Proform 850 dialing it in closer

Cudafever said

No not yet. my gut is telling me that it is the electric fans. The reason i say that is that the more runs i do(hot lapping) the sooner it will lock up each time. Was thinking it was because the o2 is only 10"past the collector..........Maybe it is when the fans turn on???????
Yup going to have to do some process of eliminations.

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Since you can hear the interference through the radio I would use that as your test equipment :)

First thing I would do is disconnect the alternator and fans and see if the interference goes away. If it does, start reconnecting things one at a time until it comes back and there’s your problem.

May O2 sensor is about is about 8”’ past the collector, but is have a full exhaust and don’t remember i you do or not.