This morning I added intake air and engine temperature recording to the live data and got the trace below.
From the above the engine temperature sensor appears ok - started at ambient and gradually increased as the engine warmed up. The recording above is with the engine started from cold and left to idle, no accelerator pedal applied.
What I have discovered is that the exhaust is leaking at both ends of the flexible section between manifold and the section that connects to the cat. Would this cause issues with running?
I've checked the inlet manifold as far I can gain access and no obvious leaks. Next step to remove plugs and check colour and condition.
With respect to the function of the two lambda sensors - I understand the first one on the exhaust manifold provides info to the ecu to adjust the mixture, and the second after the cat allows further mixture trimming to ensure emissions control?
Any suggestions on what to look at next gratefully received.