Contour Enthusiasts Group Archives Forums General Troubleshooting Replace spark plugs - best gas mileage?

In Canada, those plugs are called to run at 1.3mm
I guess thats .050".
I run DP's on all 4 cylinders on my Zetec.
We are down to -20c at night right now in Manitoba. Cold? yes very. If your ignition system is not up to it, you are going nowhere. Same goes for the block heater if parking outside!