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1. 

   Transmission noise when downshifting/ Kick down.

   Using headphones, it doesn't sound anything like detonation to me. I had good results tracking down a noise using a LAV microphone off eBay and an extension cable. Used a spring clip to clamp it somewhere under the vehicle, then drove while recording with Audacity on my laptop. Any audio...

   • Words: 110
   • gummycarbs
   • Post #16
   • Oct 10, 2022
   • Forum: 80-Series Tech
2. 

   Transmission noise when downshifting/ Kick down.

   I'm not sure what you're saying. I *think* that if you set your timing to, say, 3 degrees following the FSM, that if you unplug your knock sensors then it will just stay at 3 degrees. The ECU wants to advance the timing until it detects knocking, but if it's unplugged then it just assumes...

   • Words: 100
   • gummycarbs
   • Post #8
   • Oct 7, 2022
   • Forum: 80-Series Tech
3. 

   Transmission noise when downshifting/ Kick down.

   I think it prevents the ECU from advancing the timing. I don't think the ECU retards the timing any further than the baseline setting, but I'm very much open to being proven wrong. I drove without knock sensors for a couple of days and it was truly gutless. No pinging, though. That was...

   • Words: 64
   • gummycarbs
   • Post #6
   • Oct 7, 2022
   • Forum: 80-Series Tech