It appears as though this engine does have a timing issue. With this transducer on this particular engine, the actual valve events can be a bit hard to distinguish - the easiest event to measure is Exhaust Valve Opening - or EVO. I don't have my information systems readily in front of me, but a quick Google search led me to this document with the camshaft specifications for the 2.2 Ecotec: http://dspace.mit.edu/bitstream/handle/ ... sequence=1
. The EVO timing on this vehicle should be in the neighborhood of 49° BBDC. To calculate this on this engine first measure the total time of the engine revolution (refer to Figure 1).
This engine event took 134.0 mS or is running at 892.9 RPM. It order to calculate cam timing lets zoom in on the EVO event. (refer to Figure 2).
Here we can see that EVO took place approximately at 29.13mS after TDC or 23.48° BBDC. Obviously this is significantly off from the spec of 49° BBDC. Judging by the noise in the timing chain cover I would throw out a guess that the timing chain is loose and it jumped a tooth.
Then again it is Friday and my math might be WAY off. Thanks Paul and have a great day!
Crag Technologies, Inchttp://www.pc-oscilloscopes.com