A duh... Moment, Pinging from engine (predetonation?) Options

[Dtjaden]

I've been working the last few days getting my car ready for the WCR after it has had a few months winter rest. Some background: the engine is a 2056 with Megasquirt engine management, ignition and fuel injection.

Just before I put it to bed for the winter installed a cam position sensor, thanks to Mario at the Dub Shop. With the cam sensor I changed the ECU from semi-sequential FI to sequential and ignition from wasted spark to fully sequential.

Today during a short drive I noticed engine was pinging under load. I tried backing of the advance a few degrees but that did not eliminate the problem. So the next step was to check the timing. I have an Innova variable timing light and it works correctly with wasted spark by setting the cylinder count to 2.

Sitting here with a glass of wine (IMG:style_emoticons/default/beer3.gif) I just realized that the 2 cylinder setting on the timing light would result in the actual advance being twice as much as I thought...duh.

I'll be back at it tomorrow to correctly set the timing and hopefully eliminate the engine's pinging.