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From: Mrcheerful on 6 Nov 2009 18:22
Colin Wilson wrote:
>>> The car suffers from a hesitation when first pulling away after a
>>> cold start, and occasionaly when changing up a gear. It misfires
>>> and feels like it will stall, but never does.
>> Plug leads?
>
> I finally got around to replacing my plug leads last week, after
> putting up with my ageing Hyundai Accent doing exactly the same thing
> for a few months.
>
> Changing the leads appears to have sorted it :-)

I have an idea that the Yaris does not have any plug leads, but ICBW


From: Duncan Wood on 6 Nov 2009 19:39
On Fri, 06 Nov 2009 23:22:32 -0000, Mrcheerful <nbkm57(a)hotmail.co.uk>
wrote:

> Colin Wilson wrote:
>>>> The car suffers from a hesitation when first pulling away after a
>>>> cold start, and occasionaly when changing up a gear. It misfires
>>>> and feels like it will stall, but never does.
>>> Plug leads?
>>
>> I finally got around to replacing my plug leads last week, after
>> putting up with my ageing Hyundai Accent doing exactly the same thing
>> for a few months.
>>
>> Changing the leads appears to have sorted it :-)
>
> I have an idea that the Yaris does not have any plug leads, but ICBW
>
>

I think it's coil on plug, but they track as well.

--
Duncan Wood
From: Stu on 7 Nov 2009 01:49
"Mrcheerful" <nbkm57(a)hotmail.co.uk> wrote in
news:AsYIm.2302$Ym4.75(a)text.news.virginmedia.com:
>
> you cannot check for inlet leaks with soapy water, the leak will be
> sucking, not blowing, check for inlet leaks using a flammable liquid
> or gas, carb. cleaner is convenient with the engine running, any leaks
> that you spray over will cause a speed variation.
>
> running the larger gap may have caused a tracking issue, which may
> have damaged one or more coils.
>
>
Thanks for your replies. The ignition is indeed coil-in-cap. I'll start it
under cover of darkness in a couple of days (working nights right now)and
look for any evidence of tracking. At the same time, I'll also check again
for air leaks with whatever flammable spray I can lay my hands on. ;-)


From: Stu on 9 Nov 2009 15:51
Stu <nospam(a)thanks.com> wrote in
news:0vednX1xHqnkhWjXnZ2dnUVZ7qadnZ2d(a)brightview.co.uk:

Update

Checked under the bonnet in darkness and nothing is glowing. Done another
check for leaks with a flammable spray and nothing happened. The only idea
I have left is to disable the fuel pump and try the coils on a spare plug,
looking for a weak spark. Any other theories?

From: Mrcheerful on 9 Nov 2009 16:19
Stu wrote:
> Stu <nospam(a)thanks.com> wrote in
> news:0vednX1xHqnkhWjXnZ2dnUVZ7qadnZ2d(a)brightview.co.uk:
>
> Update
>
> Checked under the bonnet in darkness and nothing is glowing. Done
> another check for leaks with a flammable spray and nothing happened.
> The only idea I have left is to disable the fuel pump and try the
> coils on a spare plug, looking for a weak spark. Any other theories?

it is extremely difficult to see a tracking spark on 'coil on plug'
vehicles, and in any case if the misfire only occurs when the engine is
loaded (ie not when ticking over then there will be nothing to see in any
case.)

I would try a scrupulous clean of each coil pack and spray it well with
wd40, clean the outsides of the plugs well too, and then try it, if there is
an improvement then you are on the right track (no pun intended) the other
problem is that the coil may be tracking internally like mondeo ones do and
then the only way is to substitute with a known good pack.

there is also the possibility that the fault lies somewhere else completely,
such as a tdc sensor.


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