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2005 Corolla rough idle

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  #1  
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chris
 
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Default 2005 Corolla rough idle - 01-18-2009 , 09:48 AM






Hi, I own a 2005 Corolla with 80k on it which I bought with 20k.
Recently, I've experienced rough idle during warm up and especially when
it is very cold out. This rough idle occurs whether the car is in
drive or park. Right away I thought it might just need some new plugs or
injector cleaning but I am not a mechanic so I don't know.
Has anyone else encountered this problem? The car runs just fine other
than this and runs normally when warmed up.
Chris



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Ray O
 
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Default Re: 2005 Corolla rough idle - 01-18-2009 , 11:31 AM







"chris" <nospam (AT) nospam (DOT) app.net> wrote

Quote:
Hi, I own a 2005 Corolla with 80k on it which I bought with 20k.
Recently, I've experienced rough idle during warm up and especially when
it is very cold out. This rough idle occurs whether the car is in
drive or park. Right away I thought it might just need some new plugs or
injector cleaning but I am not a mechanic so I don't know.
Has anyone else encountered this problem? The car runs just fine other
than this and runs normally when warmed up.
Chris
You can go to www..toyota.com and look up the maintenance intervals for your
car to see when the spark plugs should be replaced.

Also check the idle air control valve in the throttle body to make sure that
it moves freely, especially if you are often tardy in changing the engine
oil. If it is gummed up, it will stick more when cold than when warm.
--

Ray O
(correct punctuation to reply)




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  #3  
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ransley
 
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Default Re: 2005 Corolla rough idle - 01-18-2009 , 01:30 PM



On Jan 18, 9:48*am, chris <nos... (AT) nospam (DOT) app.net> wrote:
Quote:
Hi, I own a 2005 Corolla with 80k on it which I bought with 20k.
Recently, I've experienced rough idle during warm up and especially when
*it is very cold out. *This rough idle occurs whether the car is in
drive or park. Right away I thought it might just need some new plugs or
injector cleaning but I am not a mechanic so I don't know.
Has anyone else encountered this problem? *The car runs just fine other
than this and runs normally when warmed up.
Chris
At 80 plugs should help, If it has a distributor set timing, clean the
cap and rotor contacts with fine sandpaper . Try different gas. Wnem
mine runs better on high octane i know it needs a tune up. Forget
injector cleaning.


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nm5k@wt.net
 
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Default Re: 2005 Corolla rough idle - 01-18-2009 , 02:59 PM



On Jan 18, 9:48*am, chris <nos... (AT) nospam (DOT) app.net> wrote:
Quote:
Hi, I own a 2005 Corolla with 80k on it which I bought with 20k.
Recently, I've experienced rough idle during warm up and especially when
*it is very cold out. *This rough idle occurs whether the car is in
drive or park. Right away I thought it might just need some new plugs or
injector cleaning but I am not a mechanic so I don't know.
Has anyone else encountered this problem? *The car runs just fine other
than this and runs normally when warmed up.
Chris
I've noticed this on mine a few times, but it never lasts very long.
In fact, it did it a bit yesterday when it was still cold, but totally
quit by the time it was fully warmed up.
In my case, I always thought it was a slight clogging of the
injectors at idle speeds. "mine has 48k right now, so my plugs
should still be fairly good."
At 80k, it's probably about time for new plugs. But I bet it's a
slight
clogging of the injectors that is causing the miss.
Instead of a nice stream, it's probably dribbling a bit, or
something like that. Can cause it to run a bit lean, and miss
slightly. On mine, when it does this, it's not a bad miss..
About like one plug is missing a tad.. Just enough for you
to feel the roughness in the idle when sitting still vs it's
normally very smooth feel.
Goose the gas, and it seems fairly normal.
I bet it seems normal when you punch the gas.. That would
tend to make me think the plugs are capable of firing.
A bad plug will miss at most all speeds.
Checking the idle air valve would be a good idea also, just
to make sure it's not getting dirty and starting to stick.
But... I suspect a slight clogging of the injectors as as
good a suspect as any.
In fact, I think I had mine do that about a year ago a bit,
and I threw a bottle of techron in the gas, and I don't think
it did it again for about another year.
I think I'm going to run another bottle in it pretty soon.
I always use top tier gas, but with the regular grade, I
don't think they put all that much techron, or whatever
in the gas. Just barely enough to squeak by.
Anyway, what I would do is get a bottle of techron and
dump it into a tank of good grade gas. Run that tank
of gas and see if any better. If it's still missing at idle,
I'd check/clean the idle air valve just to make sure it's ok,
and then change the plugs.
I haven't had to mess with one in quite a while, but
seems to me if a idle air valve gets to sticking, it will
make it not respond like it should.
IE: if you have it in gear, and put it in park, the
rpms will jump up due to the lesser load, and the
IAV should quickly adjust the idle speed to normal,
which when warm is about 750-800 rpm or so.
About 1500+ when cold. If it seems like the control
of the idle speed is not acting as normal, it could be
the valve sticking.
But if it's adjusting itself fairly quick, and seems normal
in that regard, it's probably ok.. Sometimes a flaky
valve with make the idle go up/down, as it's trying to
adjust, but sticking a bit and not letting it react fast
enough to maintain a smooth idle speed. So it "hunts"..
BTW, a bad tank of gas with some water could
cause this too..
Anyway, I think your first initial guesses are pretty
close. I'd run some techron in the gas first, then plugs
if that doesn't work. BTW, mine is a 05 also..
The Toyota sight Ray O gave seemed to be down right
now, but I *think* the interval on those type of
plugs is about 100k miles. Not positive through.
If you change plugs, get the same exact type, even
if you have to go to a dealer. They are worth the
extra money.
But... Me thinks you have a slightly clogged injector
in the group.. Or at least, that's what I always thought
it was when mine did that. And like I say, my plugs
only have 48k right now. So they should still be ok.
Techron will clean that mess up with a tank or two..
Usually one full tank will do the trick.





