All sorted ! Having tried repeatedly, and failed, to book the car in with a local Morgan specialist, I took it to a classic car workshop that have done work for me before.
They put a smoke test on the inlet manifold and identified a couple of air leaks, one of which was the TPS.
I had also asked them to look for a fault on the electrical system as the battery would drain overnight. I was fairly certain this had been an ongoing problem. Anyway they
discovered that the supply to the Lambda sensors was the cause of the battery drain. Basically they were wired incorrectly, being supplied when the ignition was OFF and not
when it was on. I can't quite get my head around this and am surprised that the car has recently passed the MOT emissions without problem.
From your earlier thread:
I dislike advising telling people to replace components without a diagnostic verification AND a check of the wiring. Too often people present an unsupported and wrong punchline without describing the specifics of their problem. gmg
Nothing to do with the lambdas themselves
per se. Merely their wiring. A saving of 200 parts & labor. The battery drain would have been a good clue.
With a drain, the guilty component (and related problems) can be detected by removing one fuse at a time while carefully monitoring the battery with a
20 pound digital multimeter.
You also discovered that issues with their non-Morgan engines and fueling systems do not require a Morgan specialist (bless the dears!). I often have to
convince an owner NOT to transport their mog hours merely to check an engine issue or change a slave cylinder.
Good work!
gmg
