Realative compression testing DC leads

[Dr Dave]

Does anyone do relative compression testing with the Dc batery leads , I swa a nice video on it and I did it with the settings he used . 200mv ac coupling filter and 1 sec time . I didnt look like a pattern that I could read until I messed around with the time and voltage scale . Is there a certian 1 setting fits all for this test ? Or is all engines different . This was a 2016 3.6 town& country. ,I know amp clamp is better but I always have trouble get around wires and setting w/ that 2 I just want a quick way to know if my #2 has low compression.i ALSO TRIED ON A 4.3 06 TRUCK WITH SAME SETTINGS AND IT WAS SO BUNCHED UP I cant tell whats what . Whats working for you guys ?

[Steve6911]

Dave

I don't do the test at the battery, I do it at the DLC with a Breakout box. You should have similar results. On post 7 I have it set up to be easy to read.

http://productforum.autorepairdata.com/forum/showthread.php?t=12281

[BRIAN617]

Try 1 volt DC scale and couple AC with 5 second sweep +or - a on the sweep to get all cylinders in view. Can also use an injector or coil pack trace to identify cylinder.

I also use DLC break out box. OTC 3415

[diagtech5221]

Relative compression testing

Ive tested at both the battery and the DLC with a breakout box with similar results.. I usually do 500mv with ac coupling on a 2 sec sweep