What should I be looking for when you have a code 42.....spark timing...est? help

 

https://blazerforum.com/photo_view.asp?file=0;66177
Here is the trouble tree for that code. HTH Korey

 

can anyone tell me a eaiser way, the answer I have is alot of greek.....

 

I looked at the lay out in the post. And its basic trouble shooting with yes and no response to the next point.

This is a typical layout of trouble shooting, one issue at a time. There is no easy oh its this or that.
One of the painful gremlins of trouble shooting electrical issues.
One thing at a time, and it could end up being more then just one thing.
But until you get to the first part, the next one wont show up.

 

That circuit has no real easy fix, you need to go through the process of diagnosis. Korey