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Need help with my logs which has AFR spike


Ming

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3 hours ago, DerekAE86 said:

Upload the log file as well.

But what sensor and controller are you using and how is it connected to the ECU?
Also where in the exhaust is it fitted?

here's my log.

im using AEM UEGO which is wired to the CAN in the ECU.

Fitted just at the downpipe

PC Datalog - 2023-09-7 8;07;43 am.llgx

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I've noticed the AEM X-series does sometimes fluctuate a bit, but that does seem like more than I've seen.  Is it possibly you have some type of minor air leak pre-o2 sensor? Do all spark plugs looks the same?  It is ideal to have the sensor 18-24" away from the turbine outlet.

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