2003 Elantra - freaky loss of power - hesitation, then normal

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Last weekend I took my wife and 3 month old baby about an hour's drive
from home (by interstate) to meet friends at a restaurant. When we
pull off the interstate I hear a vibration and hear a noise from the
car, but think little of it.
We stop at a stop light at the interstate off-ramp.  When the light
turns green I can tell the car isn't responding normally to a
acceleration - there is hesitation and the vehicle is jerking.

The car is jerking and loosing power so quickly that I turn onto a
side street to get off the main road.
The car maintains a rough idle, so I get out and try to identify where
what is going on.
There is definitely a humming sound coming from near the muffler -
possibly in the fuel tank.
We're like 8 blocks from the restaurant, so I tell my wife I'm going
to try and 'make it' so we can at least get some help from our
By the time we get to the restaurant, the car will idle, but totally
bogs down and acts as if it will die if I give any pressure to the gas
pedal.... we made it, but immediately call the Hyundai hotline to let
them know we need assistance.

I didn't try to drive it home for fear we would get stuck on a hot
night with my 3 month old - somewhere on the interstate.

It may part of the issue - so I'll mention that we were down to about
an 1/8 tank of gas, but no 'low fuel' light yet.

Hyundai had it towed to the dealer (1 hour away from my home - gee
4 days later the Hyundai tech says there are no codes found in my cars
computer and two people test drove it just fine!  Yet my wife and I
both can attest that there was a problem - and it surely didn't just
magically fix itself.... or did it?

We're scared to try and drive it home, but the dealership says there's
nothing wrong with it.

I guess we'll have to just see what happens.

Researching on-line I understand it could be bad gas, bad sensors,
possibly air bubbles forming around the fuel pump after driving
several miles non-stop (vibration creates gas air bubbles which may be
sucked into the fuel pump causing the issues).

But there was definitely a hum coming from the "bleeping" gas tank...
Any advise for convincing the dealer to replace the fuel pump - even
if the computer didn't register a trouble code?

Thanks, ~ Cutlass

Re: 2003 Elantra - freaky loss of power - hesitation, then normal

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If your gas tank hums, you should enter your car on Americas Got Talent.

Could that hum be a vent or gas cap leaking?  If it is not vented properly,
it can restrict the flow of gas. It can also be temporary and neutralize
once the car is turned off, thus the ability to run normally afterwards.
Chances are, taking the cap off and putting it back on may have cured it;
and stopped the humming.

I can't think of a single reason to replace the fuel pump.  I'd replace the
cap though, just in case.  Could be other parts of the system but I'm not
totally familiar with the canister etc. so lat the pro's chime in on that

Re: 2003 Elantra - freaky loss of power - hesitation, then normal

Just my dos centavos;

Similarly something happened to me. Picked up a full tank of fuel in New
Orleans at an Amoco, made it 10 miles down the road.

Pump (mechanical) and filter full of "stuff". The pump somehow got a piece
of debris lodged in the suction side in the check valve.

Maybe your "sock" got plugged? Might be worth a check to see what kind of
volume the pump's outputting...possible filter too?


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Re: 2003 Elantra - freaky loss of power - hesitation, then normal

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This is what I was thinking too.  A piece of dirt caught just right in the
fuel pump could cause the hum you heard.  I had a similar experience too in
my F-150 a few years ago, although the sound was not a hum but more of a
clicking.  After I shut off the truck I guess the dirt made its way out of
the pump and it never happened again.


Re: 2003 Elantra - freaky loss of power - hesitation, then normal

It's normal to hear a humming from the fuel tank while the fuel pump is
running, so your description doesn't necessarily point to a faulty fuel

The vibration and lack of power you report sounds like a misfire.  Whether
caused by the fuel pump or some other cause, I'd expect one or more trouble
codes if that were indeed the case.

