RFI from "new" '04 F150

[KO4OTL]

My cheap little VW Lupo had it's rubber spark plug cap scratched from a clumsy mechanic at some yearly maintenance check and created a small crack in the rubber (I fixed that with amalgamating rubber tape) and it then created a spark to the engine block. The ODB computer system then reported engine trouble and when reading the error code it said spark plug issue cylinder 3. I would imagine that a much more expensive F150 would have at least as good sensors for those kind of spark plug issues.

The engine can probably run with one cylinder dead, so perhaps remove that cable to the coil on one cylinder at a time and see what it does to the interference. Perhaps it's not related to the actual spark plugs and coils.

/Ubbe

No check engine light or anything. That's a good idea (assuming the ECU doesn't freak out) as far as deactivating one coil at a time. I'm pretty most of the ignition noise is coming from the driver's side of the V8.

 

[Ubbe]

I'm pretty most of the ignition noise is coming from the driver's side of the V8.

In my car, and I believe in most of them, have all electronic boxes at the drivers side and also under the hood everything related to electronic valves for ABS and so on are located at the drivers side. Sometimes there's RF interfering pules from the sensor system that sits on each wheel for the ABS/antiskid feature but gets activated when the ignition key are turned on and not only when the engine run.

/Ubbe

 

[speedway_navigator]

The OPs engine uses coil-on-plug.

That technology came from Indycar racing from what I know.

 

[otobmark]

I can tell you that a citizen band radio in that vintage of ford 4.6 will not work with the engine running. I have never had a problem VHF and up that was noticeable- as in hearing artifacts- but could not say whether or not there was any de-sense. Like OP my am broadcast radio is usable if not ideal.