Knock question

r@mon · Post by **r@mon** » Tue Feb 28, 2006 2:49 pm

i have noticed on several different logs that the car will show a knock count, but when i compare knock voltage to knock threshold, the knock voltage never surpassed the threshold, so i was wondering if there are other factors in determining knock or could it possibly be false knock.

Post by **Spunkster** » Tue Feb 28, 2006 3:02 pm

ignore the threshhold and voltage...they may not be good at determining knock... the best thing to do is look at the knock count...if it increases, reduce timing there and if the knock goes awaay then you have resolved it...if the knock stays then you probably have false knock created by other engine noise.

r@mon · Post by **r@mon** » Thu Mar 02, 2006 6:55 am

does anyone know exactly what the ecu uses t figure out knock, i figured it was just a mixture of knock raw voltage compared to the estimated threshold. does the ecu use any other parameters?

xactdyno · Post by **xactdyno** » Wed Mar 08, 2006 2:03 pm

if it's like AEM and some other stand alones, there is probably a table. generally the sensor becomes more sensitive (volts needed to trigger a knock) as rpm increases. there are a million things is the stock ecu and i figure they only have so much time to discover them all. always check your plugs for signs of knock or detonation.