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  #5  
Old   
chris
 
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Default Re: 2005 Corolla rough idle - 01-18-2009 , 07:08 PM






Thanks for your reply. Your description of the situation is completely
consistent with my experience. Thanks for your advice, I will look into
the matter and see if it helps.
Best regards
Chris


















nm5k (AT) wt (DOT) net wrote:
Quote:
On Jan 18, 9:48 am, chris <nos... (AT) nospam (DOT) app.net> wrote:
Hi, I own a 2005 Corolla with 80k on it which I bought with 20k.
Recently, I've experienced rough idle during warm up and especially when
it is very cold out. This rough idle occurs whether the car is in
drive or park. Right away I thought it might just need some new plugs or
injector cleaning but I am not a mechanic so I don't know.
Has anyone else encountered this problem? The car runs just fine other
than this and runs normally when warmed up.
Chris

I've noticed this on mine a few times, but it never lasts very long.
In fact, it did it a bit yesterday when it was still cold, but totally
quit by the time it was fully warmed up.
In my case, I always thought it was a slight clogging of the
injectors at idle speeds. "mine has 48k right now, so my plugs
should still be fairly good."
At 80k, it's probably about time for new plugs. But I bet it's a
slight
clogging of the injectors that is causing the miss.
Instead of a nice stream, it's probably dribbling a bit, or
something like that. Can cause it to run a bit lean, and miss
slightly. On mine, when it does this, it's not a bad miss..
About like one plug is missing a tad.. Just enough for you
to feel the roughness in the idle when sitting still vs it's
normally very smooth feel.
Goose the gas, and it seems fairly normal.
I bet it seems normal when you punch the gas.. That would
tend to make me think the plugs are capable of firing.
A bad plug will miss at most all speeds.
Checking the idle air valve would be a good idea also, just
to make sure it's not getting dirty and starting to stick.
But... I suspect a slight clogging of the injectors as as
good a suspect as any.
In fact, I think I had mine do that about a year ago a bit,
and I threw a bottle of techron in the gas, and I don't think
it did it again for about another year.
I think I'm going to run another bottle in it pretty soon.
I always use top tier gas, but with the regular grade, I
don't think they put all that much techron, or whatever
in the gas. Just barely enough to squeak by.
Anyway, what I would do is get a bottle of techron and
dump it into a tank of good grade gas. Run that tank
of gas and see if any better. If it's still missing at idle,
I'd check/clean the idle air valve just to make sure it's ok,
and then change the plugs.
I haven't had to mess with one in quite a while, but
seems to me if a idle air valve gets to sticking, it will
make it not respond like it should.
IE: if you have it in gear, and put it in park, the
rpms will jump up due to the lesser load, and the
IAV should quickly adjust the idle speed to normal,
which when warm is about 750-800 rpm or so.
About 1500+ when cold. If it seems like the control
of the idle speed is not acting as normal, it could be
the valve sticking.
But if it's adjusting itself fairly quick, and seems normal
in that regard, it's probably ok.. Sometimes a flaky
valve with make the idle go up/down, as it's trying to
adjust, but sticking a bit and not letting it react fast
enough to maintain a smooth idle speed. So it "hunts"..
BTW, a bad tank of gas with some water could
cause this too..
Anyway, I think your first initial guesses are pretty
close. I'd run some techron in the gas first, then plugs
if that doesn't work. BTW, mine is a 05 also..
The Toyota sight Ray O gave seemed to be down right
now, but I *think* the interval on those type of
plugs is about 100k miles. Not positive through.
If you change plugs, get the same exact type, even
if you have to go to a dealer. They are worth the
extra money.
But... Me thinks you have a slightly clogged injector
in the group.. Or at least, that's what I always thought
it was when mine did that. And like I say, my plugs
only have 48k right now. So they should still be ok.
Techron will clean that mess up with a tank or two..
Usually one full tank will do the trick.




