Did anyone find a positive solution to this? Mine has now also lost the crackle on the downshift. It has been into the dealer several time for them to try to fix, but they come up with different reasons every time. We have tried new cats, and checked all the bimodal fuses and circuits. The latest reply was:
“ECM goes into Fuel Cut-Off 1 second after Accelerator pedal is released, crackling will stop.
TCM will request some throttle/extra Revs for a manual downshift, which will re-start the injectors/crackling.
- It may be shutting injectors off as soon as the shift is done, if the Acc.Pedal hasn't been touched.
Note: Fuelling changes as the Engine warms up. Did it previously have a Coolant sensor fault?
Is it only quieter on longer trips, once it's up to full operating temperature?
If the Acc. Pedal is tapped 5% on/off during the downshift, does it do what they're expecting?
It may be the TCM has learnt shifts well enough now to not need as much help rev-matching the downshifts.
-> If you reset adaptive shift values, shift quality will suffer, but does the crackle on manual downshift increase?
Advise the customer to give the Acc.Pedal a prod when they pull the downshift paddle, that should guarantee noise.”
I tried blipping the throttle, as suggested, but no difference, it is still silent and muted. I done seem to have the lack of power though that some of you are mentioning. I do drive it hard from time to time, but there are also "curzy" days. Ironically it was one of my longer "hard drive" trips that the crackle stopped, and pretty close to 20,000km (it may have been exactly, i wasnt watching, but noticed the odo had clicked over when i got home).