A leakdown test must be performed on tdc compression stroke Learn how to perform the cylinder leak down test for precise engine diagnostics and troubleshooting with autozone. If that's what you did then those are terrible numbers
How To Perform A Leak Down Test - Fast & Easy - YouTube
It must have been running quite poorly.
What is a leak down test
A leak down test is a method of using compressed air and a specialized gauge set that reads differential pressure to evaluate the condition of an engine’s cylinders, pistons and rings, and valves and seats without disassembling the engine. Leak down is the percentage of compression that is lost by the engine, and every engine has some Like a compression test, a leak down test is accomplished by replacing a spark plug with the tester hose Unlike a compression test, a leak down tester has two gauges and requires a compressed air source.
