Help with 14CUX ROVERGAUGE DATA

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4.6 Engine is now running sweetly very stable idle at 950 when fully warmed up but I have baffling lambda data.

Both sides are switching around -20% on short term with the long term on both on -100%.

Can anyone enlighten me to what this is telling me ?

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Just a quick update, all is now resloved.

I found a 'dry joint' on the TPS (which is one of the new Colvern CP17 based kits)

Long Term is now 0% with lambda's both switching at around -70% to -90%

Attached run charts show approx 15 minutes of engine idling after warming up.

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blitzracing said:

Odd culprit as the TPS only controls the idle setting and full power enrichment, not your mixture during general running.

I did disconnect battery whilst doing the TPS wiring in the engine bay, so could have been the ECU resetting ?

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spitfire4v8 said:

You didn't run it long enough .. if you had you would have seen the long term trims gradually work their way negative again and the short term cycle around the mid-point.

Useful to know, it was running for 20 minutes after battery was reconnected.

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davep said:

blaze was your throttlepot plot taken before or after resolving the dry joint?

Readings seem to show a repetitive series of 9 to 10 mV glitches, indicating voltage jitter as a result of mechanical vibration maybe. The Covern spec states Output Smoothness as 0.5%, so within 3 mV max.

Throttle pot readings I have show a steady state of 625.11 mV for similar test conditions.

It was after fixing the dry joint.

Thats an interesting observation, could you log a similar RG run and send me the log file please ?