Mysterious problem

Reply
 
LinkBack Thread Tools Display Modes
Old 23 Sep 2008, 11:22 am   #1 (permalink)
Craigwc
Guest
  • Posts: n/a
  • User Status:


Default Mysterious problem

I have a 1998 Toyota Camry with an intermittent problem thatís existed
for over three years. My local dealer has checked the car out and
found nothing wrong. Of course, the problem doesnít occur when he has
the car, but itís so fleeting I doubt heíd find anything even if it
did.

Every once in a while, on the order of once every 100 miles or so, the
car loses power. It doesnít stall, it just doesnít respond when I
push on the gas pedal. This will last anywhere from a few seconds to
a minute or so. Sometimes it will start to respond, sort of chug
along for a few seconds, and then falter again, or it will respond for
few hundred feet and then lose power again. Needless to say, when
this occurs pulling out into traffic itís a dangerous situation. Iíve
tried to find a common variable for when this occurs (full/low gas
tank, cold/hot weather, level/hill driving, slow/high speed, etc.),
but nothing is consistent. The only thing I noticed is that the
engine doesnít stall when this happens. If I pull over and put the
car in neutral the engine revs fine.

Some things Iíve considered: something in the gas tank, transmission
problem, fuel delivery problem. Iím not sure what the dealer checked
when I had the car in, but I assume he looked at things like filters.
His only suggestion is bring the car in again, and again, and again.
Iím down almost $150 with him and still have no clue whatís causing
this.

Any suggestions as to what might be going on here would be
appreciated.

Craig
  Reply With Quote
Old 23 Sep 2008, 11:34 am   #2 (permalink)
C. E. White
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

It sounds like a fuel delivery problem. However, the fact that it is
intermittent is puzzling. This would argue against a problem with the
fuel filter or fuel pump since that should be more consistently bad. A
plugged exhaust system can also act like this, except for the
intermittent part.

In my opinion it has to be something electronic in the fuel delivery
system. Maybe the throttle position sensor. Or I suppose it could be
the fuel pressure regulator.

This sounds like something that the dealer needs to investigate. Some
dealers have "flight recorders" that they can connect to the OBDII
connector. These can record engine parameters continuously. When the
problem occurs, the driver triggers the recorder to save the
parameters at the moment the problem occurs. Something like this is
probably what you need. Maybe you should check with a different
dealer.

I have a Davis Carchip which has the ability to record some
parameters. Something like this might help you narrow the problem
down.

Ed

"Craigwc" <craig@twcny.rr.com> wrote in message
news:23000d28-c1cb-41ed-850f-9e9fff0a87b6@k30g2000hse.googlegroups.com...
I have a 1998 Toyota Camry with an intermittent problem thatís existed
for over three years. My local dealer has checked the car out and
found nothing wrong. Of course, the problem doesnít occur when he has
the car, but itís so fleeting I doubt heíd find anything even if it
did.

Every once in a while, on the order of once every 100 miles or so, the
car loses power. It doesnít stall, it just doesnít respond when I
push on the gas pedal. This will last anywhere from a few seconds to
a minute or so. Sometimes it will start to respond, sort of chug
along for a few seconds, and then falter again, or it will respond for
few hundred feet and then lose power again. Needless to say, when
this occurs pulling out into traffic itís a dangerous situation. Iíve
tried to find a common variable for when this occurs (full/low gas
tank, cold/hot weather, level/hill driving, slow/high speed, etc.),
but nothing is consistent. The only thing I noticed is that the
engine doesnít stall when this happens. If I pull over and put the
car in neutral the engine revs fine.

Some things Iíve considered: something in the gas tank, transmission
problem, fuel delivery problem. Iím not sure what the dealer checked
when I had the car in, but I assume he looked at things like filters.
His only suggestion is bring the car in again, and again, and again.
Iím down almost $150 with him and still have no clue whatís causing
this.

Any suggestions as to what might be going on here would be
appreciated.

