Originally Posted by woodnthings

A buzz test is done with the engine off. So the dead head fuel rail does not have any effect on it. A buzz test will basically tell you if the IDM is good, the wiring from the IDM to the injector is good, or if the injector solenoid is good. Basically it is an electrical test of the system.

Like mentioned above, these tests are starting points and allow you to eliminate working components to find non-working components. Most people have a mus-conception that the tests tell you what is wrong. This is not the case and you must use the test results, methodical trouble shooting and system knowledge to investigate issues. Reading the posts on the forums helps immensely as you gain knowledge of little things like how the grey CPS effects a CCT passing or failing and other specialty tricks that we have learned over the years. The knowledge on here is something that most of the published manuals do not capture.

Originally Posted by cord812

thanks for the info...I could not find this in a book..

Originally Posted by Talyn

How I ended up over here in the SD forum though, I have no idea. haha.

Originally Posted by cord812

I watched all of the powerstrokehelp videos..

Originally Posted by guitarpicr

Does the failure on buzz test(2 & 8) have to do with dead head fuel issue(lack of return) on our trucks, or is it just the new grey cps causing the issue ?