Knock exceeding target trips CEL

[Ryan C]

This was one of the features I liked from the PowerFC. Is there any way you could implement a feature to flash the Check Engine Light in the event knock exceeds what is defined in the knock target table? I like det cans as much as the next guy but I don't drive around with them on all the time. It would be nice to have a warning that a bad load of gas was received or the weather got to hot for the timing ordered. Thanks, Ryan

[Brett Whinnen]

I've got a Knock Link installed along side the G4 and knock block. I find it invaluable for giving a quick indication.

Are you running an IAT sensor in place at all? This will healp with the changes in weather via compensation tables. As far as a bad tank of fuel goes, the knock link is a real simple way and I notice it more than the small little CEL on the dash

[Cameron Moore]

Hi Ryan,

You can do this quite simply with the functionality that the G4 has.

First you set a Virtual Auxiliary to CEL.

Then you set the Auxiliary that runs your CEL to:

SW Cond 1 : Aux Virtual Value (1 if you used Virtual Aux1)

SW Cond 2: Knock > Value (What ever knock level you want it to trigger on).

Switch Logic: Cond 1 or 2.

 

This will mean your CEL will operate just as before, and also when knock goes over your set level. It will not store a fault code though.

 

If you wanted to get really tricky, set a GP Output to Knock level, feed it back into a spare An Volt. When this goes to ground it will set off the CEL and store a fault code to the AnV you selected!

 

Hope that helps.

-Cameron