Anyone had experience with false knock retard because of noise from valkve gear, bearings or piston slap. Get periods of upto 8 deg retard when auto up changes & during light load cruise. No problem under heavy load. May be auto up change & cruise condition allows the loose bits to clank about more which the knock sensor thinks is detonation.
I'm running TunerPro RT & looking at the log files. The car drives as normal just that since I recently started logging the knock retard data I am getting retard at freeway cruise & just before the auto up changes. Cannot get the 35-40 deg cruise timing I would expect, lucky to see more than 30 degrees before retard kicks in. Intend to try some 98 octane to prove it is false knock from the sensor but interested to know if anyone else has had similar problem.
at the moment i am reading up on EFI Tuning Tips (especially GM EFI) as i would like to buy a tuner-pro RT myself i don't now if it will help you mate but check this out never know it might just help you out
VNGRPA thanks for the reply. If you are only interested in logging to start with, then use TunerPro. You will need an interface to the ALDL. TunerPro RT is only required if you are doing real time mapping. Both TunerPro & RT are free if you are happy to log-on everytime you want to use it.
False Knock Retard
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Posted - 24 Jun 2011 : 11:10:44 AM
