2001 sienna misfire #3

Reply
 
LinkBack Thread Tools Display Modes
Old 30 Oct 2012, 07:09 pm   #1 (permalink)
billy
Guest
  • Posts: n/a
  • User Status:


Default 2001 sienna misfire #3

have 2001 sienna in shop habital # 3 misfire code runs ruff falls on face on
take off have tried plugs had 195000 on them changed cat convertor after
testing swapped coil from 2 other cylinders misfire doesn't follow coil using
bosh kt340 scanner no lean or rich codition has me pulling out my hair

--
+--------[ SERVER SIGNATURE ]-------------+
| posted via http://www.motorsforum.com/ |
| Web, RSS and Social Media Interface to |
| alt.autos.toyota and other groups |
+-----------------------------------------+


  Reply With Quote
Old 30 Oct 2012, 08:08 pm   #2 (permalink)
Jeff Strickland
Guest
  • Posts: n/a
  • User Status:


Default Re: 2001 sienna misfire #3


"billy" <065b0505594b06f549b8b6640ba408f1_800@example.co m> wrote in message
news:234e6$50905e0e$42bb6765$7353@news.flashnewsgr oups.com...
> have 2001 sienna in shop habital # 3 misfire code runs ruff falls on face
> on
> take off have tried plugs had 195000 on them changed cat convertor after
> testing swapped coil from 2 other cylinders misfire doesn't follow coil
> using
> bosh kt340 scanner no lean or rich codition has me pulling out my hair
>


I doubt the car would know a single cylinder fuel injector was not firing
properly, so you would get the misfire on that cylinder, but not a lean code
for the bank of cylinders.

If you have a misfire on 3, and you swap the 3 and 1 coils, and the problem
remains on 3, then something unique to 3 needs to be investigated.

The definition of a misfire is that the EXPECTED WORK WAS NOT PERFORMED.
When a plug fires, the crank has to get from where it is to the next place
within a specified period of time -- the computer knows the speed, and the
gas pedal setting, so it knows that getting from here to there should take
x-amount of time. If it takes too long, then the expected work was not done,
a misfire is reported.

Things that impede the expected work are a weak fuel load. There are other
things that can make a misfire, but they should make a global misfire, not a
unique one that affects a single cylinder. I think your next diagnostic step
is to swap a fuel injector. Leave all else alone, and swap an injector and
see if the problem stays or moves. You could do a compression check because
a bad check on one cylinder could give you the problems you have.







  Reply With Quote
Old 01 Nov 2012, 06:08 pm   #3 (permalink)
billy
Guest
  • Posts: n/a
  • User Status:


Default Re: 2001 sienna misfire #3

responding to
http://www.motorsforum.com/toyota/20...-3-241643-.htm , billy
wrote:
> crwlrjeff wrote:
>
>
> "billy"
> <065b0505594b06f549b8b6640ba408f1_800@example.co m> wrote in
> message
> news:234e6$50905e0e$42bb6765$7353@news.flashnewsgr oups.com...
> > have 2001 sienna in shop habital # 3 misfire code runs ruff falls

> on face
> > on
> > take off have tried plugs had 195000 on them changed cat convertor

> after
> > testing swapped coil from 2 other cylinders misfire doesn't follow

> coil
> > using
> > bosh kt340 scanner no lean or rich codition has me pulling out my

> hair
> >

>
> I doubt the car would know a single cylinder fuel injector was not
> firing
> properly, so you would get the misfire on that cylinder, but not a lean
> code
> for the bank of cylinders.
>
> If you have a misfire on 3, and you swap the 3 and 1 coils, and the
> problem
> remains on 3, then something unique to 3 needs to be investigated.
>
> The definition of a misfire is that the EXPECTED WORK WAS NOT
> PERFORMED.
> When a plug fires, the crank has to get from where it is to the next
> place
> within a specified period of time -- the computer knows the speed, and
> the
> gas pedal setting, so it knows that getting from here to there should
> take
> x-amount of time. If it takes too long, then the expected work was not
> done,
> a misfire is reported.
>
> Things that impede the expected work are a weak fuel load. There are
> other
> things that can make a misfire, but they should make a global misfire,
> not a
> unique one that affects a single cylinder. I think your next diagnostic
> step
> is to swap a fuel injector. Leave all else alone, and swap an injector
> and
> see if the problem stays or moves. You could do a compression check
> because
> a bad check on one cylinder could give you the problems you have.
>
>
>
>
>
>
>
>



--
thanks for the advice got it idling smooth bad plug new out of the box imagine
that. but still wants to fall on its face on take off have tried since last
post tested tps was good,iac,same good, fuel pressure well within range just
wants to stutter on take off had one person tel me could be bad throttle body
but not familar with toyota motors


  Reply With Quote
Old 02 Nov 2012, 11:13 am   #4 (permalink)
Jeff Strickland
Guest
  • Posts: n/a
  • User Status:


Default Re: 2001 sienna misfire #3


"billy" <065b0505594b06f549b8b6640ba408f1_800@example.co m> wrote in message
news:e1be2$5092f2c1$42bb6765$28837@news.flashnewsg roups.com...
>
> --
> thanks for the advice got it idling smooth bad plug new out of the box
> imagine
> that. but still wants to fall on its face on take off have tried since
> last
> post tested tps was good,iac,same good, fuel pressure well within range
> just
> wants to stutter on take off had one person tel me could be bad throttle
> body
> but not familar with toyota motors
>

In a perfect world, your car will tell you where it hurts, and there's no
point in checking for a stubbed toe if the complaint is a broken arm. You
need a scan tool and a list of codes that the engine is producing. ARE THE
PLUGS THE RIGHT ONES? If you put in a variation on what the engine wants,
then the result can be erratic operation of the engine. If the engine ran
well before the plugs, and ran like crap after, then the new plugs are the
problem.

Personally, I find the multi-tip plugs to be snake oil, and they cause far
more problems than they cure. If your motor runs with what the factory puts
in, then why would you put in something else? Back in the day, right after
the wheel was first invented, one may be able to be get better performance
from an engine by replacing the plugs with plugs that are a heat range
hotter or colder, whatever, but in engines made today, the engineers have
pretty well dialed in what the motor needs to work right, and second
guessing them is usually not a good idea. You are describing what happens
when the plugs are not the factory specification.

I once bought a new Chevy -- an '85 Celebrity EuroSport -- with a supposedly
high output engine (the car was a pile of crap that could not get out of its
own way, but that's another story). After a couple of years I decided the
plugs were ready to be changed. I went to the store and got plugs out of the
catalog at the parts desk and put them in. The car ran like crap. I tried
everything and could not make it better. I got the car to a shop to be
diagnosed, and the answer was that a C was missing from the middle of the
part number. It never occurred to me to put the original plugs back in, and
this would have cured the problem.

As a diagnostic step, you should try the original plugs. If this cures the
trouble, then get more plugs EXACTLY like the plugs that came from the
factory.

The engine does not monitor fuel pump performance, and low fuel pressure
could be your problem BUT that would be a global problem, not a problem that
is unique to a single cylinder.

PS
Punctuation helps. Some people will read your last post and simply click-out
of the conversation because they cannot/will not follow along with runon
sentences that have no punctuation or visible means of determining when a
thought starts and stops. Just sayin' ...

  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 05:56 pm.

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.