I am posting for help with two problems on my 21,000 mile 2017 5-speeder. They may be a coincidence or connected.
For the past few months it has sounded increasingly rattly, as if something is wrong with valves/tappets/rockers. It ran fine however and I put it down to the fact that they do get louder as they age. Then one day the sound started to disappear suddenly at c 3,000rpm. Above that it pulled well and the engine became unusually smooth!
I have checked under the rocker cover and looked at the cam belt (which I changed last year) and there appear no problems, although it is getting louder.
More recently my engine light has been coming on with the faults PO170 and PO173, which are both left and right cylinder "adaptive max limit". I have the Morgan 3-Wheeler Diagnostics Software v1.4 and have been able to clear the codes and reset the adaptive maps, but the faults come back together after another ten minutes driving. Logically, that would suggest a fault common to both cylinders.
I have put on a new Throttle Position Sensor and set the resting voltage to 0.5 volts, and cleaned all the other engine sensors. Fuel pressure is reading 54 psi with ignition on and engine off and the pump sounds vigorous. The air filter is fine and there seem no air leaks. I have ran the "test outputs" on the software and it shows no faults.
The car started its life with a Euro 4 ECU but Morgan swapped it back to Euro 3 under warranty. That disabled the OBDI connector, so I can't check that.
It still starts but is rough when cold, rattles like crazy then the engine light comes on.
Any suggestions gratefully received on what may be causing the problems and how I might diagnose them further. Cheers. Geoff
