Yaris hesitation when cold

#11

On Mon, 09 Nov 2009 21:19:00 GMT, "Mrcheerful" <nbkm57 (AT) hotmail (DOT) co.uk>
wrote:

Quote:

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.

Thanks, Mr Cheerful

I'll do as you suggest and see if I can get any noticable improvement.
Failing that, I don't think it's worth getting into advanced
diagnostics to try and solve a very small driveability issue that only
affects a completely cold engine. I'll wait and see what develops. ;-)

Cheers,

Stu

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Yaris hesitation when cold

Cars Maintenance General car maintenance (uk.rec.cars.maintenance)

Re: Yaris hesitation when cold - 11-10-2009 , 05:34 PM