Yet, over the past few months, the ’Stang has frustrated me with a series of garage door opener circuit board and electrical maladies that had me convinced it was possessed enough for a role in a Stephen King film. It all followed a fresh set of sparkplugs, but that simple task to cure a cold-start issue seemed to disturb a hornets’ nest of issues. And the plug swap had me baffled on two fronts.
First, I noticed that the box ofAC Delco items I bought on a parts haul in the US contained only seven plugs. Perplexing, until I recalled that my luggage had contained an inspection note from the TSA the US’s Transportation Security Administration . I’ve since learnt that sparkplugs are a red flag to their screening software and need to be sampled. The omission was sorted with an NGK equivalent but, even with all eight refreshed, I suddenly had an engine running on seven, as if the 289 was under the garage door opener circuit board spell. Oddly, there was a spark from each lead, albeit not a very bright one.
A set of leads and a new coil the existing one looked to be the original was my next move to beef up the voltage. Still no joy. Must be a compression issue, then? Nope when tested, all eight cylinders measured between 130 and 150psi. That was followed by a blast around the neighbourhood in the hope that it would ‘come right’, but my efforts resulted only in a few spectacular backfires. Then I discovered that the vacuum advance on the distributor garage door opener circuit board working.