EGG" WARRANTY

True, earlier on Toyota was saying no problem with the rotten egg smell
and they won't pay for the repairs and that it's the fault of the gas
companies. But the later TSB's are advising reprogramming ECMs and
replacing catalytic converters. Looks like Toyota still hasn't learned
anything from the oil sludge public relations debacle.

I can't remember if the TSB I came across was for the Lexus ES/Toyota
Camry but can't find it now. Here are the ones for the 4Runner and
Solara. In it says the warranty is 8/80? Looks like they've extended
the rotten egg warranty like the oil sludge warranty?


http://www.autosafety.org/Toyota%200...20Catalyst.pdf

Some customers may complain of excessive sulfur dioxide odor on
2002-2004 model
year Solara vehicles equipped with the 2AZ-FE engine under the
following conditions:

Stop and go driving.
Heavy acceleration.

In order to reduce the sulfur dioxide odor, the Electronic Control
Module (ECM)
(SAE term: Powertrain Control Module/PCM) fuel cut control logic has
been modified and a new catalyst is provided. Follow the repair
procedure to reflash the ECM and replace the catalytic converter
assembly.


TSB EG020-04

Some customers may complain of excessive sulfur dioxide odor on
2003-2004
model year 4Runner (2UZ-FE) vehicles under the following conditions:
Stop and go driving.
Heavy acceleration.
In order to reduce the sulfur dioxide odor, the Electronic Control
Module (ECM)
(SAE term: Powertrain Control Module/PCM) fuel cut control logic has
been modified and
a new catalyst is provided. Follow the repair procedure to reflash the
ECM and replace
the catalytic converter assembly.



TheDoctor wrote:
>
> Wait. Now you have my attention.
>
> My 2002 Camry is now belching sulfur (rotten egg smell). I am having NO
> issues related bad mileage (get around 33 MPG) or otherwise - just the
> smell. Are you suggesting that the emission warranty is longer than the
> normal warranty, which I am way past? You also seem to be suggesting
> that a car should NEVER have a rotten egg smell, and if it does,
> something needs fixin. Correct?


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