Reply to post: Spark plugs on not-so-old cars...

Bright spark dev irons out light interference

IJD

Spark plugs on not-so-old cars...

On one of the early CAN-bus cars (Fiesta?) the recommended fix when the rear wiper stopped working was to fit new spark plugs...

As the spark plugs wore out the engine management system upped the juice to maintain a good spark, which caused more interference, and the rear wiper was at the far end of the CAN bus and had the weakest signal, so stopped working before anything else did.

I have respect for whichever engineer figured that out, but can imagine it must have been difficult convincing customers that they weren't being ripped off by a garage installing expensive parts for no good reason...

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