My first leak down test, please HELP me diagnose results
#1
My first leak down test, please HELP me diagnose results
In short, I did warm compression test on my 383ci and now, motor off the car, I did my first ever leak down test, and the results were terrible.
On cold engine, all 4 driver-side cylinders (did have time only for driver side) show between 55% and up to 70% leakage. I only hear sound coming from PCV (perhaps there was some from the valves but very minimal if any).
Test done with harbour freight leak down tester (only without label):
What am I doing wrong? Compression test (warm) showed around 145-150 psi on all cylinders so I'm confused
On cold engine, all 4 driver-side cylinders (did have time only for driver side) show between 55% and up to 70% leakage. I only hear sound coming from PCV (perhaps there was some from the valves but very minimal if any).
Test done with harbour freight leak down tester (only without label):
What am I doing wrong? Compression test (warm) showed around 145-150 psi on all cylinders so I'm confused
#4
On The Tree
Join Date: Jul 2013
Location: Augusta, GA
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I can tell you that the Harbor Freight leak down tester has horrible gauges. They are very inaccurate, replace the gauges with good ones from Northern Tool and then redo it. Do some research on it and you will see. Aside from that, if you have your air pressure on the compressor up too high it will leak out the crankcase.