Reply to "Suby Conversion Tranny Whine"

chines1 posted:

@Meade you have an OBD-II diagnostics port, which can be scanned with a common code reader.  Most auto parts stores have these and let you use them for free.  You will always have a secondary o2 code and a data link code, but note all of the codes and I can reference exactly what they are.
4500RPM is the cutoff point that the motor defaults to if you do not have a speed signal, so a broken or disconnected speedo cabe, a slipping dust cap or a failed speed sensor will cause this.  There are other faults that will cause an early rev limit, but they are usually down around 3500RPM, such as a bad VVT solenoid or an errant throttle pedal signal.  Normal redline and hard cutout for the motor is 6800RPM, just FYI

My MAF sensor I believe was cutting in/out or missing/ bucking action somewhere around 4K.

We cleaned it and the K&N and we ODB linked it to a laptop and went for a drive and found the MAF was the culprit.  

We proved it as it disappeared with the MAF installed. 

 

P.S. The K&N one time was dirty as well as the MAF and causing it to have this symptom.  I think this should be cleaned with each oil change IMO.

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