Hello!  :) First off i'm new to pico scope. I'm having a blast with this tool tho  ;D. My boss has a 1976 ford f150 with a 390. I've been playing with it in my spare time. we know it needs an engine so i decided to diagnose it with our new tool. i did a cranking compression and found cylinder #7 low (see attachment 1). i comfirmed with a mechanical gauge at 60 PSI. Now why is it low???? I checked everything!! i did a running compression (attachment 2) nothing really stuck out. Engine vacuum (attachment 3) no sign of a intake valve problem. exhuast pulse (attachment 4) nothing stood out. then i hooked up to the crank case through the dipstick tube and unhooked the pcv.  ;) you can see the change after #7 fires. i confirmed this with a cylinder leak down test and a wet compression test. next time i won't have to!

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Slick ain't it  [smiley=dance.gif]

It took me about 30 seconds to diag. a broken timing belt yesterday  [smiley=devious.gif]

drdiesel1 wrote on Feb 27^th, 2012 at 6:40pm:

Slick ain't it  [smiley=dance.gif] It took me about 30 seconds to diag. a broken timing belt yesterday  [smiley=devious.gif]

Dr. diesel how did you use pico to diagnose broken timing belt?

DaveR wrote on Feb 27^th, 2012 at 9:19pm:

drdiesel1 wrote on Feb 27th, 2012 at 6:40pm: Slick ain't it  [smiley=dance.gif] It took me about 30 seconds to diag. a broken timing belt yesterday  [smiley=devious.gif] Dr. diesel how did you use pico to diagnose broken timing belt?

Relative compression test  [smiley=thumbsup2.gif]

2.0L Dodge Neon with two low holes @ 40%. Popped the rubber plug on the belt cover and voila, no cam gear drive  [smiley=woohoo.gif]

I use this feature a lot after getting use to it on my IDS.  The IDS works the same, but it ID's the cylinders for you.  It's so quick and easy to test for mechanical issue's  [smiley=dance.gif]

drdiesel1 wrote on Feb 27^th, 2012 at 11:48pm:

Relative compression test

How about this one jeep 4.7

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