The Ford Focus Mk2 has a little problem.

The problem is that the washer jets (on the bonnet) can allow water to drip down on top of the cylinder head.
This is a quite a common problem.
Eventually water can get inside the sparkplug lead, and allow the spark voltage to leak to earth, causing a misfire.
Having had this problem this week, I would like to share with you what my local garage have done. I think this is quite neat. They have a template to make a simple protective cover like this.
If you inspect your engine (and you should), you probably won’t see the water, as it accumulates underneath that black plastic cover on top of the cylinder head.
You can buy replacement washer jets, official parts from Ford dealers. These have rubber seals, where the original parts don’t.

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