The escort has been running rather rough recently. We suspect the values are giving us grief as the engine is still running the original head that came with the car when we first purchased it back in 2006. Once stripped down it was fairly obviously to identity the problem, the continued usage of unleaded fuel on an un-converted head has completely burnt out the exhaust valves.
I can’t afford to have the valves reseated with unleaded inserts, so a replacement head will have to suffice. Luckily we have a few lying about to choose from 😀