Craig

  Reply With Quote
Old 23 Sep 2008, 01:02 pm   #3 (permalink)
ransley
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

On Sep 23, 11:22*am, Craigwc <cr...@twcny.rr.com> wrote:
> I have a 1998 Toyota Camry with an intermittent problem thatís existed
> for over three years. *My local dealer has checked the car out and
> found nothing wrong. *Of course, the problem doesnít occur when he has
> the car, but itís so fleeting I doubt heíd find anything even if it
> did.
>
> Every once in a while, on the order of once every 100 miles or so, the
> car loses power. *It doesnít stall, it just doesnít respond when I
> push on the gas pedal. *This will last anywhere from a few seconds to
> a minute or so. *Sometimes it will start to respond, sort of chug
> along for a few seconds, and then falter again, or it will respond for
> few hundred feet and then lose power again. *Needless to say, when
> this occurs pulling out into traffic itís a dangerous situation. *Iíve
> tried to find a common variable for when this occurs (full/low gas
> tank, cold/hot weather, level/hill driving, slow/high speed, etc.),
> but nothing is consistent. *The only thing I noticed is that the
> engine doesnít stall when this happens. *If I pull over and put the
> car in neutral the engine revs fine.
>
> Some things Iíve considered: something in the gas tank, transmission
> problem, fuel delivery problem. *Iím not sure what the dealer checked
> when I had the car in, but I assume he looked at things like filters.
> His only suggestion is bring the car in again, and again, and again.
> Iím down almost $150 with him and still have no clue whatís causing
> this.
>
> Any suggestions as to what might be going on here would be
> appreciated.
>
> Craig


Sounds to me electrical, the fact it idles and at No load revs is
exactly what happend to me, it was one bad plug wire. Plugs need less
current with little gas, or a small load, when you are driving you
need alot of gas and good spark to fire it. What will cause this is a
weak coil, bad plug or wire and maybe the ignition module. My coil
would do this all the time when it rained or was real humid, I had a
loose cap. Many old models had the coil under the cap that got
contaminated with oil as the car got old, cleaning the coil often
worked, but its shutting down when current is needed, a short is
occuring somewhere.
  Reply With Quote
Old 23 Sep 2008, 01:07 pm   #4 (permalink)
m6onz5a
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

On Sep 23, 12:22*pm, Craigwc <cr...@twcny.rr.com> wrote:
> I have a 1998 Toyota Camry with an intermittent problem thatís existed
> for over three years. *My local dealer has checked the car out and
> found nothing wrong. *Of course, the problem doesnít occur when he has
> the car, but itís so fleeting I doubt heíd find anything even if it
> did.
>
> Every once in a while, on the order of once every 100 miles or so, the
> car loses power. *It doesnít stall, it just doesnít respond when I
> push on the gas pedal. *This will last anywhere from a few seconds to
> a minute or so. *Sometimes it will start to respond, sort of chug
> along for a few seconds, and then falter again, or it will respond for
> few hundred feet and then lose power again. *Needless to say, when
> this occurs pulling out into traffic itís a dangerous situation. *Iíve
> tried to find a common variable for when this occurs (full/low gas
> tank, cold/hot weather, level/hill driving, slow/high speed, etc.),
> but nothing is consistent. *The only thing I noticed is that the
> engine doesnít stall when this happens. *If I pull over and put the
> car in neutral the engine revs fine.
>
> Some things Iíve considered: something in the gas tank, transmission
> problem, fuel delivery problem. *Iím not sure what the dealer checked
> when I had the car in, but I assume he looked at things like filters.
> His only suggestion is bring the car in again, and again, and again.
> Iím down almost $150 with him and still have no clue whatís causing
> this.
>
> Any suggestions as to what might be going on here would be
> appreciated.
>
> Craig


Does it rev fine in neutral every time??? If so could be a tranny
problem.

Chas
  Reply With Quote
Old 23 Sep 2008, 02:39 pm   #5 (permalink)
ransley
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

On Sep 23, 1:07*pm, m6onz5a <corv...@comcast.net> wrote:
> On Sep 23, 12:22*pm, Craigwc <cr...@twcny.rr.com> wrote:
>
>
>
>
>
> > I have a 1998 Toyota Camry with an intermittent problem thatís existed
> > for over three years. *My local dealer has checked the car out and
> > found nothing wrong. *Of course, the problem doesnít occur when he has
> > the car, but itís so fleeting I doubt heíd find anything even if it
> > did.

>
> > Every once in a while, on the order of once every 100 miles or so, the
> > car loses power. *It doesnít stall, it just doesnít respond when I
> > push on the gas pedal. *This will last anywhere from a few seconds to
> > a minute or so. *Sometimes it will start to respond, sort of chug
> > along for a few seconds, and then falter again, or it will respond for
> > few hundred feet and then lose power again. *Needless to say, when
> > this occurs pulling out into traffic itís a dangerous situation. *Iíve
> > tried to find a common variable for when this occurs (full/low gas
> > tank, cold/hot weather, level/hill driving, slow/high speed, etc.),
> > but nothing is consistent. *The only thing I noticed is that the
> > engine doesnít stall when this happens. *If I pull over and put the
> > car in neutral the engine revs fine.

