Thread: Thinking of converting to E85.. Yes or Ne??

Originally Posted by MoarkatsINmuhtrailer

The sensor picks it up and tells the pcm to back the **** up...So yes, it is real knock. There is a problem, in this case, the downpipe and swaybar hitting eachother. Fix that, the knock goes away.

Do you mean Knock Retard or actual Knocking occuring in the engine?

The KR is always real because Knock retard is the retarding of the timing that is occurring due to the PCM picking up what it believes is knock from the knock sensors. It doesn't matter what is causing it to pull the timing. If the PCM is pulling timing and reporting KR, the KR is real.

The cause for the KR can be false, as in the knock signal can be falsified.

Unless you guys have a different defintion of KR from say the GM service manual or the HPT manual.

Originally Posted by matt5112

Do you mean Knock Retard or actual Knocking occuring in the engine?

The KR is always real because Knock retard is the retarding of the timing that is occurring due to the PCM picking up what it believes is knock from the knock sensors. It doesn't matter what is causing it to pull the timing. If the PCM is pulling timing and reporting KR, the KR is real.

The cause for the KR can be false, as in the knock signal can be falsified.

Unless you guys have a different defintion of KR from say the GM service manual or the HPT manual.