Spark plugs at 53k

[dtech]

Well, the coil was junk and a replacement fixed the issue. ...maybe unrelated to the worn out spark plugs.
My theory was from the old days of breaker point ignitions where new points were a part of a regular tune up. I used a dwell meter to set the point gap (dwell)while cranking the ignition and adjusting the points. A single coil fed the distributor.
A must-do instruction was to ground the high tension wire from the coil to avoid coil failure.
It wasn't spelled out, but I reckoned the secondary windings dumping to nowhere was bad. So I assumed a spark jump of over 3/32" -.090" was getting close to nowhere.
The Caravan had over 200K on it with original plugs. The coil may have died of old age at the same time.

do you mean not to ground the high voltage wire - if you do you are creating a path of very low resistance which could harm (overload) the thin secondary windings. I believe I said usually larger spark gap doesn't harm the coil - but have to agree the case you mentioned is pretty extreme. I think I recall a gangsta movie where the high voltage wire of an ignition coil was applied to a person and thus used to extract a confession - would this be suitable punishment for the brother-in-law?

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