>
> > Some things Iíve considered: something in the gas tank, transmission
> > problem, fuel delivery problem. *Iím not sure what the dealer checked
> > when I had the car in, but I assume he looked at things like filters.
> > His only suggestion is bring the car in again, and again, and again.
> > Iím down almost $150 with him and still have no clue whatís causing
> > this.

>
> > Any suggestions as to what might be going on here would be
> > appreciated.

>
> > Craig

>
> Does it rev fine in neutral every time??? If so could be a tranny
> problem.
>
> Chas- Hide quoted text -
>
> - Show quoted text -


The tranny doesnt have anything to do with engine spark or fuel
delivery
  Reply With Quote
Old 23 Sep 2008, 03:19 pm   #6 (permalink)
Steve
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

Craigwc wrote:
> I have a 1998 Toyota Camry with an intermittent problem thatís existed
> for over three years. My local dealer has checked the car out and
> found nothing wrong. Of course, the problem doesnít occur when he has
> the car, but itís so fleeting I doubt heíd find anything even if it
> did.
>
> Every once in a while, on the order of once every 100 miles or so, the
> car loses power. It doesnít stall, it just doesnít respond when I
> push on the gas pedal. This will last anywhere from a few seconds to
> a minute or so. Sometimes it will start to respond, sort of chug
> along for a few seconds, and then falter again, or it will respond for
> few hundred feet and then lose power again. Needless to say, when
> this occurs pulling out into traffic itís a dangerous situation. Iíve
> tried to find a common variable for when this occurs (full/low gas
> tank, cold/hot weather, level/hill driving, slow/high speed, etc.),
> but nothing is consistent. The only thing I noticed is that the
> engine doesnít stall when this happens. If I pull over and put the
> car in neutral the engine revs fine.
>
> Some things Iíve considered: something in the gas tank, transmission
> problem, fuel delivery problem. Iím not sure what the dealer checked
> when I had the car in, but I assume he looked at things like filters.
> His only suggestion is bring the car in again, and again, and again.
> Iím down almost $150 with him and still have no clue whatís causing
> this.
>
> Any suggestions as to what might be going on here would be
> appreciated.
>
> Craig


A 1998 vehicle should be OBD-II compliant. Right after one of these
incidents there's a good chance that you'd at least have a "pending"
error code set, even if it didn't happen enough times to actually set
the code. Get a code reader and pull codes *right* after it happens. My
bet is on something like the throttle position sensor or the MAP (or
MAF, whichever this vehicle uses) sensor.

Could also be a fuel pump about to fail, or a fuel pump relay cutting
out letting the fuel pressure drop too low. THAT one won't set a code,
unfortunately.
  Reply With Quote
Old 23 Sep 2008, 06:32 pm   #7 (permalink)
Don Phillipson
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

> "Craigwc" <craig@twcny.rr.com> wrote in message
> news:23000d28-c1cb-41ed-850f-9e9fff0a87b6@k30g2000hse.googlegroups.com...
> I have a 1998 Toyota Camry with an intermittent problem thatís existed
> for over three years. My local dealer has checked the car out and
> found nothing wrong. Of course, the problem doesnít occur when he has
> the car, but itís so fleeting I doubt heíd find anything even if it
> did.
>
> Every once in a while, on the order of once every 100 miles or so, the
> car loses power. It doesnít stall, it just doesnít respond when I
> push on the gas pedal. This will last anywhere from a few seconds to
> a minute or so. Sometimes it will start to respond, sort of chug
> along for a few seconds, and then falter again, or it will respond for
> few hundred feet and then lose power again.


"C. E. White" <cewhite3@removemindspring.com> wrote in message
news:48d91ab4$1@kcnews01...
> It sounds like a fuel delivery problem. However, the fact that it is
> intermittent is puzzling. This would argue against a problem with the
> fuel filter or fuel pump since that should be more consistently bad. A
> plugged exhaust system can also act like this, except for the
> intermittent part.


Symptoms described are exactly those of our Russian-built
Lada when 3 or 4 years old (1980) caused by rust in the
fuel system, spalled off the surface of the fuel tank. (When we
emptied the tank and removed it, shaking it sounded like maracas.)

--
Don Phillipson
Carlsbad Springs
(Ottawa, Canada)


  Reply With Quote
Old 23 Sep 2008, 11:50 pm   #8 (permalink)
johngdole@hotmail.com
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

Check fuel pump amperage draw and see if you have a loaded fuel filter
or weak fuel pump.