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  #6  
Old   
Ray O
 
Posts: n/a

Default Re: 2005 Corolla rough idle - 01-19-2009 , 01:13 AM




<nm5k (AT) wt (DOT) net> wrote

On Jan 18, 9:48 am, chris <nos... (AT) nospam (DOT) app.net> wrote:
Quote:
Hi, I own a 2005 Corolla with 80k on it which I bought with 20k.
Recently, I've experienced rough idle during warm up and especially when
it is very cold out. This rough idle occurs whether the car is in
drive or park. Right away I thought it might just need some new plugs or
injector cleaning but I am not a mechanic so I don't know.
Has anyone else encountered this problem? The car runs just fine other
than this and runs normally when warmed up.
Chris
I've noticed this on mine a few times, but it never lasts very long.
In fact, it did it a bit yesterday when it was still cold, but totally
quit by the time it was fully warmed up.
In my case, I always thought it was a slight clogging of the
injectors at idle speeds. "mine has 48k right now, so my plugs
should still be fairly good."
At 80k, it's probably about time for new plugs. But I bet it's a
slight
clogging of the injectors that is causing the miss.
Instead of a nice stream, it's probably dribbling a bit, or
something like that. Can cause it to run a bit lean, and miss
slightly. On mine, when it does this, it's not a bad miss..
About like one plug is missing a tad.. Just enough for you
to feel the roughness in the idle when sitting still vs it's
normally very smooth feel.
Goose the gas, and it seems fairly normal.
I bet it seems normal when you punch the gas.. That would
tend to make me think the plugs are capable of firing.
A bad plug will miss at most all speeds.
Checking the idle air valve would be a good idea also, just
to make sure it's not getting dirty and starting to stick.
But... I suspect a slight clogging of the injectors as as
good a suspect as any.
In fact, I think I had mine do that about a year ago a bit,
and I threw a bottle of techron in the gas, and I don't think
it did it again for about another year.
I think I'm going to run another bottle in it pretty soon.
I always use top tier gas, but with the regular grade, I
don't think they put all that much techron, or whatever
in the gas. Just barely enough to squeak by.
Anyway, what I would do is get a bottle of techron and
dump it into a tank of good grade gas. Run that tank
of gas and see if any better. If it's still missing at idle,
I'd check/clean the idle air valve just to make sure it's ok,
and then change the plugs.
I haven't had to mess with one in quite a while, but
seems to me if a idle air valve gets to sticking, it will
make it not respond like it should.
IE: if you have it in gear, and put it in park, the
rpms will jump up due to the lesser load, and the
IAV should quickly adjust the idle speed to normal,
which when warm is about 750-800 rpm or so.
About 1500+ when cold. If it seems like the control
of the idle speed is not acting as normal, it could be
the valve sticking.
But if it's adjusting itself fairly quick, and seems normal
in that regard, it's probably ok.. Sometimes a flaky
valve with make the idle go up/down, as it's trying to
adjust, but sticking a bit and not letting it react fast
enough to maintain a smooth idle speed. So it "hunts"..
BTW, a bad tank of gas with some water could
cause this too..
Anyway, I think your first initial guesses are pretty
close. I'd run some techron in the gas first, then plugs
if that doesn't work. BTW, mine is a 05 also..
The Toyota sight Ray O gave seemed to be down right
now, but I *think* the interval on those type of
plugs is about 100k miles. Not positive through.
If you change plugs, get the same exact type, even
if you have to go to a dealer. They are worth the
extra money.
But... Me thinks you have a slightly clogged injector
in the group.. Or at least, that's what I always thought
it was when mine did that. And like I say, my plugs
only have 48k right now. So they should still be ok.
Techron will clean that mess up with a tank or two..
Usually one full tank will do the trick.

*********
The Techron is not a bad idea, but I doubt if the engine is misfiring
because the OBD II system would detect random misfires and illuminate the
check engine light.

Given the symptoms the OP described, the most likely cause is a sticking
idle air control (IAC) valve or a dirty mass air flow sensor. I'd start by
cleaning the throttle body, if that doesn't work, get a gasket for the IAC
valve and clean the IAC valve.
--

Ray O
(correct punctuation to reply)




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  #7  
Old   
nm5k@wt.net
 
Posts: n/a

Default Re: 2005 Corolla rough idle - 01-19-2009 , 12:38 PM



On Jan 19, 1:13*am, "Ray O" <rokig... (AT) NOSPAMtristarassociates (DOT) com>
wrote:

Quote:
The Techron is not a bad idea, but I doubt if the engine is misfiring
because the OBD II system would detect random misfires and illuminate the
check engine light.

Given the symptoms the OP described, the most likely cause is a sticking
idle air control (IAC) valve or a dirty mass air flow sensor. *I'd start by
cleaning the throttle body, if that doesn't work, get a gasket for the IAC
valve and clean the IAC valve.
--

Ray O
(correct punctuation to reply)
Could be. I've never had the engine light come on because of it.




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