Here's the difficulty:  the problem with your car could be just about
anywhere.  Unless there's some sort of evidence of the nature of the
problem, replacing a fuel pump or any other part isn't terribly likely to
solve the issue.  If the problem isn't present during testing and there
are no diagnostic trouble codes, the technician has nothing more to go on
than your description.  In this case, there are so many possible causes
for the problem you describe, picking one to try isn't likely to be

Re: 2003 Elantra - freaky loss of power - hesitation, then normal

If the catalytic converter took a hit and broke up inside it'll do what your
stating. Had it happen after my wife missed the edge of a driveway and
bounced down over the curb.When cool it would run ok....but after 30-45 min
it'll come back.
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Re: 2003 Elantra - freaky loss of power - hesitation, then normal

On Jul 10, 10:22 pm, snipped-for-privacy@yahoo.com wrote:
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--------------  I KNOW THE FEELIN'  --------------


I HAVE A 2004 ELANTRA GLS, AND THE BATTERY IS almost impossible to
replace and service!

Hyundai DOESN'T want you even try to:

1)   Check the fluid level in the cells.

2)   Check the body and terminals for corrosion.

3)   Remove the old battery and install a new one.

These tasks are almost impossible for the average motorist BECAUSE THE
inspect the cell fluid levels.  And half of the bolts under the hood
on the driver's side have to be removed to free-up the battery.

See, Hyundai wants you to go to a HYUNDAI DEALER, where a battery
costs $90, plus up to $50 more to install it. And at most Hyundai
dealers I know, you have to leave your car for an entire day -- then
hope it's ready when you return in the late afternoon or early

"Aw, we're sorry, but you see we got real busy and couldn't get to
yours.  But tomorrow!"

AdvanceAuto Parts, AutoZone, Olympic Auto Parts, and Batteries Plus
sell the same battery for $52 to $69, some including free

Only problem?  They can't get a sufficient supply of them to keep 'em
in stock!

And that's what your conniving, inscrutable Hyundai folks want -- to
force you to spend more on a new battery than a normal car owner would
expect.  Parts companies list the Elantra batteries as "special."  And
that they are!

Additionally, the OWNER'S MANUAL has neither a diagram or instructions
for accessing and servicing your Hyundai Elantra battery.  Just a one-
paragraph entry that says, in effect, Be careful when servicing the

I've had my 2004 Elantra GLS for 3 years and the battery is already
shot.  Needless to say, with problems also with the air bags, brakes,
power locks, and engine noise and vibration, I've bought my last
Hyundai product!

My advice to Hyundai?  Hold up on building those factories in the
U.S.  Too many one-time customers could make for sluggish, then
anemic, sales.


Re: 2003 Elantra - freaky loss of power - hesitation, then normal

While it IS true that you cannot access the battery cells to check the
electrolyte level (something I don't like), there is NO problem
accessing or replacing the battery. Replacements are readily available
from a multitude of sources, including auto parts stores, Sears and
Walmart. How much more available could they be?

FWIW, my car was purchased in April '04 and the original battery is
still working fine after 65K+ miles.

Re: 2003 Elantra - freaky loss of power - hesitation, then normal

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You're very lucky.  My battery in a 2000 Elantra died somewhere
between 40,000 - 50,000  miles.  That was just the tip of the iceberg.

Charles R. Whealton
Charles Whealton @ pleasedontspam.com

Re: 2003 Elantra - freaky loss of power - hesitation, then normal

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Auto Batteries are not affected by mileage,it's years of service,ambient
temperature,and vibration that matters.Deep discharging them hastens
failure.Failing charging systems also hasten battery failure.(both over and

AFAIK,after about 4 years,auto lead acid batteries become a risk for

Jim Yanik
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Re: 2003 Elantra - freaky loss of power - hesitation, then normal

Jim Yanik wrote:
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Oddly enough, that's about the frequency at which I've replaced my
batteries, regardless of the make and model of vehicle they were in.


We're all here
because we're not all there.

Re: 2003 Elantra - freaky loss of power - hesitation, then normal

Chuck Whealton wrote:
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Battery life will vary, depending largely on the temps where you live.
Hot temps kill batteries faster than cold temps. Additionally, your car
may have come with a different battery than mine, since the OEM
equipment changes at times.

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