Throttle body position sensor can be checked with an ohmmeter easily.

FYI, check Autozone's free repair guide.



On Sep 23, 9:22*am, Craigwc <cr...@twcny.rr.com> wrote:
> I have a 1998 Toyota Camry with an intermittent problem thatís existed
> for over three years. *My local dealer has checked the car out and
> found nothing wrong. *Of course, the problem doesnít occur when he has
> the car, but itís so fleeting I doubt heíd find anything even if it
> did.
>
> Every once in a while, on the order of once every 100 miles or so, the
> car loses power. *It doesnít stall, it just doesnít respond when I
> push on the gas pedal. *This will last anywhere from a few seconds to
> a minute or so. *Sometimes it will start to respond, sort of chug
> along for a few seconds, and then falter again, or it will respond for
> few hundred feet and then lose power again. *Needless to say, when
> this occurs pulling out into traffic itís a dangerous situation. *Iíve
> tried to find a common variable for when this occurs (full/low gas
> tank, cold/hot weather, level/hill driving, slow/high speed, etc.),
> but nothing is consistent. *The only thing I noticed is that the
> engine doesnít stall when this happens. *If I pull over and put the
> car in neutral the engine revs fine.
>
> Some things Iíve considered: something in the gas tank, transmission
> problem, fuel delivery problem. *Iím not sure what the dealer checked
> when I had the car in, but I assume he looked at things like filters.
> His only suggestion is bring the car in again, and again, and again.
> Iím down almost $150 with him and still have no clue whatís causing
> this.
>
> Any suggestions as to what might be going on here would be
> appreciated.
>
> Craig


  Reply With Quote
Old 24 Sep 2008, 12:33 pm   #9 (permalink)
Stubby
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

I had an old car that would run OK most of the time but would stall out
going up a long hill or when I'd accelerate for awhile. It turned out to
be a fuel filter restricting, but not cutting off, the fuel to the
carburetor. The engine could run for a while on what gas there was in the
carb as long as the reduced flow was sufficient to refill it.

"Craigwc" <craig@twcny.rr.com> wrote in message
news:23000d28-c1cb-41ed-850f-9e9fff0a87b6@k30g2000hse.googlegroups.com...
I have a 1998 Toyota Camry with an intermittent problem thatís existed
for over three years. My local dealer has checked the car out and
found nothing wrong. Of course, the problem doesnít occur when he has
the car, but itís so fleeting I doubt heíd find anything even if it
did.

Every once in a while, on the order of once every 100 miles or so, the
car loses power. It doesnít stall, it just doesnít respond when I
push on the gas pedal. This will last anywhere from a few seconds to
a minute or so. Sometimes it will start to respond, sort of chug
along for a few seconds, and then falter again, or it will respond for
few hundred feet and then lose power again. Needless to say, when
this occurs pulling out into traffic itís a dangerous situation. Iíve
tried to find a common variable for when this occurs (full/low gas
tank, cold/hot weather, level/hill driving, slow/high speed, etc.),
but nothing is consistent. The only thing I noticed is that the
engine doesnít stall when this happens. If I pull over and put the
car in neutral the engine revs fine.

Some things Iíve considered: something in the gas tank, transmission
problem, fuel delivery problem. Iím not sure what the dealer checked
when I had the car in, but I assume he looked at things like filters.
His only suggestion is bring the car in again, and again, and again.
Iím down almost $150 with him and still have no clue whatís causing
this.

Any suggestions as to what might be going on here would be
appreciated.

Craig


  Reply With Quote
Old 24 Sep 2008, 12:57 pm   #10 (permalink)
Pszemol
Guest
  • Posts: n/a
  • User Status:


Default Re: Mysterious problem

<johngdole@hotmail.com> wrote in message
news:172a9295-aecc-4206-a5fb-f71396f21aa5@n33g2000pri.googlegroups.com...
> Check fuel pump amperage draw and see if you have a loaded fuel filter
> or weak fuel pump.


How would I apply your suggestion in a real life?
What current should it read when good and what when weak?
What current should it read when the fuel filter is loaded?

  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 01:08 am.

Attribution:
Autoblog
Powered by Yahoo Answers



ToyotaLexusForum.com is an unofficial community for car enthusiasts. ToyotaLexusForum.com is not affiliated with Toyota Motor Corporation in any way.
Toyota Motor Corporation does not sponsor, support, or endorse ToyotaLexusForum.com in any way.
Copyright/trademark/sales mark infringements are not intended or implied.