scalbert

Hopefully someone may know this time:

I would assume that the ignition timing value is prior to any knock retard occurring but wanted to be sure. My guess would be that the ignition timing is the desired value but each coil is triggered based on this base value less any CF's for that cylinder.

Or at least, that is how others I have worked with reported values. Any confirmation or correction is welcome.

DAP@EPL

The overall ignition timing is after CF. Correction is done in the ECU, not at the coil.

scalbert

was a base value as retreived from a ECU timing map. Years ago in GM vehicles the timing value read from the ECU was a desired value prior to knock retard being applied. I wanted to confirm or deny if this ECU was the same.

But that then begs a question, what cylinder is the timing value returned for? If your CF's are say 5 for cylinder 1 and 6 for cylinder 2 and the timing is 15 degrees, which cylinder is it for?

Honestly, I was hoping for it to be the other way around as in my example, It would say all cylinders have a starting timing value of 15 degrees. Then cylinder 1 would actually be running 10 degrees and cylinder 2 running 9 degrees after the CF's are applied.

jprice@CPS

The overall timing in block 003? It's AFTER CFs have been applied.

Chiquito Puerco

so CFs on cylinder 2 might be what you want to keep an eye on!? This stuff is way too confusing.

scalbert

It still seems unusual that CF's would be read for each cylinder but not overall timing. I guess a little math can be used to determine the overall for each cylinder if the reading is from cylinder 2.

Thanks again...