> >
> > >
> > >
> > > I still don't understand why it ran worst when under load at low RPM
> > > in a high gear, but OK when idle?
> >
> > low revs lots of fuel weak spark being flooded.
> > tick over little fuel sparks easy.
>
> A deficiency in the HT system always creates a misfire under high load at
> lowish (2000-3000rpm) revs when cylinder filling is at it greatest
> (co-incidentally somewhere abit before peak torque rpm) and thus compression
> is highest. A high compression requires more power to fire the plug, and
> light the mix. Also the mixture tends to be pretty lean at these speeds
> further compounding the problem, which is why, on the Zetec, they tend not
> to misfire until operating temperature and the ECU is running very lean. >
> Tim..
You guys are an education! Thanks for the replies - and be aware you've used a few more of my ever decreasing neurons to store that useful knowledge. :)
Tony