injector buzz test troubleshooting

[hotairgypsy]

so I am trying to figure out if i have an injector problem so i ran two different tests....I didnt plug my truck in overnight and did the first test this morning around 9am. overnight temps were in the teens and temp at test time was about 32 degrees. here is a video of the test.

You Tube

You Tube

then i did my things today and just got home around 3pm...truck nice and hot. Ran the test again but while doing the first test a car drove by so i ran it again so you could hear it clearing. here is the video for this test.

buzztest56degreeshot - YouTube

buzztest56degreeshot - YouTube

so my question is what am i to take from the sound dif from the morning version the afternoon.

[dentexpowerstroke]

I may be missing something but I don't hear any issue.

[hotairgypsy]

tough to capture on video...there is a volume level difference from the morning to the afternoon. They are not as loud in the morning as they where in the afternoon. maybe it is the cold but do not know what that means. I dont know if the sound should be the same no matter when the test is done or of the engine is warmed up