Wuppet Posted October 13, 2023 Report Share Posted October 13, 2023 Hoping for assistance. I have always had trouble with sensors failing, typically just dead no readings, put a new one in and off she goes again. at a guess 7-8 in last few years on a street car that is driven very little, although I play with combos a lot. Thunder g4+ ecu Latest setup is with 6/71 on the 496 - EFI through hat 1 of the sensors was not reporting so I replaced both with "cheapies" after deciding that the genuine (all previous) dont seem great - immediately nothing from both - I put the good one back in and still nothing. After some research here a suggestion was to add all the error reporting parameters to try and determine what is happening. Can see that I have probably been throwing good sensors in the bin, just cant see why. I have again today checked the wiring on both sensors - each wire back to ecu plug (and to ground and each other pin to ensure no short somewhere) and the power is supplied via fused 30amp relay which is switched at ecu power on - checked that it is constant 12v Got me stuffed! I have attached map and log file whilst it had 1 dud sensor,another log is after replacing both, third is after putting "known good one" back in - in chronological order Is the "pulsing on" and off (see lambda tab and log files) an indication that they are damaged? Hoping you folks can have a look at the logs etc and offer some ideas. Quote Link to comment Share on other sites More sharing options...
Confused Posted October 13, 2023 Report Share Posted October 13, 2023 I see that "Run when stalled" is disabled, which was my first thought - I've seen many sensors "killed" by sitting with ignition turned on, but not starting the engine, heating up the sensor, then when you finally start the engine, you throw cold, potentially damp air onto a very hot thin ceramic plate, shattering it. How are the sensors themselves installed? What location, what orientation? Quote Link to comment Share on other sites More sharing options...
Wuppet Posted October 13, 2023 Author Report Share Posted October 13, 2023 36 minutes ago, Confused said: I see that "Run when stalled" is disabled, which was my first thought - I've seen many sensors "killed" by sitting with ignition turned on, but not starting the engine, heating up the sensor, then when you finally start the engine, you throw cold, potentially damp air onto a very hot thin ceramic plate, shattering it. How are the sensors themselves installed? What location, what orientation? Will check that, these logs were from cold start, pretty sure that the ecu delays heating sensor until engine running sensors installed just after header collector facing around 2 & 10 oclock downwards Quote Link to comment Share on other sites More sharing options...
Wuppet Posted November 1, 2023 Author Report Share Posted November 1, 2023 Some feedback - I believe my issue was caused by noise on power line, I was drawing from same busbar as among other things the fuel pump. I have now run power direct from battery via relay and some of the sensors that previously would not reach temp are working, whilst some are not I have had the same two that previously didn't work in it for a reasonable number of road tests and shed tests without failure Quote Link to comment Share on other sites More sharing options...
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